NAD 302综合扩大机

合集下载

NAD C 298 立体声功率放大器中文用户手册

®C 298立体声功率放大器用户手册• 阅读说明书- 在使用本产品前必须阅读所有的安全和操作说明书。

• 保留说明书- 安全和使用说明书应妥善保管以备后用。

• 注意警告- 本产品和使用说明书中标识的所有警告应予遵守。

• 遵照说明- 所有的操作和使用说明应予遵守。

• 清洁- 请在清洁本产品前将电源插头从墙上的电源插座上拔下。

请勿使用液体清洗剂或喷雾清洗剂。

请使用干布进行清洁。

• 附件- 为防止发生危险，请勿使用未经本产品生产商推荐的配件。

• 水源与潮湿- 请勿在水源附近使用本产品，如浴缸、洗脸盆、厨房水池、洗衣缸、潮湿的地下室、或靠近游泳池及其它类似的场所。

• 配件- 请勿将本产品放置在不稳定的推车、支架、三脚凳、托架或桌子上，因为如本产品跌落，有严重伤害儿童或成人并严重损坏本产品之虞。

请只使用由生产商推荐使用或跟本产品出售的推车、支架、三脚凳、托架或桌子。

将本产品安装在墙上或天花板时须遵照生产商之使用说明进行，并且须使用生产商推荐的安装配件。

• 推车- 用推车运载本产品的时候需要小心。

如疾速停下、过分用力和不平的地面都可能导致车载的本产品倾覆。

• 通风- 本产品机箱上的狭槽和开口是供通风之用，为确保本产品可靠操作以及防止过热而设置的。

千万不能堵塞或覆盖这些开口。

绝不能将本产品放在床、沙发、毯子等等其材料会堵塞这些开口的软物体上。

除非有足够的通风或遵照了生产商指示，不得将本产品放在书橱或机架等封闭的装置内。

• 电源- 本产品使用的电源必须是标签上所示的电源类型，并连接到带有保护接地连接的电源插座。

如您不清楚您家里使用什么电源，请咨询您的产品经销商或当地电力公司。

• 电源线保护- 电源线应该合理排布，使其不易被踩踏或被物品压着或夹着，特别要注意与插头接合部位、简便插座、以及在本产品连接处的电线。

• 电源插头- 在电源插头或电器耦合器被用作断开设备的情况下，断开设备应确保易于操作。

• 室外天线接地- 如果本产品连接外部天线或有线电视系统，为了保护本产品不受电压冲击和静电积集的损坏，请确保天线或有线电视系统已接地。

NAD3020测评

D3020试听体感作为国际知名音质品牌，凭借平民的价格与理想的音质，NAD在众多玩家心中建立起极高的品牌认知——平民中的劳斯莱利。

此次试听正是NAD在2013年推出的新一代综合放大器D3020——小身材提供大功率。

D3020刚刚推出就获得了WHATHIFI5星奖，与其时尚的外观，高性价比的功率与性能不可分割，是发烧友们大爱的入门级别产品。

1 外观：2013年，NAD推出D3020这款高设计感的产品，不仅延续了3020的所有优点，更是在外观设计上进行重大突破，不再是传统音响外形设计，改走时尚路线使得此产品更加吸引年轻人。

2 技术：（1）功能：D3020具有APTX蓝牙接收功能，可完美接驳手机、平板电脑、PC电脑、笔记本电脑等设备，蓝牙功能为用户带来更大的便利，但音质也会相对的差一些。

D3020也提供非同步USB传输，连接电脑更方便，同时音质也会更好，可以放到96k的无损音频。

当然，D3020也有其他的数位输入选项，包含RCA同轴、光纤等。

D3020甚至提供主动式超低音连接功能、独立的耳机扩大器，以及遥控功能，一应俱全。

（2）性能：众所周知，振幅越大失真就越大，D3020的振幅控制在0.03以内，以保证音质的高保真级别。

只要不堵塞到散热孔，即使是夏天使用D3020，也不会有发热的现象。

D3020属于音频解码器，数据解码在D3020中进行，音源从属于功放，需要另外配备音箱，如对低音需求较高，可以再配备一个低音炮。

（3）功率：D3020的功率是30W，适合在12平米左右的近场聆听。

可以加个脚架放在书房中使用，更多的年轻人购买是图D3020方便小巧，同样体积的产品中，D3020的音质是非常棒的！因此搭配的音箱越好，越能够体现D3020的优点。

我们使用双5.25寸的落地音箱连接D3020，试听交响乐《梁祝》，D3020推起来毫不吃力，各种音色以及各个声部的体现及还原度都非常高。

真正在家使用时，找一对声音饱满温暖一些的音箱，使用绰绰有余。

NAD 302综合扩大机

NAD 302综合扩大机
佚名
【期刊名称】《视听技术》
【年(卷),期】1994(000)003
【摘要】<正> NAD的扩大机在台湾被视为入门级产品,但国外名气可大得很。

十几年前一部3020曾经在英美两国横扫天下,TAS的主编HP盛许3020的前级部分素质超群,足以和任何天价级的后级相匹配;英国的Hi-Fi Choice也颁给它最佳音响器材大奖,他们一致认为NAD的产品价格低廉,音色正确,推助力十足而且善于表达音乐的感情与色彩。

302综合扩大机承继3020的优良设计,但是功率加大为二十五瓦,适合更多人使用。

302综合扩大机依然使用了NAD专利的气囊功率(Power Envelope)与软性削峰(Soft
【总页数】1页(P48-48)
【正文语种】中文
【中图分类】TN912
【相关文献】
1.温文儒雅的Onix OA31——综合扩大机 [J], 朱耀明
2.Onix OA31——综合扩大机 [J],
3.音乐之旅上市多功能综合扩大机ECI 6DS [J],
4.综合工业集团是扩大机电出口的必然趋势 [J], 孙秋昌
5.德国Burmester082综合扩大机上市 [J],
因版权原因，仅展示原文概要，查看原文内容请购买。

视听方案

目录一、概述二、功能设计及其标准三、建声、采光要求和建议四、系统设计五、主要设备的选用六、电力电源系统要求七、质量保证八、视听器材配置预算附录一、系统方框图二、设备布置图三、EASE声场设计图四、装潢视听要求庆峰会议室视听工程设计方案一、概述本工程为会议室视听系统。

其设计原则是：在确保功能完善、设计先进和品质可靠的前提下力求高的性能价格比。

1、建筑、装潢的建声、采光设计人的听觉和视觉必须通过空间传播。

因此，为了取得优良的视听效果，在建筑、装潢中应充分考虑降噪、隔声、吸声、扩散和采光等诸多因素。

如吸声不够使混响时间过长，必然影响声音的清晰度；但吸声过度也会使声音缺乏生气；如果有较强的光线照在投影屏幕上，亮度再高的投影机也不可能很好地显示出图像的暗部信息。

如建筑已定型，只有通过装潢进行必要的声学处理来提高各场所的建声、采光性能。

因此，在装潢设计时应有视听工程设计人员参与，以便相互协调，才能取得理想的视听效果。

2、科学、合理的系统设计和选材视听系统应根据相关标准[注]，按照声学、光学原理，采用国际公认的软件（如EASE音响设计软件等）进行计算机辅助设计，不能单凭“经验”；系统设计和选材要依据使用要求合理配置，不必追求华而不实的“档次”。

3、认真、细致的施工视听系统是由多台电子设备组成的，它们之间必须用音、视频或数据线相联接。

由于大部分设备是“串联”的，只要串联环节中任何一处有故障，系统就不能正常工作。

因此，每一根线的每一个接头都必需认真对待。

此外，吊装设备更要认真，以确保安全。

4、仪器和听音相结合调试视听系统必须通过专用测试仪器调试，并由接受过音质评价专业训练的技术人员实际听音进行适当地修正，才能达到标准要求和预期效果，二者缺一不可。

那种说“音响是听的，只要耳朵听就能调试好”的说法是不科学的。

5、熟练的调音人员调试好的大部分设备在使用中不应再随意调动，但仍有部分操作必须在现场调控。

因此，在设备的安装、调试过程中就应有今后的操作[注] GB50371-2006 厅堂扩声系统设计规范JGJ/T16-92 民用建筑设计规范――扩声与同声传译人员参与，以便熟悉设备、接受培训，并不是将来找一个持有“音响师培训班”结业证的人员就能正确、熟练地操作。

全固态发射机末级功放管及其应用论述

全固态发射机末级功放管及其应用论述作者：***来源：《卫星电视与宽带多媒体》2021年第12期【摘要】本文简要论述了全固态发射机末级功放管结构、分类、性能以及实际中的应用，了解掌握功放管的存放测量和更换方法，减少末机功率放大器故障率，进一步提高全固态发射机的维护水平。

【关键词】场效应晶体管;功放管;多赫蒂功率放大器;静电感应电压中图分类号：TN929 文献标识码：A DOI：10.12246/j.issn.1673-0348.2021.12.014随着高频大功率场效应晶体管研发制造技术的不断进步和广泛应用，广播电视发射机生产厂家开发研制出了各种功率等级的全固态发射机。

以其效能高、工作电压低、性能稳定、故障率低、体积小、运维费用低、维护省时方便的特点得到了广泛的使用。

在日常的使用维护中，全固态发射机末级功率放大器是发射机的核心部件，以其自身特性，相对故障多，维修量大，而末级功率放大管即高频大功率场效应晶体管是功率放大器的关键核心器件，是故障的多发部位，对其熟悉掌握，有利于发射机的使用和维护。

1. 场效应晶体管结构、分类和性能场效应晶体管按其构造分为结型场效应晶体管（JFET）和绝缘栅型场效应晶体管（IGFET），按沟道材料分可分为N沟道型和P沟道型。

从导电方式来分，又可分为耗尽型和增强型。

全固态发射机功率放大器所用的都是绝缘栅增强型N沟道场效应晶体管。

绝缘栅型场效应管是指金属-氧化物-半导体场效应晶体管MOSEFT，即MOS管，其从制造工艺和不同应用上又可分成普通CMOS管、UMOS管、TMOS管、VMOS管、DMOS管、LDMOS管等系列，在广播电视发射机功放中主要应用的是早期的大功率垂直扩散VMOSFET 管和新型超耐用型更适合数字发射机末级功放使用的横向扩散LDMOSFET管，都是根据实际应用由普通MOS管发展变化的改进型。

这是绝缘栅增强型N沟道场效应管结构图和电路符号如图1：VMOSFET场效应管全称是垂直扩散型金属氧化物场效应晶体管，金属栅极采用V型槽结构，简称VMOS管或功率场效应管，普通MOSFET场效应管的栅极、漏极和源极大致处于同一水平面的基板芯片上，其工作电流是按水平方向流动的。

一款热门扩音机HAPY TONG(哈顿)3020、3225PE合并放大器

梢进行衔接从而使整机达分体机效果拔开权梢就变成了前后级各自独立的放大器在应用上方便了许多
。 , 。
,
,
一款热门扩音机
哈顿
户
、
该放大器的功效输出部分属商电流输出形式用于驱动扬声器
, , 。
许多喇叭在工作时阻抗并不是恒定的变化
,
放大器虽然是一款
。
将一些价钱贵几倍的名机也比下去
,
对于预
302。
、
前后级合并式扩音机但从整机的结构上来看也可以把它当做一款分体机来对待因为
它已在电路上把前置放大部分与后级功率放
算有限而品味又不俗的发烧友哈顿
,
,
该机可从容地推动低至
,
Zn
。
的扬声器工作
,
这中间选出一款能完美表达音乐的真谛靓声又耐用且价钱又低廉真正称心如意的产品也并非易事
, 。
而表现上全无失真及限幅
,
超低噪声低阻抗
odB
,
的线路设计使整机的信噪比可达 1 0 上而整机的失真度低于万分之三该机还为
。
In
,
,
此时若放大器不能快
,
,
平心而论哈顿
,
,
3020

维科特机电 AM322042H 产品说明书

AM322042H产品说明书在86及110、130混合式步进电机的应用中(主要需求点为900RPM以内，高转矩、高响应、高性价比的定位控制，或者变频调速控制)，三相混合式步进电机应用最为广泛。

AM322042H以各行业客户对高压型3相步进电机驱动器的需求为目标(主要针对86及110的电机驱动应用)，以行业应用经验为基础，以为客户提供高性价比、高稳定性的产品为宗旨。

整套控制方案在充分吸收和掌握国外先进技术的基础上进行深入优化和提炼而成。

硬件设计上充分考虑强弱电隔离、输入信号兼容、关键物料选用国际知名厂家经典、成熟的元器件；软件上采用改进型的矢量控制技术及其快速算法，并具备自测试运行、单双脉冲模式设置、多重保护等功能。

特点Ø单电源输入，电压范围：交流AC110-240V；Ø驱动电流从有效值1.2A/相到4.2A/相分16档可调；Ø16档细分配置,最高分辨率60000步/转；细分配置小于等于2000步/转时采用微细分控制方式；Ø最高响应频率可达200KHz;Ø相位记忆功能：断电时能自动记忆电机转子位置；Ø保护功能：过热保护/过流保护、相间短路保护、断线保护、过压保护；Ø自动半流：输入脉冲脉冲停止超过100ms时，电流自动减半，减少电机发热；Ø全隔离：信号输入输出隔离；强弱电隔离(pwm控制信号及电流采样均隔离)；Ø5V/24V信号输入兼容设计；Ø控制模式可选：脉冲/方向模式；或者双脉冲输入模式；Ø自测试功能：无需外界脉冲信号即可驱动电机以30转/分钟的速度转动；Ø体积为178*109*68 (mm^3)，推荐安装空间至少为200*160*90 (mm^3)；净重：1kg(加包装箱1.3kg)；颜色：白色；Ø采用工业级芯片设计，运行环境温度：－25゜～＋60゜(0゜以下不结冰)；Ø采用矢量控制及微细分控制技术,在运行平稳性、噪音、震动、发热等方面较传统驱动器均有较大的提升；电流设定驱动器工作电流有效值IM(以下简称IM)由D1-D4拨码开关设定(注：工作电流为正常运行时的电流有效值给定，抱轴时的电流则为对应工作电流的50％，简称自动半流。

博根MBS1000A型桌面扩音器说明书

Model MBS1000ADesktopPaging MicrophoneDESCRIPTIONThe Bogen Model MBS1000A is a dual-impedance,uni-directional,dynamic desktop microphone with a rubberized finish for all industri-al and commercial public address and paging applications.TheMBS1000A has a bottom-mounted slide switch for low- or high-impedance selection.The wide band frequency response is smooth andpeak free,thereby providing a natural,highly-intelligible sound.The microphone output provides a normally open switch closure pairthat can be used to operate external equipment.When the micro-phone is activated using either the push-to-talk or lift-to-talk functions,the provided contact closes.The push-to-talk actuator bar includes alocking feature to allow the mic to remain active for extended periods.The lift-to-talk feature can be enabled or disabled using a bottom-mounted selector switch.Four molded,non-skid,non-marring,and permanently resilient "feet"are located under the cast base.SPECIFICA TIONSElement:DynamicPolar Pattern:Uni-directionalFrequency Response:45 to 15,000 HzOutput:Hi-Z:-52 dB (0 dB = 1 volt/microbar)Lo-Z:-72 dB (0 dB = 1 volt/microbar)Impedance:Hi-Z:50,000 ohms,matches 50,000 ohmsor greaterLo-Z:500 ohms,matches 125 to 1000 ohmsSwitch:Push-to-talk and push-to-lockCable:7-feet of four-conductor,two-shielded cable(mic leads shielded,contacts not shielded)Dimensions:4-3/8" W x 9-3/8" H x 5-7/8" DProduct Weight:1lb.Finish:Black rubberized finish with die cast baseIMPEDANCEThe Bogen Model MBS1000A is a dual-impedance microphone.Thehigh-impedance position is 50,000 ohms unbalanced and the low-impedance is 500 ohms balanced.The low-impedance position is rec-ommended for long cable length requirements.Cable lengths of 100feet or more can be used in this position without loss of level or dete-rioration of high frequency response.Printed in Korea.0302© 2003 Bogen Communications,Inc.54-5901-02ASpecifications subject to change without notice.50 Spring Street,Ramsey,NJ 07446,U.S.A.201-934-8500;Fax:201-934-9832E-mail:**************/Web Site:SELECTORS AND SWITCHESCABLE END CONNECTIONS HI IMPEDANCE:Connect the red lead to an unbalanced mic input,the black lead and shield to ground,and the white and green to external equipment (if applicable).LO IMPEDANCE:Connect cable leads,red and black,to a balanced mic input;shield to ground;and white and green to external equipment (if applicable)PHASINGPositive pressure (movement of diaphragm inward) will generate a positive voltage on the red cable lead with respect to the black lead.CABLE CONNECTIONSFREQUENCY RESPONSE GRAPH。

天龙A3.2综合放大器使用说明书

A3.2综合放大器INTEGRATED AMPLIFIER2安全指示1. 不可自行开启本机进行维修或改造！本产品不设有用户自行检修的零件，本机的维修须请具备专业资格的人员进行。

开启机器及随意改造内部电路会令检修人员难以维修本机，而且会对机器造成性能或质量的影响。

3. 设备不应遭受水滴或水溅，机器上不应放置诸如花瓶一类的装满液体的物品。

7. 用电源插头和器具耦合器作为断开装置，断开装置应当保持能方便地操作。

6. 设备应当连接到带保护接地连接的电网电源输出插座上。

5. 设备上不要放置裸露的火焰源，如点燃的蜡烛。

4. 通风孔不要覆盖诸如报纸、桌布和窗帘等物品而防碍通风。

8. 必须遵照电池废弃的相关地方条例来废弃旧电池。

2. 为了充分通风，设备背面和两侧应最少保留10cm，顶部应最少保留20cm的空间。

9. 仅适用于海拔2000m以下地区安全使用，标志见图1。

10. 仅适用于非热带气候条件下安全使用，标志见图2。

图1图2执行标准：GB8898-2011; GB /T13837-2012安全注意事项4. 遥控接收窗口5. 多功能显示窗6. 音量减小键1. 待机开关键2. 输入向后选择键3. 输入向前选择键7. 音量增加键8. 静音键9. 耳机输出接口一. 1. 蓝牙天线2. USB DAC 数字信号输入接口3. 光纤数字信号输入接口4. 右声道扬声器输出接口5. XLR 信号输入接口6. 模式选择开关 (置于STEREO )13. DVD 信号输入接口14. AUX 信号输入接口15. BYPASS 直通信号输入接口16. PRE 前级信号输出接口17. 左声道扬声器输出接口7. 增益选择开关8. 接地端子9. 交流电源输入插座 (带保险管)10. 总电源开关11. PHONO 唱机信号输入接口12. CD 信号输入接口部件名称3二. 1. AUX信号输入接口2. DVD信号输入接口3. CD信号输入接口4. PHONO唱机信号输入接口9. 接地端子10. 交流电源输入插座 (带保险管)11. 总电源开关12. 扬声器输出接口“ + ”极5. XLR 信号输入接口6. 扬声器输出接口“ - ”极7. 模式选择开关 (置于MONO INT )8. 增益选择开关三. 1. RCA 信号输入接口2. XLR 信号输入接口3. 扬声器输出接口“ - ”极7. 总电源开关8. 扬声器输出接口“ + ”极4. 模式选择开关 (置于MONO POWER )5. 输入源选择开关6. 交流电源输入插座 (带保险管)4注：1. 遥控器有效距离不大于10米，遥控夹角不大于30度。

ad8302斜率电压

ad8302斜率电压AD8302是一种广泛应用于射频（射频）测量领域的斜率电压放大器。

斜率电压是指输入信号频率变化时，AD8302输出电压的变化率。

本文将从AD8302斜率电压的原理、特点和应用方面进行介绍。

一、原理AD8302是一款精密的斜率电压放大器，其原理基于射频功率检测技术。

它采用了一个复杂的电路结构，能够将输入信号的相位差转换为电压输出。

当输入信号频率变化时，AD8302能够精确测量出其频率变化率，并将其转换为相应的电压输出。

二、特点1. 宽频带范围：AD8302的工作频率范围广泛，可覆盖从DC到2.7GHz的射频信号。

2. 高动态范围：AD8302具有高达92dB的动态范围，可以测量非常小的输入信号功率。

3. 高精度和稳定性：AD8302具有高精度和稳定性，能够提供可靠的测量结果。

4. 低功耗：AD8302的功耗非常低，适合电池供电和便携式设备应用。

三、应用1. 射频功率测量：AD8302可用于测量射频信号的功率，广泛应用于通信系统、雷达系统等领域。

2. 频率测量：由于AD8302能够测量频率变化率，因此可以用于频率测量，例如频率合成器的校准。

3. 相位测量：AD8302的原理是将相位差转换为电压输出，因此可以用于相位测量，例如相位比较器的校准。

4. 电压控制振荡器（VCO）控制：AD8302可以用于VCO的频率调节和控制，实现频率稳定。

总结：AD8302作为一种斜率电压放大器，在射频测量领域有着广泛的应用。

其原理基于射频功率检测技术，能够精确测量输入信号的频率变化率，并将其转换为电压输出。

AD8302具有宽频带范围、高动态范围、高精度和稳定性以及低功耗等特点，适用于射频功率测量、频率测量、相位测量和VCO控制等应用。

通过使用AD8302，可以实现准确、稳定的射频测量和控制，为射频系统的设计和优化提供了有效的工具。

HIFI NAD的历史

转载：NAD历史概述：1972-2004发布: 2011-1-14 23:36 | 作者: 君子| 来源: 中国音响NAD历史概述：1972-2004作者BEE1972年，一群顶尖的欧洲HI Fl设备销售商在德国慕尼黑的一间酒店客房里召开了一次会议。

他们中的每一位都在各自的国内建立起了强有力的市场，销售多个主要的HI Fl品牌，并且都是AR (Acoustic Research）的全国销售商。

马丁•伯里斯（Martin Borish）当时主持AR的国际营销和关于欧洲供货厂家的业务。

他是这次会议的主要人物。

会议日程安排简单明了：1.创造一个全新的HI Fl设备品牌，一套能与AR音响组合搭配完美和谐的产品。

2.在日本寻找最低生产成本的同时，保持新品牌的联合所有和控制形式，包括产品设计和销售。

这次会议创立了NAD（New Acoustic Dimension），并计划建立一条电子产品生产线，其最初的产品是日本福斯特(Foster)公司制造的合并式放大器，NAD model 60。

技术背景与早期影响：1972年的HI Fl世界1972年，世界上仅有的高品质音乐源信号是开盘式磁带录音、FM广播和密纹唱片录音。

所有不完美的媒介都有着极大差异的复制效果，非常依赖于繁复的模拟转换来保持着最微弱的细节。

然而，所有的器材，都能发挥其功能的极至，能够将高保真声音效果还原得令人满意的近乎真实。

优质的磁带录音依然昂贵，而预先录制的开盘式磁带录音从未作为音乐媒体来应用。

专业的磁带录音机已经相当先进。

大多数60年代录制的最好的录音作品都是Ampex 3轨道1/2英寸的磁带录音机，用15或30ips录制的，甚至可以媲美CD的表现，并且还未使用减少噪音的处理。

所有的电子管设备，超载额较高，即使达到2%的失真也能保持音效柔和。

从“噪音平台”到可听失真音之间的动态变化区域，很好地控制在70dB，频响起伏微乎其微。

60年代摇滚音乐和其他流行音乐盛行，这极大地推动了多轨道录音机应运而生。

湖山深圳2010年产品介绍

MIC输入灵敏度： 15mv
输入阻抗：
47K欧姆
信噪比：
>76dB(A计权)
最大输出功率： 300W + 300W（4欧姆） 200W+200W(8欧姆)
谐波失真：
<0.1% @1KHz/40v
线路输入频率响应： 20Hz-20Kz 不均匀度≤3dB
主声道低音调节范围： ±12dB（100Hz）
▪ 极低的本底噪声
卡拉OK数码前级 DE-501A
主要指标：
音乐部分
信噪比（SNR）: >95dB(直通，变调关闭)
频率响应： 20Hz-20KHz ± 0.5dB
失真（THD）： 0.01% 20Hz-20KHz
输入灵敏度/阻抗： 150mv/4.7K欧姆
频率响应：
20Hz-20KHz ± 0.5dB
每个输入、输出通道多个频率、Q值、均衡增益可调的参量均衡器
失真（THD）<0.05%, 20Hz-20KHz
每个输入/输出通道具有独立的最大为630ms的延时调整（延时调整步距
@+10dBu
最大为21us），延时单位分别能以毫秒，米，英尺来调整
额定输入电平： 0dB
每个输出通道具有相位反转控制，方便分频应用时调整音箱相位
数字功放
专业音箱DK2512
▪ 主要特点： ▪ 专为KTV演唱设计，音质甜美柔和 ▪ 夹板箱体，结实轻巧，吊挂方便
10dB）
▪ 超高灵敏度单元，让歌者轻松自如 ▪ 大磁钢喇叭低音结实有力，让舞者激情澎湃 ▪ 高保真H高保真Hi-Fi效果，让听者久听不累
标称阻抗：8欧姆
主要指标：结构：两分频低音反射式结构频率响应：50Hz-20Kz（-

NAD功放评测和NAD 304合并式功放评测合集

出一个9.9新的NAD304功放得过欧洲大奖和无数好评的NAD304,9.9成新机,连新机的清香味道都还在,所有原厂包装和说明书(全洋文)都在`使用时间不超过三小时,现在包装好放着,1650元包华宇,图梢后上~~QQ:511317238NAD发明专利柔性剪峰SoftClipping电路革命性令纯电晶体制作扩音机散溢出叫发烧友如痴如醉的甜美而柔媚之天文数字价位胆机才有的风韵!当年what hi-fi 250英镑级别的5星功放。

“柔性剪峰”(Soft Clipping)是一个相当有用的功能，您可以选择开启或关闭此功能。

一般人都有这样的经验：如果功放音量开得比较大，或音乐电平起伏较大，功放的输出超过其额定功率，会产生削波失真，声音变紧、生硬、失真。

而NAD的Soft Clipping电路正是通过适当减小输出功率等办法来保持波形的完整，减少失真。

如果只以适中功率使用NAD功放，则可关闭此功能；反之也可以开启，既可保护音箱，又可保护自己的耳朵。

“气囊功率”(Power Drive)也是NAD的特色线路，这是NAD于上世纪80年代和90年代著名的Power Envelope电路技术的进一步发展和改进，它能在瞬间高输出的情况下提供更强大的电源供给，使功放的大功率输出更稳定，驱动力更强，低频更出色。

Power Drive电路与Power Envelope电路相比，效果更为显著，同时整体失真更小。

NAD 304 - Best SS amp ever?I'm being silly, of course, but my experience with this integrated amp has been really baffling. I'll give a brief historical outlineI. Bought one in 1994 on the strength of Corey Greenberg's utterly excited "this is real high end audio for $300!" review in Stereophile (btw, this review isn't anywhere online that I can find). After owing it for a few days, the skeptical retailer asked me if it sounded as "glorious" touted? Well, powering my lil' Dahlquist DQ-16s, the answer was YES!II. In 1995, something went wrong and I needed a repair. That was the old "green circuit board" version. Borrowed a Quad Amp and Preamp...maybe a 405 with matching preamp? Sounded big and warm.III. Got the NAD 304 back with new Blue circuit board. Sounded way bigger, more dynamic, and clearer than the Quad set-up. Loved it! had to sell it off later that year to help with some debt.IV. Bought one in 2008 for $175. I'm using it to power Triangle Zerius 202s.I know, not the first combo you'd imagine, right? Sounds very clean and not lacking tonally, but now I'm looking for more dimensionality and palpable presence. I have tried using more powerful NAD amps, a high-powered Adcom, and I'm currently trying a Parasound HCA-750A. Everything sounds...ordinary. To be fair, the Parasound has warmed up and is starting to sound pretty good, but it doesn't exactly blow the 304 away.Am I going to going to have to look at much more expensive gear? Tubes, maybe? Some of the amps I've tried have been very affordable, but the Quad and theAdcom were kind of ridiculously high-priced IMO, and the 304 was hands-down the winner in those shootouts.Has anyone else had a similar experience - and if so, what did you finally choose upgrade with?Joelv(System | Threads | Answers | This Thread)08-28-08Responses (1-13 of 13)Click title to read one, or click date to read all below it.08-31-08To rephrase the question, have you ever upgraded from an n ...Joelv09-03-08I am using one with a video system in the livingroom-tryed ... Dred09-03-08Right on, dred, thanks for sharing your experience! the304 ...Joelv10-10-08Nad amps are pretty good deal for the money and i agreewith ... Hieule510-10-08I owned a 304 for quite a few years, then passed it downto ... Kbarkamian10-13-08: JoelvYou know, I'm using the 304 as a pre-amp now. After a few months with my Triangles, I am hearing the 304's limitations... namely rolled off extreme highs and lows. Shortly after writing this, I spent some serious listening time with the Parasound amp and realized that it was pretty great, if a little "hard" sounding in my system.I'm curious about the 315Bee and the 325Bee as well. I assumed they wouldbe only marginal improvements, but a remote control would be awesome.I'm curious about the B&K ST-140 (the older, 70WPC one), the ST-120, and the newest Parasound Zamp. I've also heard some great things about the OnkyoA9555 Class D integrated.Finally, I take no offense at anyone's opinions about the 304 (or any of my gear) for that matter. Taste is taste, and good is good. Cheers!Joelv(System | Threads | Answers | This Thread)10-13-08: KijankiJoelv - my brother has NAD (I don't remember model #) and he replaced stock jumpers (thick U shaped bars) between pre and power amp with Audioquest Python jumpers (6" $25). It opened rolled off top end.Kijanki(System | Threads | Answers | This Thread)10-13-08: MapmanWhat do you use for source units? Cd/digital or phono or both?Mapman(System | Reviews | Threads | Answers | This Thread)10-13-08: KbarkamianI'm not sure if the source question was directed to me, but I'll chime in...Original source I used was a Playstation1 while I saved money. Upgraded that to an NAD 523 changer. Huge improvement. From the 523 to a Rega Apollo. Even bigger improvement. The 304 was good enough to show definite differences each time. Even non-hifi guys heard big differences.Original turntable was a Technics SL-BD2 with Grado Blue. Upgraded that to a Pro-Ject 1Xpression. Added a Dynavector 10x5 and Speed Box. The only piece I didn't hear through the 304 at one point or another was the 10x5.Regarding the 304 to 320BEE...Everything is improved. Lows, mids, highs, noise. etc. Not a night and day difference IMO, but an overall improvement. You lose a phono stage. Gain a remote and 15 solid watts. Those 15 watts may seem insignificant on paper, but they become very obvious when driving speakers louder, in a larger room, more difficult speakers, etc.I thought the price was well worth it for the 320BEE. I haven't heard the 315BEE. I heard very little difference between the 320BEE and 325BEE. Personally, I'd save a few bucks and get the right 320BEE over a 325BEE.If no good ones were available for the right price, then get a 325BEE.JRKbarkamian(Answers | This Thread)10-18-08: JoelvMy sources are: SONY DVP-NS715P as a CD / DVD player, Technics SL1200 with KAB Fluid damper and Cardas arm rewire w/several cartridges :)I replaced the jumpers with 20" of Kimber PBJ which is different, though not an obvious improvement.I can also say that the phono stage on the 304 is not quite as robust sounding as the one on the 7100 (at twice the retail cost)... which, while I'm at it, has anyone here used the Bellari phono stage? $250 and Stereophile Class B rating from Michael Fremer... is it really that good? I'm skeptical.I miss Lonnie Brownell's reviews. I found that his and, previously, Corey Greenberg's reviews were aligned with my own tastes more than anyone. I also have a soft spot for Sam Tellig.. but I'm way off topic here. :)I'm unemployed, so no new gear for me for awhile. Anyone need a recording engineer?-JoelJoelv(System | Threads | Answers | This Thread)10-19-08: PhasecorrectThe Nad 3155 intergrated is very highly regarded...and more difficult to find(maybe ebay but thats a whole other post)...at any rate...NAD amps are phenominal value for the money...they sound big, bold, and very in control...much more like a high powered hi-end amp...I also have heard nightmere stories regarding QC issues concerning their CDPs...justmy .o2....Phasecorrect(Reviews | Threads | Answers | This Thread)04-06-09: JoelvAn update: My stalwart 304 has developed some problems -flakiness/fuzzyness/intermittent cutting out in the right channel. I understand capacitors and solder joints are usually to blame, so I'm going to have it repaired.In its stead, I'm using my new Trends TA-10.1, touted as 6 Watts ofgiant-killing, audiophile magic.So far, I'm disappointed, but I am waiting for the batteries to discharge and recharge so I can try that option.Joelv(System | Threads | Answers | This Thread)04-13-09: JoelvOK I just have to update this.I now feel that the Trends TA10.1 is the best amplifier that I've ever owned. It's in another league, completely, from the NAD. Big sound stage, stable, big images, gobs of detail.I'm out of town but will likely post a review of this when I'm back. If anyone wants to discuss how awesome the Trends TA 10.1 is, feel free to e-mail. I'm thrilled!Anubis,I've read a review somewhere on the net, but can't remember where. It was by one of the major magazines, maybe Stereophile?I used to own the 304. It's currently anchoring my 14 year old brother's Xbox/iPod/Insignia speaker system (the Insignias that everyone was raving about).I replaced the 304 with a 320BEE. My only reason was kind of stupid - I wanted a remote control. If this helps, tonally they sound very similar. The 320BEE is a little more refined, but the 304 seems to have a flatter frequency response to my ears.The phono input is very good. To be honest, I thought it was somewhat better than the NAD PP2 phono stage.I've hooked up a lot of different speakers - from totaly garbage 'White Van' speakers to some power hungry NHT towers. While I was in college and a few years afterward, a lot of friends used my 304 as a reference amp, hence the multitude of speakers tried. It never had a problem with any speaker attached as long as I didn't try to make it do impossible things.Depending on your room size and speaker efficiency, it may or may not have enough power. In an average sized room, I had no problems driving my PSB Image T55 towers or PSB Century 500i to loud levels.Keep in mind that any 304 amp probably 15 or so years old. Depending on use or lack thereof, care taken for it, etc., your results may vary quite a bit. Mine (now mybrother's) is very well taken care of.The only fault that I've ever encountered was the solder joints for the inputs. My father being the master mechanic that he is says that they weren't soldered very well. He resoldered the phono and cd inputs for me. Never had any other problems.What else can I tell you... I'm not too sure. Feel free to ask any questions.AnubisBronze MemberUsername: AnubisBirmingham, West Midlands EnglandPost Number: 60Registered: May-06 Posted on Thursday, February 22, 2007 - 11:13 pm:Thankyou, Stu. I found that very helpful, as a matter of fact.I'm still weighing one 304 against many others, including a C357, which I simply can't afford now.There is also a 716 surround amp. I'm used to very simple, 2 channel sound. It will probably bid up to more than the deposit for a new one anyhow.Then my 'sensible voice' starts up with "get the 3155 - its got to be better than your old 3225PE..!" Not necessarily, though... Hard choice, without being able to listen.Then perhaps I could always make-do with that old 3130, I could have: �49 +postage on a 'Buy It Now'.Ah... I dunno. I've had to go away and cool off from it all. I can't decide which will be best for me. Oh for the buying power, to just walk into a showroom...The thing that turns me on, is when you find a gem; Like with my old 3020... But I've simply outgrown it's limitations.Cheers,VStu PittGold Member Username: Stu_pittIrvington, New York USAPost Number: 1584 Registered: May-05 Posted on Friday, February 23, 2007 - 01:33 pm:What do you have right now? The 3225PE I presume?If you own that and it's in operable condition, most of the ones listed will probably be a lateral move IMO.If you don't have anything right now and need a temporary band-aid, pretty much any of them will suffice, as long as they can drive your speakers. They all have the a similar house sound.The C352 would hands down be the best of the bunch IMO.If you're looking for a short term replacement and loved your 3020, the 304 will probably run closest. It'll most likely have the limitations the 3020 did. Its 35 wpc. If you need specs on any NAD gear, search around the NAD website. I believe they have old brochures with specs on PDF format in the Support section.I'll be out of town and away from the computer for a few days. If you need more help, let me know.AnubisBronze MemberUsername: AnubisBirmingham, West Midlands EnglandPost Number: 65Registered: May-06 Posted on Friday, February 23, 2007 - 03:26 pm:Yes, I have the 3225PE, which is broken. I have a 3020 standing in in the living room, but when the 3225 was operational, the 3020 was on computer/art studio duty.To be honest, Stu, your comments speak volumes to me, compared with a mere list of specs. Because most tech talk is chinese to me, I find that by reading (honest) reviews, where a tester has listened critically and mentioned both low and high points, gives me the best idea about a piece of gear.Of course, silly as it sounds, I've avoided the BEE models and I think this is down to the fact they've all too often been laid against the C357, whose general reputation is of the best NAD can provide in this price bracket.I still sometimes wonder about what a new C320 BEE would do for me, in reality. I can get this, possibly the entry level, new, for around �200.VNuckGold Member Username: NuckPost Number: 5986 Registered: Dec-04 Posted on Friday, February 23, 2007 - 07:07 pm: V, does that 320BEE come with a phono?Anubis Posted on Friday, February 23, 2007 - 10:01 pm:I'm not sure, although noticing after a certain point, NAD simply stopped putting internal phono stages into their amps, I would not beBronze MemberUsername: AnubisBirmingham, West Midlands EnglandPost Number: 66Registered: May-06 surprised to find it doesn't.Which is a shame, because the big selling factor for NAD is VFM. As the amps have become more powerful and ISC came in, they've dropped the stages.Still, I trust that they'll be worth it in many ways.VAnubisBronze Member Username: AnubisBirmingham, West Midlands EnglandPost Number: 67Registered: May-06 Posted on Friday, February 23, 2007 - 10:03 pm:Actually, damn it... I seem to recall now that it does... I'd have to check.VStu PittGold Member Username: Stu_pittIrvington, New York USAPost Number: 1585 Registered: May-05 Posted on Saturday, February 24, 2007 - 11:13 pm:None of the current NAD integrateds have an internal phono stage. They have an input called "disc," but its not a true phono input. They label it that way so you can connect an external phono stage to it. I run mine with a PP-2. It suffecient for me for now. When I re-do the system, it'll definitely be replaced.If your budget is tight, the 320BEE could be the way to go. If your budget can stretch it, the 352 is easily worth the added price. It sounds much more natural and doesn't have the frequency response bumps the 320BEE has. The 372 may be better than the 352, but if you don't need the extra power it may not be worth your time.Just some food for thought.AnubisBronze MemberUsername: AnubisBirmingham, West Midlands England Post Number: 75 Posted on Thursday, March 01, 2007 - 02:28 am:I wouldn't look at either of the BEE models, since my review sources tell me these are the entry level amps in the NAD range and therefore may be coloured slightly, to accept a cheaper range of speakers.I wouldn't consider buying a C357 new, because at it's current RRP, it's way above budget. The C352 is something of an improvement over the older C350 (more on this in a moment!) and would seem to more than adequately fulfill my requirements for neutrality, soundstaging andRegistered: May-06 bass control. Only problem is that a new one is more than I can affordright now and second hand, well - they are shooting up above mycurrent budget... So...I'm about to become the proud owner of a once award winning...C350!In very nearly mint condition, too!. Box, manual, fully workingremote.Considering I was looking for a rough patch for a broken 3225PE,along the lines of 3030 and 3130, as you might imagine, I'm veryexcited, awaiting it's arrival!VAnubisBronze MemberUsername: AnubisBirmingham, West Midlands EnglandPost Number: 76Registered: May-06 Posted on Thursday, March 01, 2007 - 02:34 am:Oh - and what I've saved, I shall put towards an outboard phono stage in future. I can wait for now, to hear my vinyl - while I use CD and all those other useful inputs. I think it's better to be patient and build the system back up, slowly, than to try and cram everything into a small budget at once.V。

并联单端2A3后级扩大机

併聯單端2A3後級擴大機沈皓中先生原創猶記得去年新春音樂欣賞會，我使用一部2A3推挽後級和SA-240A綜合機搭配筆者約180公分高，效率91dB的點音源大型鑑聽喇叭。

2A3聲音質地艷麗不可方物，極富感染力，其功率雖然已不小，然在大音壓下，中低及低頻段的控制力難免捉襟見肘。

或許您會認為換個效率超過100dB的喇叭系統不就一切OK！似乎大部份的專家們都主張只要擴大機真正質優（專家們以為小瓦數，較容易做得精緻完美），小功率機配高效率喇叭系統才能趨近完美，但從現實面看，為何歷代諸如Audio Research、McIntosh、Marantz、harman kardon、Leak…之銘器，絕少單端小瓦數者。

唯美主義精神再提兩個真實又殘酷的例子：（1）朋友曾老哥的2瓦45單端機，憑心而論已屬傑作，但音樂欣賞會未開始前，筆者即預判且告訴與會朋友，在大音壓下，場面可能稍微失序，即便使用的是靈敏度超過100dB的號角大系統喇叭，結果證實和預期相符。

這個系統在正常且稍大一點的聆聽聲壓情況，各方面的表現的確在業餘DIY圈子已是鳳毛麟角，也因此我曾特地將該45單端機寫了一篇製作報導(音響城邦25期)，給喜愛小功率的朋友們作為裝機參考。

（2）台中大坑周老師家的Altec A5劇院之聲，使用全套MBL晶體機，確實技驚四座。

許多老Altec的專家擁躉，簡直難以想像這對Altec能出得如此美聲，並且保持非常良好的聲部平衡，過去一整年裡各場音樂欣賞會的情形大致均是如此。

相同條件搭配優質擴大機時，很顯然的結果，擴大機的功率仍是愈大愈好。

又如桃園侯兄，曾為其B&W老801換過幾十組單端、推挽機，每次僅高興一二日，即逐漸發現聲部不平衡的缺點（記得佑昇李老板也和這對喇叭奮戰多年），儘管中高頻再怎麼通透自然，可是怎麼樣都不像是一對大傢伙應有的雍容自在及權威感。

前兩個月終於接受筆者的建議，以高品質大功率擴大機搭配801，即刻周遭燒友亦跟進二對801。

nadd3020v2说明书

nadd3020v2说明书
Denon D3020 v2是一款功能强大的迷你放大器，旨在帮助用户轻松
获得高品质的音乐体验。

D3020 v2可以轻松与您的所有喜爱音频设备互连，并且可以提供精确的声音处理和完美的聆听体验。

带有2x50瓦爆炸型功率的D3020 v2可以提供出色的音质，可以提供
宽广的频率响应，可以提供低频和高频的细节，以及对象更加清晰的声音。

D3020 v2拥有最新的技术，配备了广播级的忠实度，可以放大耳机，同
时也可以支持经低音提升（BassBoost）功能，以加强低频下的体验。

D3020v2还支持USBDAC功能，可以轻松挂载数字音频文件到您的系统，使您可以享受更高质量的音频，以达到更好的体验。

D3020v2功能强大的输入接口包括2个数字光纤连接器，1个数字同
轴输入，以及3个模拟立体声输入接口。

它还拥有一个户外坚固的金属壳体，帮助用户安全地保存D3020v2、它采用了一块超高品质的塑料壳，可
以使其可靠地工作在各种恶劣的环境条件下。

D3020 v2还可以通过其他的设备，如AirPlay，Spotify Connect，DLNA，有线网络等，来连接各种音频设备，使您可以更加轻松地获得最优
质的音频内容。

D3020v2还提供一系列混响和均衡设置。