关于AKG K240SEXTETT 的版本和AKG代工的REALISTIC PRO-50的一些介绍

davidxtb · 发表于 2010-5-5 00:01:57

交易区新帖推荐

放心了，我那把壶价格有限，价格也是白菜级别的，重在实用。

[ 本帖最后由 davidxtb 于 2010-5-5 00:04 编辑 ]

weng098 · 发表于 2010-5-5 00:02:55

赶紧买金骏眉去，，，，，，，，，，，，，
俺等着蹭喝呢

davidxtb · 发表于 2010-5-5 00:08:26

我这儿只有祁门红茶，那把掇只也是放在办公室用的，没有敢拿回家。
以后找个机会和老婆报账了再拿回家。

weng098 · 发表于 2010-5-5 00:12:39

妖，，，，说200元，她还敢怎么说呢，，难道敢砸了你的壶

davidxtb · 发表于 2010-5-5 16:11:28

:D :D :D
主要是没有办法解释。那把壶明眼人一看就知道价位如何了，两百是肯定买不到的

lbcpc · 发表于 2010-5-9 20:22:24

听听EP，静一下心情……

haizen · 发表于 2010-5-9 23:57:12

原帖由 yangmetal 于 2010-3-10 17:04 发表
这帖还不加精？？？？

是啊，这么好的帖子。

davidxtb · 发表于 2010-5-15 23:07:42

最近看了一下REALISTIC PRO这个系列的耳机资料，还是很有意思的。
它是美国Radio Shack的耳机品牌，出了一系列的产品。比较有名的是PRO30那款，而好声的则是PRO50这款。

RadioShack 资料：
总部设于美国德克萨斯州沃兹堡的 RadioShack Corporation (NYSE: RSH) 是美国信誉最佳的消费电子产品专业零售商，销售的产品种类包括无线通信、电子部件、电池和配件以及其他数码技术产品和服务。公司在全国设有6,874 多家商店，据估计，有 94% 的美国人从居住地或工作地抵达 Radio Shack 的商店或经销商处只需 5 分钟时间。公司经验丰富的销售人员和“您有问题，我们就有答案”的标志性定位，为 RadioShack 实现其使命，即“让技术在每个美国家庭中都不再神秘”，提供了强有力的支持。

　　公司的雄心是成为美国发展最令人羡慕的公司，其所采用的 A-P-O 商业模式为此提供支持。该商业模式的第一部分是支柱 (A) 产品 - 公司以其支柱产品种类，包括无线通讯产品及部件、电池及配件而闻名。公司将继续优化这些业务中的销售规划和资源配置，争取获得更高的收益。供人分享的 (P) 产品是公司的竞争对手选择不参与销售的产品系列，例如内部通讯系统和天线。机会主义 (O) 产品则是那些季节性产品和尚未普及的高新技术和时尚潮流产品。

　　公司的 A-P-O 商业模式为公司业务在未来的拓展奠定了基础。在这个模式下，RadioShack 组建了三个战略性业务单位 (SBUs)。每个战略性业务单位都将主要精力集中在公司商业模式下的一部分核心产品上。这三个战略性业务单位是Connecting People (人际联系)、Connecting Places (地域联系) 和 Connecting Things (物品联系) 。
它的PRO-30的资料：
Realistic Pro-30
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Realistic Pro-30 & its box
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Realistic Pro-30 & its box
Contents

* 1 Realistic Pro-30 - Overview
* 2 General Description of the Sound
* 3 Pricing & Other Data of Interest
o 3.1 Technical Specifications
o 3.2 Modifications

PRO-30

[edit]
Realistic Pro-30 - Overview

The Pro 30 was the only orthodynamic headphone sold by Radio Shack in the US. This model appeared in Radio Shack's catalogs from 1981 through 1986 and was sold exclusively in Radio Shack stores starting at $39.95. It was probably manufactured for Radio Shack by Audio-Technica (or a company that was an OEM manufacturer for Audio-Technica). The drivers in Pro-30 look to be the same as Audio-Technica ATH-2 drivers. The Pro 30 frame (aka chassis or headset) is plain but comfortable and, like the ATH-2, the Pro 30 has easily detachable earpieces, which makes modification very easy. With a bit of simple modification the Pro-30 can sound very good.

The Pro 30 has one mechanical weak point: the yokes that hold the earpieces are fragile and can break if the headphone is dropped.
[edit]
General Description of the Sound
Realistic Pro-30 cups off headband
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Realistic Pro-30 cups off headband

Pro 30 is bassy with rolled off high frequencies in its stock form. The sound is very forward and there is almost no soundstage. With some modifications (damping and gluing the driver to the baffle) transient response can be improved as well as the frequency response. The annoying forwardness, lack of soundstage and nasal coloration are however impossible to get rid off. In my opinion there are much better orthodynamic headphones in the $40-$70 price range that Pro 30 seems to be selling for at the moment.

--Faust3d 12:08, 29 October 2008 (EDT)

Agreed that there's not much special in the stock Pro 30. I wouldn't call it bassy, since the mids are elevated and the top end is weak and the underdamped bass removes bass impact. It's smooth and listenable but blah, just like most unmodified isodynamics. The Fostex T40 particularly comes to mind.

While damping its driver and its vents transforms the Pro 30, the simple mod described below leaves it with a smoothly elevated ("shelved") top end-- perfect for a video production headphone but some people may not like it. "Very forward"? "nasal"? "impossible"? well, not in my opinion, but I can see where it would bother some folks.

This shelved treble response, similar to the sound of Sennheiser's classic MD 421 microphone, [1]is the result of a damping compromise made necessary by the Pro 30's solid, reflective back. Damp less and the bass rises and treble recedes, but transient response suffers. Damp more and bass disappears. This compromise can be circumvented by removing the solid back of the headphone, a nonreversible modification which was carried out by Head-Fi members JadeEast and ericj in October 2007.

Note that it's not necessary to glue the driver to the baffle. There's an elastomer gasket and the baffle's clamps hold the driver very tightly. The Pro 30 is the only ortho/iso headphone I've seen (aside from the Fostex models with screw-down clamps and the Yamaha YHD-3 and its variants) that takes such good care of this important detail.

For a long time, even after the auction prices of Yamaha Orthodynamics shot out of sight, Pro 30s were available for $15 or less, but recently the supply has dried up with the inevitable result. It remains the least expensive way to get an introduction to isodynamic sound without resorting to DIY.

--Wualta 15:23, 30 October 2008 (EDT)
[edit]
Pricing & Other Data of Interest

In the current market you can find Pro 30 anywhere from $20 to $80 depending on condition.
[edit]
Technical Specifications
Tandy / Realistic headphone brochure
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Tandy / Realistic headphone brochure

Impedance: 32 Ohms (recommended matching amplifier output impedance: 4, 8, 16 ohm)

Frequency Response: 20-20,000 Hz

Magnet: ferrite; diameter 38mm

Diaphragm: doublesided spiral aluminum voice coil, smooth, tensioned

Sensitivity: 98dB at 200 Hz / 1mW

Rated Input: 100mW

Weight: 190g
[edit]
Modifications
Realistic Pro 30 Drivers, Showing Damping Layer
Enlarge
Realistic Pro 30 Drivers, Showing Damping Layer

Here is an example of Pro 30 modification by Wualta

This is a sequence showing the disassembly of my original Pro 30, highlighting the damping pads I added and the original foam pads and how they work together. I'm assuming you already know why the driver and vents need a layer of damping. The Pro 30 is factory damped but it's simply not enough to bring the driver to a [more or less] flat response.

Everything's pretty squashed after being inside for 20+ years; the foam and felt have both molded themselves to the inside of the cup.

Much better mechanical design than the Yamahas, as you'll see. There are [only] 3 decent-sized rustproof screws holding the cup halves (earcup and driver cup) together. As usual, the screw heads are hidden underneath the outer circumference of the earpads, which do not have to be removed to gain access. The sequence begins with the earcup facing down and the driver cup (the part with the aluminum cap) lifted off.

The aim of this mod, as with all my mods, was to improve the sound but to be completely reversible. For example, the large factory foam disc could have its center cut out so it could be dedicated to the task of keeping pressure on the vent damping ring, but I wanted to keep everything as it was so modders would have the option of going back to stock.

The felt used is the cheapest acrylic craft felt you'd find for around a dollar a square foot at a fabric store. Don't be tempted to use denser, "better" felt.

[ 本帖最后由 davidxtb 于 2010-5-15 23:11 编辑 ]

davidxtb · 发表于 2010-5-15 23:12:02

REALISTIC PRO30和50对比图
非常有特色的包装盒，商标也很特殊的，都是在包装盒的右下角来一个REALISTIC PRO-X的标识

[ 本帖最后由 davidxtb 于 2010-5-15 23:13 编辑 ]

davidxtb · 发表于 2010-5-15 23:21:05

REALISTIC PRO-50算是AKG为Radioshack代工的产品，这款用了SEXTETT的单元和辐射器，但是头戴和横梁则有K340的风格，外观确实很精致大气。后来AKG自己打标识销售的产品则是K250，不过单元已经是纤维质的调音孔了，而非无源辐射器的结构。
The Realistic Pro 50 is a headphone made by AKG for Radioshack, which was also sold as the AKG K250 (although there are construction and driver differences between the RP50 and K250). This particular pair uses K240 Sextett drivers & radiators, and the elastics/pads are still in very good condition.

[ 本帖最后由 davidxtb 于 2010-5-15 23:23 编辑 ]