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Driving the TakeT H2 - Page 9

post #121 of 181
10/28/07 at 7:10pm
When people are talking about listening at "louder volumes" (where an H2 with a mid-range amp will distort), what kind of volume do they mean exactly? The kind of volume that bass-head DJ-types like? The kind of volume that you shouldn't really be subjecting your ears to in the first place? I'd just like to know if that problem is possible for me, since I do not let myself listen at excessive volumes.

What are some balanced amplifiers that could run them at middle-volume without the TR2?

Thank you!
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post #122 of 181
10/29/07 at 4:41am
Quote:
Originally Posted by crazyface View Post
When people are talking about listening at "louder volumes" (where an H2 with a mid-range amp will distort), what kind of volume do they mean exactly? The kind of volume that bass-head DJ-types like? The kind of volume that you shouldn't really be subjecting your ears to in the first place? I'd just like to know if that problem is possible for me, since I do not let myself listen at excessive volumes.
Thank you!


Without the TR2, the Yamaha 110w amp and even the RPX-33 were fine most of the time, with most music. It's only with music that has big bass notes where the amp is putting out too many watts for the H2, but not enough voltage (I think) that the H2s distort, and not at an excessive volume.

The other time is with classical where you have to listen "loud" to hear any of the quiet notes. When the big sound comes in, the H2 distort.

Those few seconds where there isn't sufficient volume/control/power/whatever, ruin the experience for me.

Most of the time I listen fairly quietly, just cranking it up for the exciting bits, and listening as quietly as I can enjoy at other times. I'm careful never to listen at damaging levels and certainly stay well below reference level (105db?) almost all the time.

It depends on your definition of excessive volume. much Every live rock concert I've ever been to was excessively loud to me.

I do find that the H2 need a fair volume to sound convincing and come to life though, they aren't quiet listening phones, to me.

With any amp I tried and the TR2 in the picture, the H2 are capable of far higher volume than I would listen to.


Quote:
Originally Posted by crazyface View Post
What are some balanced amplifiers that could run them at middle-volume without the TR2?

Depending on your definition of "middle-volume", I think any loudspeaker amp at all can do the job, most of the time. The H2 are very revealing of poor quality power though so amps like my Yamaha don't do them justice anyway, apart from the lack of volts.

I don't know about any suitable balanced amps.
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post #123 of 181
11/1/07 at 11:55am
OK here is the amp from Mr. Takei's friend. This is his reply with the main info in it. He sent a PDF as well but it's just a combination of the details below and the website.

Quote:

I built an amplifier for TakeT H2XLR at this summer, and started to sell it from this October.
This amplifier is now only for domestic(Japan) use only, because it works only with 100 Volt AC
Now, I am still developing and upgrading it, and planning to add power voltage selection.

The outline feature of the amplifier is below.
Model nameAlio, model code is CP-1
Using tubes4 of 6BM8(ECL82)
Basic functionPre_amplifier with power stage for H2
Input/Output3 RCA input, 2 PCA preamp output, and headphone output
Interface to H24 pin XLR (H2XLR is available)
SchematicsSRPP (OTL) , capacitor coupled to H2, and no negative feedback
TR2 is not required, the amp drives H2 directly without any transformer.
Maximum power1.8W (THD 3%) , 95V RMS for H2 (nominal impedance 5K Ohm)
Useful power1W (THD under 1%), 70V RMS for H2
Frequency range20Hz(0dB) to 70kHz(-3dB)
Noise levelLess than 5mV for H2

The price of the amplifier is \158000(JPY), and direct order inside Japan is only available at now.

The picture of the amplifier is on my website http://www.byon.co.jp (sorry only in Japanese)
And, attached PDF may give you some more information.

Thanks and best regards,

Kazuaki Baba (Byon Corporation)

http://www.byon.co.jp/
On another note, my RWA Sig 30.2 came today. Gorgeous amp, best SQ I've heard from an amp in many areas and it's only a couple hours old.

With the TR2 it drives the H2 well and truly loud enough. Without the TR2, nope.
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post #124 of 181
11/1/07 at 2:51pm
£660 for the Alio is less than Precide want for the AMT Amp 2.

It should work fine with a voltage converter block I guess. Who's going to take the plunge then?


And congrats on the RWA Sig 30.2!
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post #125 of 181
11/1/07 at 3:00pm
Quote:
Originally Posted by stevenkelby View Post
OK here is the amp from Mr. Takei's friend. This is his reply with the main info in it. He sent a PDF as well but it's just a combination of the details below and the website.



On another note, my RWA Sig 30.2 came today. Gorgeous amp, best SQ I've heard from an amp in many areas and it's only a couple hours old.

With the TR2 it drives the H2 well and truly loud enough. Without the TR2, nope.
Looking forward to further impressions with the Sig 30.2!
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post #126 of 181
11/1/07 at 3:06pm
It will work fine on a step down converter so what are you all waiting for...
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post #127 of 181
11/1/07 at 9:29pm
The real question is whether 95vrms is sufficiently loud to satisfy
everyone. Because if it is, then i have a much simpler unbalanced
amplifier that runs on +/-150 that would work great (no output
cap needed) (all solid state), or an all tube thing that would also
work great.
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post #128 of 181
11/2/07 at 1:04am
Quote:
Originally Posted by kevin gilmore View Post
If you like solid state, you can do this.
http://gilmore.chem.northwestern.edu/take-t.gif
KG:

What's the part number on that Ixys widget-thinger? Looks like 10b90, but I cannot find a datasheet for it. Is this what you're using in the KGBH-SE to replace all the 2sa1968s?
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post #129 of 181
11/2/07 at 5:05am
Quote:
Originally Posted by kevin gilmore View Post
The real question is whether 95vrms is sufficiently loud to satisfy
everyone. Because if it is, then i have a much simpler unbalanced
amplifier that runs on +/-150 that would work great (no output
cap needed) (all solid state), or an all tube thing that would also
work great.
It would surely make the amp that much cheaper to make. One H2 owner has to take one for the team...
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post #130 of 181
11/2/07 at 7:38am
Quote:
Originally Posted by luvdunhill View Post
KG:

What's the part number on that Ixys widget-thinger? Looks like 10b90, but I cannot find a datasheet for it. Is this what you're using in the KGBH-SE to replace all the 2sa1968s?
10M90S
http://ixdev.ixys.com/DataSheet/98729.pdf
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post #131 of 181
11/2/07 at 11:46am
Quote:
Originally Posted by kevin gilmore View Post
thank you! 200 minimum at Digikey and out of stock until mid-December at Mouser
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post #132 of 181
11/2/07 at 12:27pm
That was fast. When i bought my pile at mouser about 10 weeks
ago they had 3000 parts in stock. This part is going to be popular
for a whole bunch of things in the near future.
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post #133 of 181
11/2/07 at 1:21pm
how loud w/95 Vrms?

"1. sencitivilty of H2 ; 96dB/100Vp-p" from:
http://www.head-fi.org/forums/showpo...&postcount=100

I certainly don't think 105 dB clipping level is adequate in a > US$1K Headphone system

of course driving the H2 to realistic levels could easily be a Safety Hazard, depending on wiring, amplifier, and H2 internal construction - you must be aware of Electrical Safety Requirements - Balance direct drive may be extra hazardous
http://www.head-fi.org/forums/showpo...6&postcount=84
http://www.head-fi.org/forums/showpo...&postcount=106
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post #134 of 181
11/3/07 at 11:31am
I've been shocked by the tweeter and it's a very light zap. It was kinda hard to tell where the electric shock ended and treble began, though In a good way, ofcourse.

BTW, sort of OT but does anyone know what the electrical components at the bottom of the housing are? Looking at the diagram on Duggeh's review, it looks like there are a couple of capacitors in there among other things.
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post #135 of 181
11/3/07 at 11:37am
5 Resistors per earcup. email sent.
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