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Old 29th January 2012, 04:33 PM   #2191
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Quote:
Originally Posted by Virpz View Post
Well, I forgot to mention that I had no source ( no input signal ) and by that I expected the resistors to survive with ease.
Was the input nulled or floating?
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Old 29th January 2012, 07:06 PM   #2192
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Hi Malefoda, I got the T2 on Friday but my wife, Carol, and I were in the middle of preparing for an East Indian Feast. The feast will end up with over 20 dishes (my wife is compulsive when it comes to food) and we have done this on and off for almost 25 years. The feast was yesterday and today I am sharing a relaxed day helping Carol come down before going back to work tomorrow. It's not a responsibility but a pleasure.
Tomorrow I plan to listen to the raw module and compare it to the Sure 4X TL2050 I am modding.
vmed_cha_gr reports that the T2 is dull in his system. My calculations show that at 4 ohms, the T2 should be slightly bright in the highs but not as much as the Sure is. However, If the bass and especially the lower midrange are fuller it could be masking the highs.
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Old 29th January 2012, 07:26 PM   #2193
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Jyoung I understand and even more I agree: real life pleasures with real people first!
The amp can wait
Is it with T2 with STA510 and at wich voltage and wich speakers ? As for me it will be T1 STA510@36V with 8 ohms speakers.
Dull, I hope not...
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QED T260, Thorens TD-318, Marantz CD-43, TK2050, JBL 4313B & MJK's OB: music!
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Old 29th January 2012, 07:32 PM   #2194
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Quote:
Originally Posted by kristleifur View Post
Was the input nulled or floating?
had caps on the rca's.
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Old 29th January 2012, 08:02 PM   #2195
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It is this Hifimediy T2 2*100W TRIPATH TK2050 TC2000 10000uf | eBay
STA505, 10000uF version. Hifimediy recomends about 28volts to be safe. The speakers are 4ohm ribbons, very revealing above about 4000Hz and through the midrange below 2000hz with a deep BBC Dip. The DIY speakers I am working on will have planar mid/highs, be revealing at all frequencies, and be pure resistance, so I'll be able to drop the zobel. But they won't be ready for months (until it warms up enough to work in my garage).
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Old 29th January 2012, 08:30 PM   #2196
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Default T2

Hi there.
From one thread to another. Tomorrow i will measure my tweeters. See if the amphion titaniums (from seas) are 4ohm or 6ohm. Then i will post my measurements here & find the final values for the filter. By the way i checked T2 to my Alesis monitor ones (4ohm loads) & have the same dull hights as the ampions. Lets see if i will get the perfest match here. I'll keep you informed.
Vassilis

Quote:
Originally Posted by jyoung070848 View Post
It is this Hifimediy T2 2*100W TRIPATH TK2050 TC2000 10000uf | eBay
STA505, 10000uF version. Hifimediy recomends about 28volts to be safe. The speakers are 4ohm ribbons, very revealing above about 4000Hz and through the midrange below 2000hz with a deep BBC Dip. The DIY speakers I am working on will have planar mid/highs, be revealing at all frequencies, and be pure resistance, so I'll be able to drop the zobel. But they won't be ready for months (until it warms up enough to work in my garage).
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Old 29th January 2012, 11:11 PM   #2197
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Hi Vassilis, Thanks for coming to this thread.
Hi again Malefoda,

I just hooked up my Hifimediy T2 and did a very rough comparison, two slow switches back and forth. The Unmodified Sure 4x TK2050 and the T2 are very close, the differences are small. I found the T2 slightly warmer in the mids, brighter in the highs. The lows were close enough that I can't comment. The T2 seemed more focused and the highs cleaner and less splashy, even if brighter. Both had a huge soundstage.
The fact that the T2 is bright and needs additional tailoring with an external zobel jives with my calculations. My calculations don't say why the T2 is brighter than the Sure.
I'm sorry Vassills, except for the slight extra midrange warmth of the T2, they both sound very much alike in my system.
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Old 29th January 2012, 11:33 PM   #2198
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Hi again, please check out my latest post on "Class-D Output Filter - A Case Study" I comment that if you want to replace your board's output filter with one designed specifically for your speakers, you can choose the 33uH inductor and calculate the capacitor to go with it. This way you can let the inductor remain constant, switch the capacitor to match different speakers, letting the corner frequency of the filter change, all without suffering problems. Of course you would have to change the zobel for each speaker.
By the way, I have four 33uH inductors on order, but I have not tested any of this theory. It could turn out that matching the output filter and zobel to your speakers, and thus reduce the excessive highs of the amps we are talking about, may take all the life out of the amps. It is possible we will end up having to tweak the highs to get what we want. One good thing is, by matching the zobel to the speaker, it reduces the variable of the tweeter inductance. Then we can simply adjust the single component, the capacitor(s) in the output filter, to get the highs we want.
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Old 30th January 2012, 08:12 AM   #2199
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Post ?

Before measuring my tweeters i just have a question. Which values (for 4ohm speakers) do most of the class-d manufactures recommend for the output filter ? I'm looking for the standard values they give for inductors, capacitors & zobel filter. I just want to have them for reference before modding the T2.
Thanks


Quote:
Originally Posted by jyoung070848 View Post
Hi again, please check out my latest post on "Class-D Output Filter - A Case Study" I comment that if you want to replace your board's output filter with one designed specifically for your speakers, you can choose the 33uH inductor and calculate the capacitor to go with it. This way you can let the inductor remain constant, switch the capacitor to match different speakers, letting the corner frequency of the filter change, all without suffering problems. Of course you would have to change the zobel for each speaker.
By the way, I have four 33uH inductors on order, but I have not tested any of this theory. It could turn out that matching the output filter and zobel to your speakers, and thus reduce the excessive highs of the amps we are talking about, may take all the life out of the amps. It is possible we will end up having to tweak the highs to get what we want. One good thing is, by matching the zobel to the speaker, it reduces the variable of the tweeter inductance. Then we can simply adjust the single component, the capacitor(s) in the output filter, to get the highs we want.
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Old 30th January 2012, 12:27 PM   #2200
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I haven't seen a recommendation and the schematics I've seen vary a lot, especially considering that the oscillation frequency varies between manuf. The values on the T2 board, from the schematic on the web site, are 11nH, 0.47uF, and the zobel is 0.47uF and 10ohms.
Now that I have had a chance to really hear the T2, I find the warmth in the midrange does mask some detail. Compared to the Sure, the T2 is not as clear and wonderfully detailed. I think the Sure is on the lean side and accentuates ambiance and detail, but I love it so. The T2 is probably more neutral.
I suspect that the 3.6uF input capacitors (the web site says 3.3uF but the capacitor says 3u6, and I interpret the u in this takes the place of the period) are causing the midrange warmth. I tried different values on the Sure and discovered when I got up to 2uF that the midrange was getting too warm so I backed off to 1.0uF and it sounds wonderful. I know I am sacrificing some bass, but the midrange is so beautiful, fun, and satisfying that I am willing.
My experience with changing the zobel on the Sure is that it effects the highs a lot but not the clarity of the midrange as much. So I think changing the whole output filter is going to do the same.
Then there is the 10000uF power capacitor, what effect does it have on the midrange? By the way, I am using 29v DC.
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