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Old 18th September 2005, 11:54 PM   #1
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Angry SI beats my AMP1-B's

Well I just did an AB comparison between my modded SI and my 6-channel AMP1-B and it almost made me cry. Yes I said cry, because my SI just made $500 worth of parts and over 30 hours worth of effort feel like a waste.

I had just finished making a cardboard mock up of some OB line arrays I plan on building, and just for fun I wanted to see how loud it would play with the SI. As soon as I turned it on my jaw dropped and I asked myself "where the h*ll did that tight defined midbass come from" because it wasn't there a few minutes earlier with the AMP1-B.

I was not at all dissatisfied with the sound of the AMP1-B's before the comparison, but now...............

*sigh* Anyone interested in a 6-channel amp?
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Old 19th September 2005, 02:15 AM   #2
BWRX is offline BWRX  United States
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you should try the AMP3

honestly, don't feel disappointed. the AMP1-B can drive more difficult loads and will be able to do so much louder. but if your listening room is small and your speakers are efficient, the AMP3 is very hard to beat.
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Old 19th September 2005, 03:05 AM   #3
jleaman is offline jleaman  Belgium
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Dont think you have wasted any thing. Just take a deep breath and relax it might just be something simple wrong maybe ? or that your over tired / stressed take a breather and listen to it tomorrow..
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Old 19th September 2005, 03:52 AM   #4
Luke is offline Luke  New Zealand
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whats an SI?
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Old 19th September 2005, 04:06 AM   #5
hongrn is offline hongrn  United States
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A Sonic Impact amp.

Sonic Impact
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Old 19th September 2005, 04:31 AM   #6
Luke is offline Luke  New Zealand
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interesting,

have these had a lot of good press?
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Old 19th September 2005, 04:37 AM   #7
jleaman is offline jleaman  Belgium
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Quote:
Originally posted by Luke
interesting,

have these had a lot of good press?

it's just another chip amp. WOW!!!
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Old 19th September 2005, 04:56 AM   #8
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Yeah But a class D one. Tripath are .... I think, probably the first to approach "high end" with class d, they've since been surpassed. For the cost of them though... I'm tempted to try one eventually, people around seem to love them. I bet they spend ten times more modding them than they did on the little amps themselves.

theAnonymous1, let them be tears of joy Welcome to Class D.
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Old 19th September 2005, 07:30 AM   #9
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It may be the output protection relay in Amp1-B, try it without the relay in signal path. It would be better to use a protection circuit where the PSU is disconnected from the amp in case of DC.
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Old 19th September 2005, 08:31 AM   #10
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Hi,

Wow, I'm sorry I got my threads mixed up, low blood sugar, drunk, actually I wish, there's no excuse for that kind of post, my mind is all over the place today

I see you've done alot of work on this.

This is the beast with four SMPS in series isn't it?

Do you still have the dummy load connected in series? Maybe that's the problem.

What if you tried something silly like a "speed up" cap in parallel with that series resistor, 1nF maybe, probably less?

It could be the supplies themselves. Maybe you could rig up some batteries or grab another raw DC supply just to test the module itself with, see how it sounds all on its own? You may have further tweaking to do with the local supply/decoupling caps etc, but I think you've been down that road already, right?

Feeding six amps off of four SMPS in series... I'm impressed, but your supplies aren't purpose built either, they simply may not be able to handle the draw that low frequency signals demand (for six amps at a time). Disconnect half the modules and see if it helps? Maybe you could squeeze a little more out of it in the low end if you reversed the phase of three of the amps? Then you at least get supply pumping that works for you, and more efficient use of the power.

Are the high's similar?
Can you post more about what you're actual setup is currently here so we can have a look and figure it out a bit more?
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