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Class D Switching Power Amplifiers and Power D/A conversion

Modifing a Lab Gruppen FP series clone amplifier
Modifing a Lab Gruppen FP series clone amplifier
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Old 9th November 2017, 08:56 AM   #1
us1070 is offline us1070  India
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Default Modifing a Lab Gruppen FP series clone amplifier

Hello

Looking to bypass the input stages of Lab Gruppen fp14000 clone to make sound more liver. Mostly trying to bypass the gain board circuit

Has anybody done this?
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Old 9th November 2017, 11:00 AM   #2
turk 182 is offline turk 182  Canada
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it's a clone so all bets are off as to what you have and i've heard reports that some of the "clones" are so poorly designed that they go up in flames!
be careful your "liver" doesn't turn into "kidneys"!
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Old 9th November 2017, 11:33 AM   #3
ICG is offline ICG  Germany
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Location: I had a Déjà Moo - I've seen that BS before!
Well, I have to second that. Not only burnt/flaming boards because of too thin copper layers and wires etc are a problem, the capacitors in the cheap knock-offs are sometimes extremely dangerous. Way too low specs regarding voltage, temperature and especally bad ESR lead to sudden heat increase - even if the amp worked fine up to that point - which makes them expand rapidly. (read: explode. and no, that's not an exaggeration).

Aside that, the FPs sound excellent. What changes in sound do you expect by saying "sound more liver"? That says everything and nothing at the same time.

Test-swap the FP clone with another amp and compare if it really sounds better. If it doesn't, I'd suggest you modify your DSP settings, EQ and limiters change a lot of the sound. And before you do that, you should check if it's really the amp and not the input which lacks in sound quality, what bad mixers and compressed sources destroy in quality can't be brought back by any amplifier or speakers. How does your signal chain looks like? From source to speakers include everything please.
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Old 9th November 2017, 07:35 PM   #4
us1070 is offline us1070  India
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ICG I am using a cheap USB DAC ES9023P

This is how i currently run
DAC>FP14000>18inch Speakers

I tested with my Diyed AB amplifier which has no input states so it sound more Liver
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Old 9th November 2017, 08:27 PM   #5
turk 182 is offline turk 182  Canada
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"no input states so it sound more Liver."

could you explain what you are saying here in different terms?
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Old 9th November 2017, 08:52 PM   #6
ICG is offline ICG  Germany
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Location: I had a Déjà Moo - I've seen that BS before!
Quote:
Originally Posted by us1070 View Post
ICG I am using a cheap USB DAC ES9023P

This is how i currently run
DAC>FP14000>18inch Speakers
Ah, yes. 18in speakers. Yes, that explains EVERYTHING.
Fullrange, subwoofer or whatever or is there anything else involved besides the 18"? If they got a very high impedance in the high range then that's maybe the reason.

Quote:
Originally Posted by us1070 View Post
I tested with my Diyed AB amplifier which has no input states so it sound more Liver
Well, what do you mean by 'Liver'? You've been asked that several times before, I will not continue if you just repeat that nonexplanationary, nonsensical term (you surely don't mean the organ.. do you? ) once again.
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Old 9th November 2017, 10:25 PM   #7
turk 182 is offline turk 182  Canada
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so is it that he's running it into a pair of 18's and complaining he's got no top end??

"Liver" is good with onions and chalots!!
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Old 10th November 2017, 04:33 AM   #8
us1070 is offline us1070  India
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Quote:
Originally Posted by turk 182 View Post
"no input states so it sound more Liver."

could you explain what you are saying here in different terms?
I mean no input stages means no internal pre amplifier. I tested even with 2 inch floor standing speaker it transparent and smooth. Bought that amp for subwoofer use.

For my hifi Deejing my system is:
18inch speaker for below for 30hz to 150hz
10inch woofer for 150hz to 400hz
I am currently using 2inch speaker for 400hz to 2khz
Silk dome tweeter for 2khz and above
The crossover Music player software Jriver Media centre.

Quote:
Originally Posted by ICG View Post
Well, what do you mean by 'Liver'? You've been asked that several times before, I will not continue if you just repeat that nonexplanationary, nonsensical term (you surely don't mean the organ.. do you? ) once again.
What do i mean the term "more live"? If you connect like this than it is less live DAC>Crossover>Amplifier>Speakers than connecting like this DAC>Amplifier>Speaker

Last edited by us1070; 10th November 2017 at 04:35 AM.
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Old 10th November 2017, 09:58 AM   #9
turk 182 is offline turk 182  Canada
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now i'm even more confused...?
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Old 10th November 2017, 11:26 AM   #10
Samsara is offline Samsara  France
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I understand : alive, vibrant, bright, energetic...
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