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Old 23rd September 2012, 07:43 PM   #211
adiaz is offline adiaz  Spain
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Join Date: Sep 2011
Quote:
Originally Posted by nigelwright7557 View Post
I found that with 20,000uf plus per rail I was getting very loud turn off pops/thumps/siren noise through the speaker. Its to do with the power supply decaying slowly upsetting the 2092.
If you can live with the pops then thats fine.
I talked to IR about it and they suggested a circuit that detects low voltage on VCC and holds the reset pin low on power down.
Can anyone tell me what is the sound quality of the L15D?

Normally the class D sound worse treble.

What would you advise me?, Build a class AB amplifier with mosfet or buy ljm L15D Class D.

to amplify studio monitors.
Thank you.
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Old 2nd November 2012, 01:42 AM   #212
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by adiaz View Post
Can anyone tell me what is the sound quality of the L15D?

Normally the class D sound worse treble.

What would you advise me?, Build a class AB amplifier with mosfet or buy ljm L15D Class D.

to amplify studio monitors.
Thank you.
I'm using L15DX2 as my home amplifier.
Use the computer as a source of sound, PMC FB1 + as speakers.
Its performance is very good.

If you like class AB. A simple small amplifier L6 is very good,
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Old 2nd November 2012, 03:36 AM   #213
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Perhaps you might check out the recent upgrade offered for the PB1+ (now called the PB1i with it's new 'tweeter') - really nice speakers - very good to hear that the L15D suits them so well.
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... jh
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Old 3rd November 2012, 10:03 AM   #214
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Default L-15D mounting 4019H & D669 on heatsink

Hi Everyone,

Nearly finished soldering the L-15D modules, but I'm a bit confused about how to mount the 4019H and D669 to the heatsink. The confusion started when looking at pictures of the L-15D Pro on ebay, where it was clearly stated that insulation should be used. Is this needed for the L-15D as well? Or can they be just mounted to the heatsink directly?
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Old 5th November 2012, 11:12 AM   #215
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Can anyone help me answering my previous question. I know it must be a stupid newby question, but I cannot figure it out. I've looked at the IRF documentation on the 4019H and at the reference design document for IRAUDAMP7D, but could not find any information regarding the insulation. I'm an audio hobbyist looking for help.

Thanks in advance.

Arnoud
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Old 5th November 2012, 11:25 AM   #216
MrSlim is offline MrSlim  Canada
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Location: Ottawa, Ontario
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Quote:
Originally Posted by audionootje View Post
Can anyone help me answering my previous question. I know it must be a stupid newby question, but I cannot figure it out. I've looked at the IRF documentation on the 4019H and at the reference design document for IRAUDAMP7D, but could not find any information regarding the insulation. I'm an audio hobbyist looking for help.

Thanks in advance.

Arnoud

I purchased a pair of completed L15D's and they did not have insulating pads on the devices, so you are probably fine without. Notoriously, they also did not have any heat sink compound, which I made sure to add before firing them up.
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Old 5th November 2012, 11:30 AM   #217
alkasar is offline alkasar  France
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Location: near Paris, France
Quote:
Originally Posted by audionootje View Post
Can anyone help me answering my previous question. I know it must be a stupid newby question, but I cannot figure it out. I've looked at the IRF documentation on the 4019H and at the reference design document for IRAUDAMP7D, but could not find any information regarding the insulation. I'm an audio hobbyist looking for help.

Thanks in advance.

Arnoud
Depends on the package. Does your 4019H have a metal back ? if yes, an insulation is needed.
Seems to me that IRFI4019H is in an insulated package, so no need for insulation pad.
Click the image to open in full size.

However, I would definitively put thermal paste !


edit: oops, response crossed MrSlim
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Old 5th November 2012, 08:25 PM   #218
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Hi MrSlim & Alkasar,

Thank for your replies. I will mount them with some thermal paste to the heatsink.
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Old 2nd December 2012, 09:41 PM   #219
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How this L15D performs on low power levels 5-10W ?
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Old 3rd December 2012, 03:20 PM   #220
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Quote:
Originally Posted by ZhurayYuk View Post
How this L15D performs on low power levels 5-10W ?
I'm not sure how much power i'm using whilst listening to my music, but I doubt I ever reach 5 - 10 Watt RMS

It sounds pretty good on my Dynaudio Audience72SE. When compared to a lyngdorf TDAI 2200 it lacks a little refinement (harsher highs), but for the money i think it is unbelievable. There is a little white noise when you put your ear close to the tweeter. According to the specs it should be dead silent. The amps are connected to a connexelectronic SMPS 800RE powersupply and they get their signal from a Emotiva XDA-1 DAC. This is all rather subjective. Will post more factual information later.
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