Sure irs2092 how to mod for 4 ohms? - diyAudio
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Old 1st September 2012, 12:49 AM   #1
Bengali is offline Bengali  United States
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Default Sure irs2092 how to mod for 4 ohms?

Hi,

The user guide shows spec at 4 ohm but from what little info is available, this only works at 8 ohms?

I would really appreciate some help on what to to mod for use with 4 ohm load since I have maggies.

What voltage current rating do I need for 4 ohm load? I'm looking at those Antek PSU for quicker assembly.

Can I use a tube pre amp to drive this sure amp module?

Thanks
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Old 1st September 2012, 07:57 AM   #2
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You will require 5 amp supply....50-0-50volts
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Old 1st September 2012, 04:02 PM   #3
Bengali is offline Bengali  United States
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Thanks.

They replied and said it will work with 4 ohm but not full output. Do you know what the output would be?

Can the onboard pots be shorted or removed so one can use tube pre to drive it?

Curious if the tas5630 2x300 sound better for 4 ohm load?
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Old 1st September 2012, 09:56 PM   #4
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Quote:
Originally Posted by Bengali View Post
Hi,

The user guide shows spec at 4 ohm but from what little info is available, this only works at 8 ohms?

I would really appreciate some help on what to to mod for use with 4 ohm load since I have maggies.

What voltage current rating do I need for 4 ohm load? I'm looking at those Antek PSU for quicker assembly.

Can I use a tube pre amp to drive this sure amp module?

Thanks
I run a irs2092 amplifier into 2 ohms but I have 4 irfb4227's driven by transistor buffers.
The 2092 works ok into irf4019's and 4 ohms without gate drivers.

I run the 2092 into 4 ohms with 2 irfb4227 but again I need a gate buffer.

Another danger area with the 2092 is large smoothing capacitors. I found with 20,000uf per rail it thumps or howls on power down for about a second.

One of my early 2092 designs used an SRPP tube driver stage and it sounded very clean.
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Old 19th September 2012, 02:14 AM   #5
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Quote:
Originally Posted by nigelwright7557 View Post
I run the 2092 into 4 ohms with 2 irfb4227 but again I need a gate buffer.
Hi ,

Will the OCP of irs2092 still working after you put a gate buffer? Can you share how you implemented the gate buffer?

Thanks
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Old 19th September 2012, 02:30 AM   #6
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Is the 2092 still need a gate buffer for 1pair irfb4227?

Quote:
The user guide shows spec at 4 ohm but from what little info is available, this only works at 8 ohms?

I would really appreciate some help on what to to mod for use with 4 ohm load since I have maggies.
You can check the IRAUDAMP7S datasheet, you need to replace some resistors and the voltage should be +-50 to 60VDC

Last edited by jlester87; 19th September 2012 at 02:53 AM.
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Old 19th September 2012, 09:42 AM   #7
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Quote:
Originally Posted by jlester87 View Post
Hi ,

Will the OCP of irs2092 still working after you put a gate buffer? Can you share how you implemented the gate buffer?

Thanks
The OCP will still work with buffers.

I just put the tc4420's in series with the gate drive and powered them off VB and VCC.
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Old 19th September 2012, 10:55 AM   #8
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Here is my circuit for tc4420 circuit.
http://www.ckp-railways.talktalk.net/4420.jpg
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