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-   -   Sure irs2092 how to mod for 4 ohms? (http://www.diyaudio.com/forums/class-d/218855-sure-irs2092-how-mod-4-ohms.html)

Bengali 1st September 2012 12:49 AM

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

sweetperfume 1st September 2012 07:57 AM

You will require 5 amp supply....50-0-50volts

Bengali 1st September 2012 04:02 PM

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?

nigelwright7557 1st September 2012 09:56 PM

Quote:

Originally Posted by Bengali (Post 3147677)
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.

jlester87 19th September 2012 02:14 AM

Quote:

Originally Posted by nigelwright7557 (Post 3148613)
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

jlester87 19th September 2012 02:30 AM

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

nigelwright7557 19th September 2012 09:42 AM

Quote:

Originally Posted by jlester87 (Post 3170322)
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.

nigelwright7557 19th September 2012 10:55 AM

Here is my circuit for tc4420 circuit.
http://www.ckp-railways.talktalk.net/4420.jpg


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