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Old 15th October 2012, 12:14 AM   #41
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Noah: It looks like you have spent a good amount of time researching your amp choices before deciding on the Connexelectronic IRS2092 Amp module. Would you mind sharing your thought process?

Below is summary of choices that I have come across and it can be a little overwhelming determining which is best. I guess "best" is subjective, but I would like high quality for a reasonable cost. Below is a summary of what I have come across:

Sure Electronic's "Tripath" Amp- These are low cost, but I see numerous mods to upgrade these amp parts. This does not appeal to me.

HIFIMEDIY- These look like upgraded versions of what Sure Electronic offers and people seem pretty happy with the cost to value relationship.

Hypex UCD 180/400/NCore- This brand look like Class D leader, but carries the highest cost, especially the latest NCore technology. It looks like you can get the "standard" 180/400 amp modules for a reasonable cost. How would these compare to IRS2092 modules you are interested in?

ClassDAudio- There is not a whole lot of information of these, but they appear to be well regarded for less than similar offering from Hypex. I would not expect these to be at the NCore level.

Connexelectronic IRS2092- I really have not heard of these, but I know that Cristi has earned a very good reputation for a quality product at a reasonable price point. Are you expecting these to perform at the ClassDAudio or Hypex level?
 
Old 15th October 2012, 05:44 AM   #42
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Hi Mike,

I've read pretty much only good things about the IRS2092-based amps; search for threads with L15D and L20D in the title.

I was looking at the ljm-designed modules on ebay, but can only think parts quality suffers at those prices.

I've read nothing but good things about the build and sound quality of Cristi's amps and PS, and have a much better feeling about spending my money on those.

I thought hard about the ncores.

People are raving about them, but they also go on about cables and such which I certainly can't hear a difference in.

When I finish my amp, I'll see if I can find someone in the area with ncores to compare, and if there's enough difference I can always build an amp with those, likely just for the L/C/R's.
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Old 15th October 2012, 06:11 AM   #43
Cristi is offline Cristi  Europe
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Default IRS2092 alternatives

Noah, You can either wait till the dedicated power supply will be available (hopefully in few weeks) or chose any of the existing suitable sollutions, as explained before, two SMPS800RE would be the most suitable for the moment, except the lack of power cut-off in case of DC component.

If you gonna chose any other vendor products, I can only suggest to chose Hypex nCore. I do not have them or listened any of them, but I trust Bruno's skills and I believe he's the one who can do something really impressive. The next would be only HIFiMeDiy, but I guess IRS2092 still sound better.
Other vendors such as Sure or L15, L20 I wouldn't even bother to consider, even if would cost 1$. They are made of either fake, either dismatled components, see the attached close-up view (and you can search more on the forum from user's posts) where you can clearly see the IRFI transistor is grinded and laserprinted, then the output inductor have no marking, is a cloned version of the original sagami which is a very good inductor. the fake one is geeting hotter because of cheaper core material which exhibit higher losses and poorer linearity, and also much lower saturation current. If the fake inductor and transistors is used, he THD curves copy-pasted from datasheet of IRaudamp 7 have nothing to do with the reality, as the most important components are out of specs. these boards features no over-voltage or under-voltage protections, and no over-temperature protection, which I consider that even the cheapest amplifier ever must feature them otherwise will become useless after first shortcircuit or overtemperature. the output capacitors used is the wrong type, used for EMI filters, and has larger ESL than the correct ones which of course cost more. the board layout is terrible for a class D amplifier, single layer, no copper pour, with huge GND loops which will generate a lot of EMI, and will suddenly blow up when you less expect this due to overvoltage spikes associated with poor layouts.

Note that most ebay sellers do not offer warrany or offer for an extra ~8 usd, no tracking number for shipping, or add few usd, so the overall price if you chose all these option is close to 25-30 usd. At a similar price I can offer this board Connexelectronic
which is much more decently designed and built, use only genuine components, have all the protections which the cheap boards lack of, continuous copper plane on top layer, large output inductor for higher saturation current, offering better linearity, and the size is just a fraction, 35x95mm and 35mm tall.

I have sent some boards for test to a PA company and they will send me the full test report including THD graphs measured with Audio-Precision system two, and as soon as I will get them, I can complete the manual and include the real measurements too, not copy-pasted from IRaudamp manuals, which are totally different than the real one if different parts and layout is used.
Attached Images
File Type: jpg overview.JPG (208.7 KB, 827 views)
File Type: jpg fake transistor.JPG (157.9 KB, 817 views)
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Old 15th October 2012, 11:57 PM   #44
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Quote:
Originally Posted by Cristi View Post
Noah, You can either wait till the dedicated power supply will be available ...
That's what I will do.

For the new 600W and 1200W SMPS do you know the dimensions and locations of input and output connectors?

Thanks
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Old 16th October 2012, 02:23 AM   #45
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Thanks Noah and Cristi for your replies.

Noah: I hope that you keep a build thread with your impression of the IRS2092 amp modules from Connexelectronic.
 
Old 18th October 2012, 02:58 AM   #46
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Cristi, can you at least say if they'll fit within a 1U case?

Thanks


Quote:
Originally Posted by noah katz View Post
For the new 600W and 1200W SMPS do you know the dimensions and locations of input and output connectors?

Thanks
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Old 18th October 2012, 04:42 AM   #47
Cristi is offline Cristi  Europe
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The new SMPS board will be 100x150mm, will fit into a 1RU case, and I will give the exact size next week. The connectors will be places at the extremities of the board, for shortest routing path to amplifier modules.
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Old 18th October 2012, 04:53 AM   #48
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Great!

It just occurred to me that if it would help your workflow, I could order and pay for the 11 amp modules now.

When the new SMPS are ready you could ship everything together.
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Last edited by noah katz; 18th October 2012 at 04:55 AM.
 
Old 18th October 2012, 04:56 AM   #49
Cristi is offline Cristi  Europe
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Ok, that's great and encouraging to push the things faster.
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Old 18th October 2012, 05:10 AM   #50
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Cristi, when I try to add the modules to my cart, it says "Your Shopping Cart is empty!"

But if I go back to the product page, at the upper right it says

"4 x CxD250-HP
11 x CxD300-8R
1 x CW2C-10A-T"

That's one CxD250 too many, but I don't know how to change it.

If I go to checkout, it says again "Your Shopping Cart is empty!"

Maybe you could just send me a Paypal invoice for

3 x CxD250-HP
11 x CxD300-8R
1 x CW2C-10A-T

to nlkatz a t gmail.com

Thanks
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