The Abletec is the best deal going on high power dual rail 53v supplies. Perhaps it should be a thread called "Abletec 450w dual rail 53v for $20"? It is certainly an enabler for these low cost IRS2092 amps. How much would it cost you to get a toroidal trafo and caps/bridge to do the same? Also this has momentary 900w capability which is a total advantage.
I am working through options for a 11 channel HT amp as my first diy amp project. It will be driven by a Marantz processor that has both unbalanced and balanced outputs. I have looked at options from Hypex as a lower noise fully balanced solution, but due to the budget constraints I have been reading threads in the forum to look for more budget conscious alternatives. The amps will drive 3x99dB/W 6ohm main speakers + 8x94 dB/W 8ohm coaxial surrounds, and ideally I will hit THX reference levels without significant distortion and enough headroom for dynamics. Depending on the price/quality, these might just end up being a short term unbalanced solution and a learning vehicle.
This IRS2092 + Abletec supply are on the current short list of options, and I have picked one up to evaluate along with two of the TPA3116 boards (audiobah and the Danzz board) for comparison since they seem to be so popular. The IRS2092+Abletec solution looks nice because of the price per channel and because it looks like I could pretty easily add a remote trigger output from the processor to turn on the amps and mute during on/off transients.
However, detailed specs and measurements on this IRS2092 board seem a bit hard to come by, and the user base here seems split between characterizing it as 'good/great' and 'ok but fatiguing'. I'm wondering how you guys that use it would characterize it after prolonged use and at moderate/low SPL levels. Do any of you have measurements that you could share? Unless I am misunderstanding the issue, the high oscillator frequency setting on some of these boards had made them run artificially hot and caused the components to overheat and distort?
This IRS2092 + Abletec supply are on the current short list of options, and I have picked one up to evaluate along with two of the TPA3116 boards (audiobah and the Danzz board) for comparison since they seem to be so popular. The IRS2092+Abletec solution looks nice because of the price per channel and because it looks like I could pretty easily add a remote trigger output from the processor to turn on the amps and mute during on/off transients.
However, detailed specs and measurements on this IRS2092 board seem a bit hard to come by, and the user base here seems split between characterizing it as 'good/great' and 'ok but fatiguing'. I'm wondering how you guys that use it would characterize it after prolonged use and at moderate/low SPL levels. Do any of you have measurements that you could share? Unless I am misunderstanding the issue, the high oscillator frequency setting on some of these boards had made them run artificially hot and caused the components to overheat and distort?
I forgot to get back on this..
Shipping was fast and packing very good.
They're hooked up to +-70v at 20KUF capacitance a rail.
Imaging is very good. Instruments have a nice 3D sound within their space.
Sound stage is also very good and can extend to 180 degrees.
Bass is very good beat frequencies and air around the strings come through nicely. Boyence and Kayne West CDs can be felt in your hair. Pumch and hit on the TD15S are as good as anyone could want.
Highs are good too, cymbals sound large sharp and clear with excellent attach.
Vocals are nice and clear standing in front of you. But maybe a bit essy. The Faital 140s I'm using for horn drivers are unforgiving.
OVer all tone isn't bad but maybe could use some warmth in some vocals.
There is some wide band noise but only with my ear a few inches away from the speakers.
It's a darn good refit for rust bucket chassis of little of no value.
I've had my pair of modules in my 'in tray' for almost 6 months, at last I've fired one of them up and had a quick listen, mono. I'm only running on a pair of 2 * 30V bench supplies at present but I have replaced each of the rail caps with two 100V/390uF Samyoung NXAs (lower impedance than my original swap to Rubycon ZLHs). I also have an output transformer which is a 5VA EI cored mains trafo re-wound on both primary and secondary to give me a 5:1 step down voltage ratio. I don't need too much power (20W or so is sufficient) and I'm doing an experiment to see if the trafo raises the SQ.
Fed from my transformer isolated TDA1387 DAC, the SQ stock wasn't at all interesting. Having a quick look at the schematic, I figured the IRS2092 supplies (pins 1 & 6) were quite possibly a bit noisy, limiting the dynamics so I slapped some 1500uF/6.3V lytics across the tantalum caps acting as decouplers on those pins. Wow 😀 Now the amp's in the right ballpark and I need to wire up the second channel to have a real listen...
Fed from my transformer isolated TDA1387 DAC, the SQ stock wasn't at all interesting. Having a quick look at the schematic, I figured the IRS2092 supplies (pins 1 & 6) were quite possibly a bit noisy, limiting the dynamics so I slapped some 1500uF/6.3V lytics across the tantalum caps acting as decouplers on those pins. Wow 😀 Now the amp's in the right ballpark and I need to wire up the second channel to have a real listen...
I have both channels wired up now, playing into my newly acquired Paiyon P6s (here on Taobao - https://item.taobao.com/item.htm?spm=a1z10.5-c.w4002-193614789.53.IsbrGA&id=19802659067)
Initially encouraging as the bass dynamics are great - massed strings though are a bit messy, unclear. I need to update the output filter as its designed for a much lower impedance load than I'm currently using (the trafos raise the speaker impedance by a factor of 25). So not placing very much weight on the slightly sub-par HF performance until I've optimized the LC filter.
https://item.taobao.com/item.htm?spm=a1z10.5-c.w4002-193614789.53.IsbrGA&id=19802659067
Initially encouraging as the bass dynamics are great - massed strings though are a bit messy, unclear. I need to update the output filter as its designed for a much lower impedance load than I'm currently using (the trafos raise the speaker impedance by a factor of 25). So not placing very much weight on the slightly sub-par HF performance until I've optimized the LC filter.
https://item.taobao.com/item.htm?spm=a1z10.5-c.w4002-193614789.53.IsbrGA&id=19802659067
Yes, I bought them precisely because those 5.25" drivers look so awesome. They go for over $100 each on Parts Express I think.
The normal price is about 3,800rmb which is around $600 a pair. I got over $100 discount by buying them on 11.11 which is the Taobao equivalent of Black Friday. Mine are the light coloured cabinets.
Back to the amp modules - I've done some more mods now, results are nicely encouraging. Firstly I upped the inductance (22uH -> 120uH) of the output filter to reflect the increased working impedance (now 50ohm). Also upped the series resistance in the zobel (10-> 60ohms) and decreased the output cap (470nF ->100nF). Had a listen and nothing much changed there except that the idle dissipation went up, this turned out to be because the idle frequency went up, so a quick tweak on the pot restored that.
I have explored the schematics of the other amp designs in IRF's range and found this is one of the few without an RC filter feeding into the feedback network to reduce switching noise. So I added one of those (1k/100pF). I also deleted the RF filtering input cap (1nF). Strings are definitely sweeter now, I need more listening as these mods were done late last night and I didn't want to disturb my neighbours.
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Only had phone browser at the time and it did not show P6 price, only P4 and others on whatever currency units were (not even sure what country or language it was in). $600 or $500 with discount is not a bad price considering those are pricey drivers.
Since I don't see this answered further down the thread - that is a non-polarized temperature output as per the Parts Express Datasheet.
It leads to a bead-type NTC thermistor whose value is ~10k ohms at 25c, falling to ~5k at 45c, and ~1k at 90c.
Here's a nice contender for normal applications:
Sure Electronics AA-AB32291 2x250W IRS2092 Class-D Amplifier Board
I wouldn't drive 4 ohm subs at high levels an +- 80v rails.
I would think a nice speaker match would be a DIY with 8ohm woofers and 4-6 ohm tweeters. However, with my Faital HF140\142 combo I use a little CD compensation EQ. With the cheap module I'm using that isn't needed.
Again, synergy is the key.
Sure Electronics AA-AB32291 2x250W IRS2092 Class-D Amplifier Board
I wouldn't drive 4 ohm subs at high levels an +- 80v rails.
I would think a nice speaker match would be a DIY with 8ohm woofers and 4-6 ohm tweeters. However, with my Faital HF140\142 combo I use a little CD compensation EQ. With the cheap module I'm using that isn't needed.
Again, synergy is the key.
What do you guys think of this SMPS for $30?
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AliExpress Mobile - Global Online Shopping for Apparel, Phones, Computers, Electronics, Fashion and more
might be good for this amp:
TDA8950 120 Watt + 120 Watt Class d Verstrkerplatine Mini hochleistungsverstrker Bord in Tda8950 120w+120w class d verstrker brett mit hoher endstufe bordBeschreibung:- da8950th hoch- Effizienz class d aus Verstrker auf AliExpress.com | Alibaba
And this amp might be good for a subwoofer especially when modded to BTL.
The mod should be easy according to the datasheet of the chip
TDA8950 120 Watt + 120 Watt Class d Verstrkerplatine Mini hochleistungsverstrker Bord in Tda8950 120w+120w class d verstrker brett mit hoher endstufe bordBeschreibung:- da8950th hoch- Effizienz class d aus Verstrker auf AliExpress.com | Alibaba
And this amp might be good for a subwoofer especially when modded to BTL.
The mod should be easy according to the datasheet of the chip
It got the best of me and I pulled out my prototype case and started to set one up..
Now going back through the wiring to figure out which is which... Will start with a mains interrupt switch then try to move on to the soft standby mode...
Sent from my Nexus 4 using Tapatalk
Now going back through the wiring to figure out which is which... Will start with a mains interrupt switch then try to move on to the soft standby mode...
Sent from my Nexus 4 using Tapatalk
That's a big case for a little amp and ps. 🙂
Did your Abletec come with the pigtail wire header pins? That would have been a nice feature to get.
Did your Abletec come with the pigtail wire header pins? That would have been a nice feature to get.