In theory yes, but you'd never drive it to 300 watts. That's at 10% distortion and I can tell you now it sounds horrible, you'd back off before you got there. You'll get about 200 watts per chan into 4 ohms that sounds decent.
The website say its a 500va with the 1000 watt kit as far as I can see. A 500va traffo that's supposed to power a 2x 1000watt into 8 ohm amp is in my opinion a bit on the low side.
However the amp may deliver much less then this into 8 ohms with low distortion, you'd back off before you got to 1000 watts. I don't know how its rated.
If you wanted to supply 1000 watts stereo into dummy loads of 8 ohms with sine waves. Then yes you'd need a 2000va+ transformer.
We don't listen to sine waves, nor do we tend to tolerate high levels of distortion, so for 95% of your listening the 500va transformer would be fine.
There's no problem with using those, however the voltage is a bit low.
If you wired the secondaries in series you'd end up with 26VAC - rectified you're looking at ~35 volts.
Due to the way the amps behave take 10 off that then divide by 1.41 to get the rms voltage output.
V^2/R = Watts RMS this will give with low distortion.
You're looking at 40 watts into 8 ohms and 80 watts into 4 ohms with low distortion.
Give the amps 50 volts (40/1.41)^2 = 800.
This gives you the 100 watts into 8 ohms and 200 watts into 4 ohms. After that distortion shoots up and yes you do get 150 watts into 8 ohms and 300 watts into 4 ohms, but it sounds terrible😱
So 35 volts in to low? I would be better off running them all in series then?
But with a lower primary voltage of course.
Nick
But with a lower primary voltage of course.
Nick
Yes 35 volts is a bit too low if you want to realise the full potential of these chips.
Three secondaries in series will give you 55 volts after rectification. Drop a volt or two for diode losses and you're around 53-54 volts. Lightly loading the transformer will drop that voltage slightly too. The chips state normal operating max voltage as 52.5V, but the absolute max is something like 69.
I'd power up a transformer and see exactly what voltages you get. Here in the UK most transformers have two 115V primaries, wired in series for 230V, so they run a little hot with our 240V mains.
The best thing would be to rectify three secondaries in series + smoothing caps and see what voltage you get. Then you could try placing a light load on the output (something like a 60watt incandescent light bulb) and seeing what voltage you can expect it to run at.
If that's successful then all you need to do is run one of the transformers secondaries in parallel. Then wire that in series with the two secondaries of the other transformer.
Remember to make sure you wire the transformers up correctly, you need to maintain the correct phase relatioinship of the secondaries otherwise you'll get problems.
Hello all.. I've been very busy this week and haven't had a chance to respond to any messages. As for transformer size... there are many opinions regarding the required size of power supply transformers and everyone and every manufacture has theirs. The truth is, the only time the amplifier will be continually sine wave tested is during evaluation. In all other situations, the amplifier will be processing program material. The average currents and power dissipations actually will be 1/8 of power for soft music, 1/4 of power for heavy rock music and 3/8 of power with dead metal music. We have tested and run these amps very hard with the transformers provided with our kits, and with all types of music, and they do not strain, and don't even get warm. The transformers also can handle large peaks for short periods, so playing music has never been a problem for them. We do have 1000VA transformer available... they weigh 18 pounds! The price upgrade is for the 1000VA transformer is $55.00 (plus the extra cost of shipping… 18 LBS!). We are also almost finished with a very high-tech switching power supply that is 600W with peaks of 1200W. It weighs about a pound, and that combined with our amps will provide a system that will rival the best on the market. As for the Toroids, we had to choose something that will perform better than expected, and try to keep the size and weight down to something manageable. I really don't think most want to put a HUGE 18 pound transformer in an enclosure, but for those that do, as I said, we do offer those and any other size you might want... just contact me.
Yep that I can do. I have used these transformer in parallel for quit a few thing. I know in parallel I can pull 80 amps from them without even breaking a sweat so this should be a problem. So 40 amps at 50 vdc 2k watts, not to bad. I will be able to run my whole surround sound system with this LOL.
And I have a 230 volt in 270 out ac 2.4 kva variac with motor drive and a regulator controller to run the motor. So I can monitor the output voltage of the power supply to keep it a constant voltage over load 😀. Oh ya and a nice big isolation transformer for the output too.
It really won't be light though, but then again I like heavy iron. I'm into tubes LOL
Nick
And I have a 230 volt in 270 out ac 2.4 kva variac with motor drive and a regulator controller to run the motor. So I can monitor the output voltage of the power supply to keep it a constant voltage over load 😀. Oh ya and a nice big isolation transformer for the output too.
It really won't be light though, but then again I like heavy iron. I'm into tubes LOL
Nick
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I would take you up on that if I didn't already have all these big honken goodies LOL.😀
Nick
Has anyone heard an IRS2092-based amp? How does it sound? There's little or no info out there than technical...
You can go to our website and read some reviews for amps based on the IRS2092 chip... Class D Audio Home page and click on the Testimonials link at the bottom of the page. Our other series amps (other than the TI) are based on the IRS2092 driver chip and are some of the best on the market.
Tom
I've had two channels working now for a couple of days.
The sound the amps produce is immediately likeable, they provide an extremely pleasing tonal balance that doesn't annoy in any way. There's no hardness to the sound at all and treble sibilants are very smooth.
I've read before that class D amps sound somewhat soft and that's exactly how the TAS5630 sounds to me. Don't take this as a bad thing as I'd see it as one of the selling points, they make music easy to listen to.
Compare against the ~70wpc @ 8ohm Class AB amp, designed by Randy Slone that I've got and it's clear that the Slone amp wins. A lot of the softness in the treble is removed and things like cymbals shimmer in a more pleasing manner. I'm not going to keep waffling on about how they sound, needless to say the two amps sound quite different.
In the bass they sound great mind you and will easily suit the task I built them for.
Of course one could improve the TAS5630 design that I've built by changing the power supply to something better. I've got a simple LM317/337 +12/-12 supply powering the opamps and the +12v side of the amp chips. A super regulator would no doubt sound better, but is overkill for my application.
The bottom line is I can't imagine anyone being unsatisfied with the way they sound and a bunch of them would do great I think in a HT setup.
The sound the amps produce is immediately likeable, they provide an extremely pleasing tonal balance that doesn't annoy in any way. There's no hardness to the sound at all and treble sibilants are very smooth.
I've read before that class D amps sound somewhat soft and that's exactly how the TAS5630 sounds to me. Don't take this as a bad thing as I'd see it as one of the selling points, they make music easy to listen to.
Compare against the ~70wpc @ 8ohm Class AB amp, designed by Randy Slone that I've got and it's clear that the Slone amp wins. A lot of the softness in the treble is removed and things like cymbals shimmer in a more pleasing manner. I'm not going to keep waffling on about how they sound, needless to say the two amps sound quite different.
In the bass they sound great mind you and will easily suit the task I built them for.
Of course one could improve the TAS5630 design that I've built by changing the power supply to something better. I've got a simple LM317/337 +12/-12 supply powering the opamps and the +12v side of the amp chips. A super regulator would no doubt sound better, but is overkill for my application.
The bottom line is I can't imagine anyone being unsatisfied with the way they sound and a bunch of them would do great I think in a HT setup.
Came across some measurements and observations of one of the ClassDAudio amps by one of the resident gurus over at 41hz. Gives some pros and cons about the design (tho I don't believe he actually listened to it). However, what caught my attention was the possible heat issue. I hope this is not something to be worried about!
What he shows is the Class D I.R. based board. This is not the board we are discussing here which is the T.I. CLass D board. Tom does however feel the I.R. based board sounds better then the T.I. does... I also do know that the alumnium bar provided on that board is there to couple to a larger heat sink if required. Under normal music use I doubt that board gets very hot. BTW: He has a very nice spectrum analyzer and I trust what it's saying!!!
Mark
Mark
Hi Mark, are you using this amp in Bridged mode or Stereo mode, thanks 🙂
Also, have you had any EMF interference issues with this amp (eg. EMF interference of your FM radio, etc)
🙂
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Stereo mode is bridged mode.
The single ended application, where you get 4 individual output channels, is unbridged.
Stereo, pairs two output channels together, BTL.
Mono mode ties all four output channels together to give more current capability. But the output voltage maximum is the same in PBTL as it is in BTL.
Kle,
I'm running in stereo mode. Don't have any FM or AM here in the house so can't answer that... Doesn't interfer with the TV at all. Radio here is not worth the time spent IMHO because much of the programming in SLC is pretty ransid.
I am running this amp module: Class D Audio 600W Class D Power Amplifier, Balanced Input, 2 Ohm
Mark
I'm running in stereo mode. Don't have any FM or AM here in the house so can't answer that... Doesn't interfer with the TV at all. Radio here is not worth the time spent IMHO because much of the programming in SLC is pretty ransid.
I am running this amp module: Class D Audio 600W Class D Power Amplifier, Balanced Input, 2 Ohm
Mark
Hi Tom (and All), just wondering if you can tell me what the PSRR of the input stage is and if you are producing (or have produced) an SMPS for this amp.
Also, what does bus pumping do and why is it a benefit that it is never an issue with this amp?
thanks
🙂
I know that this thread is focused on the T.I board but I have just gotten the 2X250W IR kit up and running and my impressions so far is much like what you've described for the T.I. Immediately likeable, smooth, full-bodied, and dynamic. My only gripe is it is a little too rolled off at the top as well. I find myself using the treble processing on my receiver/preamp instead of the source/pure direct that I prefer. I have diy low distortion 4 ohm mtm towers and will reduce the tweeter padding to see if that will balance things out a bit. Other than that I like what I hear. Very seductive sound. Horns and keys are syrupy sweet!
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Well, even Tom admits there is a bit of a difference between the sound of the two boards. I'd be curious if you could measure the frequency resonse so we can see if it is indeed rollrd off or not. I'll do the same with the T.I. board but it might be a couple of days. Oh and does yours get hot like it did for the guy over at 41hz?
Mark
Mark
You know I haven't checked the heat on the board, except to hover my palm over it for a few seconds. It was only slightly warm. I'll take a closer look tonight. I certainly didn't detect a "funny smell" after a few minutes as V-bro did...
I do not have a measurement setup alas. It's possible that it's so clean in terms of noise and HF that I just need to adjust my ears, I'll have to do some playing around w/ different sources and the mtm crossover to be sure.
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