Any experiences with Power Supplies or similar?
The switching frequency for the meanwell is quite close to the auible band in my oppinion so any comments on PSU choice is appreciated.
This is absolutely an excellent and fundamental question to which I don't have any answer right now.
I'll also need one to put in the chassis with the v2 PCB.
Regards,
I actually got the chassis from someone on another audio forum. It was designed for the Pass B1, but I thought it would work well with this amp.
Thanks for the advice on the pot, but I will probably try it stock at first, with a short shaft connecting the knob to the pot. Or I'll just leave the top off for a while and reach in if needed.
Thanks for the advice on the pot, but I will probably try it stock at first, with a short shaft connecting the knob to the pot. Or I'll just leave the top off for a while and reach in if needed.
MeanWell sounds great
There is theory and then there is trying things. The MeanWell S-350 power supplies sound so much better than a linear supply it is unbelievable. With my Sure 2X100, it is like it is a different amp.Any experiences with Power Supplies or similar?
The switching frequency for the meanwell is quite close to the auible band in my oppinion so any comments on PSU choice is appreciated
Your right, but still. 25khz is very close to audible. I've used laptop SMPS'es that switch around 40-60khz with nice results.
Faster switching would also charge caps better/faster = better bass response?
In theory it might be nice to use a PSU with switching frequency well above audible but away from the switching frequency of the amp, or?
Can I put the MeanWell in a wooden box or the base have to be metal/aluminum?
Theory
Our loss.
Those Italian supplies do look nice though and probably wouldn't sound any worse than the MeanWell. I have read mixed results from using cheap computer and printer bricks. Some of those might be ok and others sound terrible.
Theory often keeps us from trying things that we think we already know the outcome of or makes us think all (fill in the blank) sounds "The Same".
Our loss.
Those Italian supplies do look nice though and probably wouldn't sound any worse than the MeanWell. I have read mixed results from using cheap computer and printer bricks. Some of those might be ok and others sound terrible.
The Meanwell SP series (e.g., the 240 watt SP-240) has a higher switching frequency (90-100khz). However, there aren't any clone versions available on E-Bay (at any rate, I haven't seen any) and the "official" units that electronics dealers have on sale are more expensive ($60-70).
S-320
If can find a S-320 for $70 I will try it to hear if there is any difference. At $40 the S-350 is a steal for active cross 5 way users and they sound great. I guess the price is the thing that gets me most excited about them. That is cheaper than a good transformer.
If can find a S-320 for $70 I will try it to hear if there is any difference. At $40 the S-350 is a steal for active cross 5 way users and they sound great. I guess the price is the thing that gets me most excited about them. That is cheaper than a good transformer.
Yes the SP or s-320 series looks interesting.
I think many of you are buying way too big PSUs. It is like the trend of buying 500-1000watts PSU for you pc, but my fairly high-end pc only draws 162watts from the socket although online calculators and AMD claim I need at east 420watt PSU.
It is more fruitful to dimension you PSU to the correct load as the effeciency is optimal in a fairly small range and usually near its max rating.
Many of your calculations seem to neglect that music signal only consumes around 1/10th of what you calculate using ohms law (hence the low power consumption if you measure practical amperage usage vs. caldulated).
I think many of you are buying way too big PSUs. It is like the trend of buying 500-1000watts PSU for you pc, but my fairly high-end pc only draws 162watts from the socket although online calculators and AMD claim I need at east 420watt PSU.
It is more fruitful to dimension you PSU to the correct load as the effeciency is optimal in a fairly small range and usually near its max rating.
Many of your calculations seem to neglect that music signal only consumes around 1/10th of what you calculate using ohms law (hence the low power consumption if you measure practical amperage usage vs. caldulated).
Big
With a price like that of the S-350, when it comes to power supplies, the bigger the better. Those power supplies control the TK2050 amps like an elephant giving a ride to a flea. Effortless transparency.
This debate came up earlier - see pages 11 and 12 of this thread. It seems that 230 watts or so is the minimum for getting the best performance from this amp (assuming you're feeding it the highest recommended voltage). On paper, anyway - real life usage is another matter.
I am pretty sure this applies for all switch mode powersupplies Power Supply Fundamentals | silentpcreview.com
It would be interesting if someone with the T-amp would measure power consumption at the socket at moderate/party level.
There is such a thing as overkill
In this case it is not just a waste of money, but also a waste of energy (partially the point of class-D amps besides the very good SQ).
It would be interesting if someone with the T-amp would measure power consumption at the socket at moderate/party level.
There is such a thing as overkill
In this case it is not just a waste of money, but also a waste of energy (partially the point of class-D amps besides the very good SQ).
Could you explain the basis for this statement? Not because I disagree, but if you know of a better means of calculating how much current a particular T-amp will need under a given set of circumstances, then I'm interested.
The assumption seems to be that a certain amount of "headroom" is necessary for these amps to perform at their best, regardless of how much current they actually consume.
12%
We are talking a maximum of 12% efficiency loss in the worst case. Who wants to throw away sound and pay more for a supply because of 12%. Come to think of it, most of that loss in the Enermax PSU may be because of a fan that is running all of the time. The fan in the Meanwell never runs and the temp inside the case is a cool 32C. I can't find any efficiency charts for the S-350 so we don't know what it is doing. It may be up in the 5% range judging from the minimal heat it gives off. If you know of a better deal than 350 watts for $40, I will start recommending that one. The S-350 just happens to be the most common and mass produced so it has an unbeatable price. The SE-200-27 would probably also sound good if you want something smaller to fit in a case if you can find one. It will cost a lot more. For some reason the smaller S type power supplies are only common in voltages up to 24v. Too low. I run 32v in my Sure board. The v2 amp is set up for 30v.
.
My Sure 2X100 measures 170ma at 32vdc at idle. Stock. It is 270ma at idle with the mods which include another regulator for the fan and hot running, low value, Wurth XXL coils. I haven't measured again since changing to the Zalman fanless heatsink. That amp was 330ma when playing loudly.
I am pretty sure this applies for all switch mode powersupplies Power Supply Fundamentals | silentpcreview.com
It would be interesting if someone with the T-amp would measure power consumption at the socket at moderate/party level.
There is such a thing as overkill
In this case it is not just a waste of money, but also a waste of energy (partially the point of class-D amps besides the very good SQ).
We are talking a maximum of 12% efficiency loss in the worst case. Who wants to throw away sound and pay more for a supply because of 12%. Come to think of it, most of that loss in the Enermax PSU may be because of a fan that is running all of the time. The fan in the Meanwell never runs and the temp inside the case is a cool 32C. I can't find any efficiency charts for the S-350 so we don't know what it is doing. It may be up in the 5% range judging from the minimal heat it gives off. If you know of a better deal than 350 watts for $40, I will start recommending that one. The S-350 just happens to be the most common and mass produced so it has an unbeatable price. The SE-200-27 would probably also sound good if you want something smaller to fit in a case if you can find one. It will cost a lot more. For some reason the smaller S type power supplies are only common in voltages up to 24v. Too low. I run 32v in my Sure board. The v2 amp is set up for 30v.
.
My Sure 2X100 measures 170ma at 32vdc at idle. Stock. It is 270ma at idle with the mods which include another regulator for the fan and hot running, low value, Wurth XXL coils. I haven't measured again since changing to the Zalman fanless heatsink. That amp was 330ma when playing loudly.
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Whoa...Take it easy guys...This sure aint Rocket Science..I run my Sure Board into (4) 8 Ohm Speakers till the Windows Rattle, on a $15 HP 31.5v..3.17A Brick...What's the Big Deal? And if I Over Do It..It will cut out, and all I have to do is turn the Power Supply off then back on, at a slightly lower level, and the Tunes Flow again...
This is all it Takes....And 2 Old Pentium Heatsinks..
This is all it Takes....And 2 Old Pentium Heatsinks..
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The CS DAC in the oppo is very good, also for multichannel.
Do you have any comments on this "I haven't quite figured out yet whether all digital is the ultimate solution (like going from VGA to DVI/HDMI). Is all digital (power dac) the pinnacle of quality compared to a nice DAC solution like the CS4397 to a 2050/3020 T-amp or can there still be issues in a ddx amp that will make it come in 2nd vs. the T-amp solution?"
Or comments from the rest of you peeping toms following the thread
Hi, I don't think DDX is the best solution for everyone, but I think it's worth to have a try because it's another way to build personal system. Many DAC can do very good from their parameter, but not all boards take care of their analog design. So DDX could be better in this side according to 'simplest is the best'.
For current version AMu320 board, I didn't find bug for now so it's no necessary to make the 2nd currently.
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