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ZOUDIO AIO4CH: 4-channel amplifier with DSP and Bluetooth
ZOUDIO AIO4CH: 4-channel amplifier with DSP and Bluetooth
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Old 10th April 2020, 07:06 AM   #101
lutkeveld is offline lutkeveld  Netherlands
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@zerokelvin99
1) Basic limiting (digital range compander) should be available from the next update of the config tool

2) Harmonic bass alignment is only available for large orders unfortunately. The chip supports it, but its too difficult to integrate in my software.

@Joe
Wow, nice! It is indeed amazing how many features it combines in one.
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Old 18th April 2020, 10:18 PM   #102
jjasniew is offline jjasniew  United States
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Quote:
Originally Posted by irribeo View Post
with chinese 12v 6A for "hifi" psu the treble gets a little scratchy compared to very smooth with 15V Mascot 10A, mean to try MeanWell 24V some time soon.
I bought a cheap "garbage" $20 shipped Chinese 24V switching PSU off ebay and found the "scratchy" (for lack of better term) sound on my high pass as well. I've been using a Liteon 19V laptop brick which definitely sounds better than this more recent purchase... So I quit the 24V unit.

I can only guess this has something to do with control loop stability of the LED strip intended PSU, or the switching frequency. I'd say PSUs from a more reputable manufacturer (who may care more about optimizing control loop stability) will give better SQ performance.

Next, I ordered a linear PSU @ 24V, 6A from ebay to try. I paid <$30 for it, shipped, which was competitive with the cost of a pair of 12V, 7Ah batteries. Obviously the batteries have no control loop to offer a less than ideal source impedance over frequency to this amp. I would think they'd make an ideal power supply.

Hopefully, the linear will perform best. For anyone interested, here's the one I picked Acme Electric DC Power Supply Unit, SPS Model 120-24/28, Used, Warranty | eBay - I'll report back on SQ with the 6A linear sometime after it arrives...

I've no idea if the voltage difference (19 vs 25) had anything to do with the SQ perceived difference between the two switching PSUs - but I'm glad to have the 19V Liteon connected back up. The thoughtful inclusion of the reverse polarity protection diode at the PSU input is appreciated!

Bottom line - choose carefully the PSU you're going to run this amp with; dont dismiss it SQ wise without having first run it using a good quality PSU! If there's a sweet spot voltage input wise regarding SQ, I'll gladly set the linear there so long as its pass transistor / heat sink can take it -
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Last edited by jjasniew; 18th April 2020 at 10:28 PM.
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Old 19th April 2020, 07:07 PM   #103
KaffiMann is offline KaffiMann  Norway
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ZOUDIO AIO4CH: 4-channel amplifier with DSP and Bluetooth
I have a plan to get this thing up & running sometime this week.
Looking forward to finally trying it out, was waiting for some DC - DC converters of various make. Got a couple of them in-hand right now, and a Meanwell 15v lots of amps PSU and a small array of batteries just in case.
Not sure what I'll do about a box for it, that's the current holdup. Want to do this at least semi-right.

Nevertheless, if you make some TAS3251 boards like this, I'll take at least 4 if the price is not too bad.
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Old 20th April 2020, 12:30 PM   #104
Solve is offline Solve  Sweden
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My point with PSU that are under powered under the recomended max 24v 7A are you got early distortion if you crank it up.
Yes I hear it.
Why don't max it and get headroom?
As I read the ripple is lower in SMPS when you don't have to max it.
What sounds better linear or SMPS?
Maybe more bottom with my 19v 5A linear PSU compared to my cheap 24v 6A who shutts down after 4A I read.
But I don't have golden ears so no offend.
A boost converter good be a good thing if it sounds better or get more power but it's alwayes at a coast.
Not to blame all of you who hearing things that I don't but if you are the few people that have golden ears and hear things that normal people don't hear you maybe choosed another amp?
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Old 20th April 2020, 07:46 PM   #105
KaffiMann is offline KaffiMann  Norway
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ZOUDIO AIO4CH: 4-channel amplifier with DSP and Bluetooth
I don't understand who you're intending the comment for. I can use voltage regulators to step down to 24-25v from a higher voltage PSU, batteries, linear or SMPS got lots of various voltages... Was just thinking this is a good opportunity to try voltage boosters to use a decent quality 15v SMPS I have that should be a good match. If I want to keep it simple I'll just use a single 12v SLA or if all else fails just two in SLA series with a standard vreg down to the same 25v.

I am going to aim for ca 25v regulated and about 8-10A either way, no point for me to settle with lower voltages.

What's better between linear and SMPS: Depends on design and implementation.
Both have the potential to be fantastic, mediocre or rubbish. And everything in between.
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Old 21st April 2020, 06:00 AM   #106
Solve is offline Solve  Sweden
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Better don't necessarily mean better sound is my experience.
I tried batteries,SMPS,linear between 19-24v and hear no difference except under load
I got distorsion more early with less ampere.
I bought an linear PSU for many years agoe, not cheap but the difference
for ME was negligible.
ZERO-ZONE Hiend 100VA 19V 4.2A Low Noise LPS Linear Power Supply DC PSU | eBay
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Old 21st April 2020, 06:52 AM   #107
jjasniew is offline jjasniew  United States
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That's over $200 just for the power supply? I thought the amp was supposed to be the expensive part...

We'll see if I can hear any difference with the $30 linear I have coming from ebay.

One consideration is I leave the power supply part energized 24/7 and just use the push-on rotary control on the Zoudio. So the power supply needs to be OK with quite close to Zero load current. The laptop power supply is all set to be able to do that, so it's pretty convenient that way. The linear is this industrial thing, probably meant to run 24/7 also and probably has zero issue with no load. Or is that no issue with zero load.

KaffiMann - I used a case like this; Enclosure Electronics Project Case Instrument Circuit Shell 200 x 175 x 70mm Box | eBay

Pretty much just used the stick-on feet that came with the amp, made holes for the power LED, Volume/Function knob and the 3.5 mm stereo input. There's plenty of room to mount speaker connectors in the back, but I wired the 4 cables directly to the amp. The light plastic enclosure with the light amp in it moves when you press on the knob to turn it on! Better than nothing.
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Old 21st April 2020, 07:19 AM   #108
Solve is offline Solve  Sweden
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Quote:
Originally Posted by jjasniew View Post
That's over $200 just for the power supply? I thought the amp was supposed to be the expensive part...

We'll see if I can hear any difference with the $30 linear I have coming from ebay.

One consideration is I leave the power supply part energized 24/7 and just use the push-on rotary control on the Zoudio. So the power supply needs to be OK with quite close to Zero load current. The laptop power supply is all set to be able to do that, so it's pretty convenient that way. The linear is this industrial thing, probably meant to run 24/7 also and probably has zero issue with no load. Or is that no issue with zero load.

KaffiMann - I used a case like this; Enclosure Electronics Project Case Instrument Circuit Shell 200 x 175 x 70mm Box | eBay

Pretty much just used the stick-on feet that came with the amp, made holes for the power LED, Volume/Function knob and the 3.5 mm stereo input. There's plenty of room to mount speaker connectors in the back, but I wired the 4 cables directly to the amp. The light plastic enclosure with the light amp in it moves when you press on the knob to turn it on! Better than nothing.
Thats my point, an $200 PSU is not worth it, I bought it 2012 when reading all people raving about difference in PSU and sure I got better bottom than my cheap power adapter but my cheap 24v 6A $30 SMPS sounds the same.
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Old 21st April 2020, 09:10 AM   #109
KaffiMann is offline KaffiMann  Norway
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ZOUDIO AIO4CH: 4-channel amplifier with DSP and Bluetooth
Not sure if I understand what you're complaining about. You're saying that you achieved sub-par performance using a sub-par psu, and that using a psu that has good rail stability under load is very important...?

I'm sorry, but that is merely stating the painfully obvious. The recommended minimum spec for a 24v psu is 7 amps. It's a given that you'd run into issues on transients when using a 24v 4a capable brick. I would expect that if you want this 4ch amplifier to perform properly on peaks with a mixed 8ohm + 4ohm load (2*30w 8ohm + 2*60w 4ohm), you need an at the very least 200w capable psu at 24v. Not including losses.
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Old 21st April 2020, 10:30 AM   #110
Solve is offline Solve  Sweden
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"sub-par performance using a sub-par psu"
Whats does that mean?Never heard of beore.
And I linked twice in this thread to an 200w SMPS that I think do the job....
Maybe I took it for obvious that people read the min spec...
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