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Review and Measurements of Topping TP60 and FX Audio FX502SPro Amps

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What where the size of the power supply for the fx audio voltage and amps ?

I comes with a 32 volt 4.5 a and should have much than 37 watt in 4 ohm if they used that power supply
 
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BlackLion

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I remembered that when I hear extreme distortions from amplifier, it's usually ground loop. Perhaps, the extreme distortions were caused by a ground loop. And, you unwittingly removed it somehow.
 
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So what is the pick budget mini amplifier that performs greater than expected? Doesn't have to be mini, just cheap, pound for pound as we say over here :) Plenty of power would be a bonus
 

daftcombo

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So what is the pick budget mini amplifier that performs greater than expected? Doesn't have to be mini, just cheap, pound for pound as we say over here :) Plenty of power would be a bonus
I'm afraid that remains to be discovered.
Or if you need just 5W, a Topping A90?
 

sychan

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It isn't really a consumer product, more like an audio hobbyist item, but the guys at Allo have a cheap, mostly plug and play amp:
https://allo.com/sparky/volt-plus-stepped-attenuator.html

Allo's gear generally seems to be pretty solid when measured here in ASR (looking forward to seeing if Amir will be able to review the new Revolution DAC from Allo). By reputation, the Allo Volt is clean and very resolving. I have a Volt+D and it sounds extremely clean and detailed to me (subjectively) but I don't have instrumentation to measure things.
 
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I'm afraid that remains to be discovered.
Or if you need just 5W, a Topping A90?
hmm, 5 watts I cant live with unfortunately. There must be something surely, how about a S..M.S.L 98e ? lots of power but I suspect the same sort of thing as whats on offer in the initial test here.
It isn't really a consumer product, more like an audio hobbyist item, but the guys at Allo have a cheap, mostly plug and play amp:
https://allo.com/sparky/volt-plus-stepped-attenuator.html

Allo's gear generally seems to be pretty solid when measured here in ASR (looking forward to seeing if Amir will be able to review the new Revolution DAC from Allo). By reputation, the Allo Volt is clean and very resolving. I have a Volt+D and it sounds extremely clean and detailed to me (subjectively) but I don't have instrumentation to measure things.
Interesting product looks really good especially with the step attenuator. But I do think I need more power these days there is nothing like having a good bit of drive in it if you need it.
 
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I'm attracted to ABGN Hot-Tpa3255 because it is more powerful and uses a more recent amp chipset. What kinds of power supply do you recommend for this? The seller recommends 30V 6A although I may want more power to create headroom for Eltax Monitor 1.
you would be better to look at the original Aiyima A07 TPA3255 version with the two Power Supply Capacitors. This version above seems like a cost reduced version and I would not bother !!

For Power Supplies the Mean Well LRS-200-24 or LRS-200-36 seem to work well with these amplifiers.
 

miv

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Not sure if anyone is visiting this thread at this point, but here goes:

I have in front of me an FX502SPRO and a pair of OPA228P op amps. My understanding is that 1) the op amps in the FX are not soldered in - are meant to be replaceable - and 2) that the OPA228P are an appropriate replacement. I'm less sure about 2), though, and wondering whether anyone has any insight.....

As to whether these would make any difference sonically: Heck (pardon language), they can't do any harm in that respect that can't be reversed, so long as nothing fries or melts.

The frying/melting thing is my obvious concern...... if I survived, I'd be without a desktop amp for the weeks it took for something else to arrive from China.

(Asking here for environmental reasons - minimising the unsustainable proliferation of low-interest threads.)
 

Xyrium

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Sorry, I have no insight, but I haven't noticed anything from changing Op Amps on my old Asus STX. Of course, that board didn't fare well here, so I'm not sure it would have mattered. The way I look at it is, if an Op Amp would have made even a measurably appreciable difference, most manufacturers would have implemented the "better" one, in most cases, due to the minimal financial outlay across the Op Amp portfolio available.

Hopefully someone more knowledgeable can reply. However, my stance is that given the price of the product in question, I wouldn't waste my time on it with an upgrade, or perhaps, side grade, like this if I'd be out of a system when if the magic smoke is released. ;)
 

somebodyelse

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Search for 'opamp' in thread titles - the general topic has come up a few times in slightly different contexts. My summary: it rarely results in a measurable improvement, and there's a risk of possibly-damaging side effects, notably oscillation and DC offset. Unless you've got a way to blind test modified vs. unmodified with quick switching you won't be able to tell whether you can actually hear any difference, or of it's all in your head.

Having said that you'll _probably_ get away without lasting damage to the amp, so if it's a risk you're prepared to take then why not, in true "take nobody's word for it" style. Just remember that it's easy to fool yourself if you aren't rigorous about the listening tests (level matching, blind, fast changeover etc.)
 

miv

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most manufacturers would have implemented the "better" one, in most cases, due to the minimal financial outlay across the Op Amp portfolio available.
\ I see where you're coming from there - but given that the op amp that comes in the FX amp is being sold at 50 pc /$2.27 US (4.5 c each!!) on ebay, and that the OPA228P costs almost 100 times that (!!!)....er,......well, to be honest, I don't really know what point I want to make...
 

miv

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Having said that you'll _probably_ get away without lasting damage to the amp,

"Probably" will be good enough, I guess, when the project is rendered pointless by my having acquired a better amp. (Akin to last year's project of replacing the camera in my beloved Blackberry Z30 after I'd crumbled morally, jumped ship and bought a used LG V20. At least it's whole again, as it sleeps - probs - the big sleep in a desk drawer.)

I've ended up with two OPA228Ps because they were flagged (somewhere, by someone) as an appropriate replacement for some other op amp that was likewise flagged (somewhere else, by someone else.....) as an appropriate replacement for the NE5532 that comes in the FX502SPRO. If I remember correctly.
 

somebodyelse

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I've ended up with two OPA228Ps because they were flagged (somewhere, by someone) as an appropriate replacement for some other op amp that was likewise flagged (somewhere else, by someone else.....) as an appropriate replacement for the NE5532 that comes in the FX502SPRO. If I remember correctly.
IIRC TI use the NE5532 in their eval board to get full datasheet performance out of the power amp chip. The FX502SPRO falls short of that performance, probably due to cost cutting in PSU caps and output inductors as well as PCB layout. While this is understandable given the price, it also means the opamp isn't likely to be the limiting factor - unless they've gone for an off-brand 5532 too.
 
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