If you put them in with the right orientation, which is no easy task, as they fit right and wrong, the worst thing that can happen, you will not hear any difference. Eelectrically they work in the same spot / conditions.
Chances are good you will hear something, because most China amp´s have fake NE5532 for a obvious reason: It is an expensive, high quality OP-amp.
So you might hear the difference of some NE5532 labeled 2 Cent OP amp to your expensive OP amp. Well, only if it is no fake opa2604, like the ones from eBay.
In that case (eBay) you might hear no difference...
Confusing, isn´t it?
Chances are good you will hear something, because most China amp´s have fake NE5532 for a obvious reason: It is an expensive, high quality OP-amp.
So you might hear the difference of some NE5532 labeled 2 Cent OP amp to your expensive OP amp. Well, only if it is no fake opa2604, like the ones from eBay.
In that case (eBay) you might hear no difference...
Confusing, isn´t it?
I've already swapped them, I'm more worried about the instability mentioned here
than orientation. The Opa2604 is from a local store. I've been promised it is real. And there is an audible difference.
The ne5532 came with the unit is quite harsh, overly bright. The Opa2604 takes that edge away, sounds warmer and more musical.
than orientation. The Opa2604 is from a local store. I've been promised it is real. And there is an audible difference.
The ne5532 came with the unit is quite harsh, overly bright. The Opa2604 takes that edge away, sounds warmer and more musical.
Hello,
Today I recieved my FX502PRO. As expected, it sounded far too bright as standard, with a recessed and somwhat muddy midrange. I bought some LME49720NA op-amps from a reputable source and quickly replaced the "NE5532" op-amps. The replacement was very easy using tweezers to pull the old op-amps out and slot the new ones in. The amp now sounds much better! Much less sibilant and the midrange has been brought forward. I think it's still a tad bright at times, but it is certainly far better than standard.
Here is what mine looks like - V5 board:
I did notice it seems to get warmer now with the op-amps changed. Anything to worry about?
Today I recieved my FX502PRO. As expected, it sounded far too bright as standard, with a recessed and somwhat muddy midrange. I bought some LME49720NA op-amps from a reputable source and quickly replaced the "NE5532" op-amps. The replacement was very easy using tweezers to pull the old op-amps out and slot the new ones in. The amp now sounds much better! Much less sibilant and the midrange has been brought forward. I think it's still a tad bright at times, but it is certainly far better than standard.
Here is what mine looks like - V5 board:
I did notice it seems to get warmer now with the op-amps changed. Anything to worry about?
Last edited:
...so don´t worry....enjoyHi
Available at Amazon - just type in TPA3250 (FXaudio - FX502sPro) about 65 Euro with PSU - or you buy at Alixpress 45 Euro with PSU.
without PSU - 34 euro !
2019 FX Audio Neue FX 502SPRO HiFi 2,0 Volle Digitale Audio Power Verstarker Annahme TPA3250 High Power 70W * 2-in Verstarker aus Verbraucherelektronik bei Aliexpress.com | Alibaba Gruppe
chris
Last edited:
Has anyone looked into this TPA3255D product from Fosi?
M03 Subwoofer Amplifier 300 Watt Mini Mono Audio Amp Full-Frequency an
– Fosi Audio
M03 Subwoofer Amplifier 300 Watt Mini Mono Audio Amp Full-Frequency an
– Fosi Audio
It is mentioned in user reviews section: here:
However Icepower 50ASX2 (SE version) should sound much better. If you are DIY kind, it is a better option. You will pay the same as for FX with a quality PSU, as Icepower has PSU built-in. Add couple bucks more for a case. It doesn't have volume control and it must be driven directly from a DAC or a pre-amp with low impedance (no pots between). I have both FX-502S Pro and 125ASX2 and Icepower outperforms FX by a big margin. More clean and analytical, no coloration. 50ASX2 should sound very similar.
Last edited:
Not yet, FX is still sealed. It would be interesting to compare a modded version, but for me ordering small parts comes out costly, as normally I have to use courier services. I have to combine purchases into a bigger pack or arrange a private delivery, but it takes a time. I ordered FX first, but "my private courier services" were delayed for 3 months, so I decided to add to the parcel the Icepower module and both have arrived in the same time. As I am going to replace Topping D30 with PhiDAC, I will try to get parts for modding in the same time.
I'd like to add, putting the Icepower module in a box do not require any specials electronic skills, even a soldering skills - crimping tool is needed instead, it may be problematic. Here is on my desk, FX behind:
Attachments
Last edited:
If you are really honest, the ICE power modules are something like "final amps".
When they were new any review came to the conclusion that they where on par or outperformed any amp of any class, independent of price.
This is still true. There are, in general no amps that "sound better" than an ICE module.
There may be some combinations, which give another amp a tiny advantage over them, but if you just connect a "normal" passive speaker, there is no other concept you may "hypex" about. As ICE does not serve the DIYS, there are, off course, others who want to eat from the free cake. Their claims are just as honest as commercials for laundry detergent, "FX cleans the sound even better" or "Hypex brings out the colors of your CD". Just sales talk.
Today, from a very low entry price, to many thousand $ amps, the speaker you connect and the input signal you have are 95% of the hear able difference.
There are people raving the internet about amps, but if you ask, they don´t even know how many Bit their MP3 reverence music has. The commercial sellers love such folks, keep them stupid, sell them new.
The FX? Yes, you may get an amp as good as the ICE, if you are sure to remove quality degrading China fake OP-amps. If the power supply for the TPA3250 is good enough and the level exactly the same, you will hear no difference in sound you can reproduce. I´m 99.9% sure.
Just one catch,the ICE modules are no finished amps. If your pre-amp have a low enough output impedance (around or sub 600 ohms), anything is OK. If not, you need a buffer stage. Passive pre-amps are a way to get the worst out of an ICE module.
PS most that believe some new amps sound better, have, while hearing them, switched to active speakers or DSP´s. So they do not comment on the amps quality, but on frequency dividers and room corrections.
When they were new any review came to the conclusion that they where on par or outperformed any amp of any class, independent of price.
This is still true. There are, in general no amps that "sound better" than an ICE module.
There may be some combinations, which give another amp a tiny advantage over them, but if you just connect a "normal" passive speaker, there is no other concept you may "hypex" about. As ICE does not serve the DIYS, there are, off course, others who want to eat from the free cake. Their claims are just as honest as commercials for laundry detergent, "FX cleans the sound even better" or "Hypex brings out the colors of your CD". Just sales talk.
Today, from a very low entry price, to many thousand $ amps, the speaker you connect and the input signal you have are 95% of the hear able difference.
There are people raving the internet about amps, but if you ask, they don´t even know how many Bit their MP3 reverence music has. The commercial sellers love such folks, keep them stupid, sell them new.
The FX? Yes, you may get an amp as good as the ICE, if you are sure to remove quality degrading China fake OP-amps. If the power supply for the TPA3250 is good enough and the level exactly the same, you will hear no difference in sound you can reproduce. I´m 99.9% sure.
Just one catch,the ICE modules are no finished amps. If your pre-amp have a low enough output impedance (around or sub 600 ohms), anything is OK. If not, you need a buffer stage. Passive pre-amps are a way to get the worst out of an ICE module.
PS most that believe some new amps sound better, have, while hearing them, switched to active speakers or DSP´s. So they do not comment on the amps quality, but on frequency dividers and room corrections.
Last edited:
After this change I measured output voltage from LM317 and it equal 16.4v. And I take attention that R41 is 300 Ohm! This is mean that factory change R41 from 240Ohm to 300Ohm. Should I go back to 4.3k R40 or 16V is normal?
P.S. Also I made additional holes for cooling.
P.S. Also I made additional holes for cooling.
Attachments
Last edited:
