I agree, also to understand if it is a placebo effect or real
Wiim Pro+ OPAMP replace
- Thread starter zacci
- Start date
not only placebo..but better or not etc..
No
Hello! For me, after replacing the opa (1611), the pro plus does the following: if I turn it on with the amplifier turned on, after the boot time (45 sec), the speaker pops quite loudly. The problem is that I don't know if he did this before or not...can someone tell me if he does something similar? Anyway, it sounds nice, the sound is definitely better with the 1611 opa.
Please, can someone tell me whether in its factory state, when you start the Pro Plus with the amplifier turned on, is there a pop in the sound after the boot process (about 45 seconds) or not? It annoys me, because I didn't listen to it before the Opa exchange 
anyway, the sound is really great. I was still thinking about whether one of the capacitors should be replaced or some other simple tuning.
anyway, the sound is really great. I was still thinking about whether one of the capacitors should be replaced or some other simple tuning.slartibartfast
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- Apr 18, 2024
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If you didn't listen to it before changing the Op Amp how do you know it sounds better now?Please, can someone tell me whether in its factory state, when you start the Pro Plus with the amplifier turned on, is there a pop in the sound after the boot process (about 45 seconds) or not? It annoys me, because I didn't listen to it before the Opa exchange
Of course I listened. it is clear that it was worth the exchange. (I listen on an ACR ISOSTATIC RP-400 MK2 speaker). I'm only interested in the boot pop, I didn't notice that... I definitely recommend the replacement to everyone, the sound is clearer, more defined, airier, the bass is even more controlled. Now it sounds like it is perfectly on par with my 1000 Euros AKM dacom.
I have just soldered a 5.1nF small K31-11-3 mica capacitor on each 2 VENT 4700uf 10v, the sound becomes more open and without sibilance tendency on high frequencies, both on the analogue and digital output side.Thank you all for your replies!
Soldering is not a problem. I checked pins 7 and 4 and measured 24v voltage. Rev.4 motherboard. It differs from previous versions.
It has 2 VENT 4700uf 10v capacitors. Is this worth changing to Nichicon?
If engineer from Wiim is here, my question would be why did they use a VENT capacitor? Cost savings?
I'm trying to identify the by-pass capacitor on the SA5534, but I don't know exactly which pins it's connected to. Is there any at all? Can someone tell me from a picture?
The dip8 socket would fit in the housing, but it is possible that I will directly solder the new OPA.
It is certainly good news for me that the SMSL su1 also has an AKM4493SEQ DAC, but with a more serious OPA and in principle it sounds better. Then there is also a chance for tuning on the Wiim
Here are some pictures of the rev.4 motherboard:
View attachment 4088
View attachment 4089
I was thinking about doing this classic manipulation in the future but rather with higher values in mkt mks etc ... 470nf, or 1 or 2uf ...
why the choice of such a value?
Or a mica? (which like styroflex is often used more on audio than in power supply..)
the Mica one is not inductive and cleans the spikes very well, they are also called impulse capacitors; the value, I put it because that's the one I had, it can be used very well 220pF also, can try; Nichicon FW are my prefered in Power supply; compared with styroflex, for electrolitique bypass I prefered mica
you will have understood the use of such a small 5nf on a 4700uf surprises me as a use of a mica in this place (even if correlated to the very low value.. mica at 470nf or above are not common).. but if you are satisfied and perceive an improvement in your opinion.. that is the main thing... (but this kind of approach and your values could be studied locally on the power supplies of the aop..but that requires scope and co)
;-)
;-)
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hgo58
Major Contributor
Please tell me how this can change as anything on the digital signal.
I have tried a lot of capacitors over the years for power supplies: WIMA of all types, stiroflex (very nice in RIAA circuits), Duelung, Jantzen superior Z-cap, Silmic II, Miflex copper and my favourite rest Nichicon FW in parallel with Mica; in this case I see that I don't need to change VENT with Nichicon, the bypass was enough; on the digital Mica side it cleans up the spikes that occur at transients, which electrolytic cannot do at high frequencies; you can also use a ceramic which is also non inductive, but it is nonlinear in frequency and spoils the sound
had to do it for a long time..
modest passage in 1611 (which I had in stock anyway and of safe origin ) without problem...
side results, without direct comparison with an unmodified machine I would not say much...
just in toslink input in comparison with a CD player of more than 20 years old quite serious and rigorous .. pro plus remains behind (in particular the aeration on acoustic music)...
(* but without too much effort on power supply side in wiim)
(the treble probably seems to me more "just" and elegant with the 1611 than 5534)
but in my very basic use of my wiim-radio* it was not really justified.. ( more if via toslink headphone/peq)
;-)
just ..to remember..can this be done and remains a reversible manipulation if necessary ;-)
modest passage in 1611 (which I had in stock anyway and of safe origin ) without problem...
side results, without direct comparison with an unmodified machine I would not say much...
just in toslink input in comparison with a CD player of more than 20 years old quite serious and rigorous .. pro plus remains behind (in particular the aeration on acoustic music)...
(* but without too much effort on power supply side in wiim)
(the treble probably seems to me more "just" and elegant with the 1611 than 5534)
but in my very basic use of my wiim-radio* it was not really justified.. ( more if via toslink headphone/peq)
;-)
just ..to remember..can this be done and remains a reversible manipulation if necessary ;-)
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