Now I'm not 100% sure on this whether Sonetto II G2 is the actual reason behind such strange crackling sound from JBL 625C or it's something else?
When I connect this JBL 625C into the Front Right connector behind the A/V receiver, I don’t hear crackling sound anymore, atleast from what I have observed after playing songs on YouTube or watch couple of movies on Disney+ Hotstar.
That is a good troubleshooting step obviously, but you should also try connecting the cheapest speaker you have to the center channel and see if you get the crackling, don't do that with you more expensive speakers.
It is also possible that you have a bad/loose banana connector, or as you mentioned, something wrong at the connection for the center channel inside the receiver.
Would all of you have any idea about this issue & how to fix it?
You need to complete your troubleshooting steps to determine the cause first, before talking about fixing it.
I am interested to purchase Marantz Cinema 50 & a 2 channel Power Amp RB-1552 MkII from Rotel Audio.
I want to power the front Sonetto II G2 Left + Right power hungry demanding speakers using this Rotel Audio Power Amp (2 x 130 Watts) while the centre speaker & all others will be powered by Cinema 50.
By this means, all the connected speakers into this A/V receiver & Rotel 2-channels Power Amp, should receive their rights of appropriate power so as to give me a detailed most cleaned sound quality. What are your thoughts on it?
As mentioned before, those low output Rotel amps is not going to help much, if you want to get the best out of those very nice Sonus Faber speakers, do them a favor, get an amp rated at least 250 W rated into 4 ohms, such as those class D amps recommended before.
Also, the center channel usually demand as much or more than the front left/right channels do for many movie tracks. So you may want to consider a 3 channel amp or a 2 channel one plus a monblock for the center.
The Marantz Cinema 50 is a fine AVR, same as the AVR-X3800H, almost identical except for the aesthetic so if price is right, go for it.
Also there are 2 connectors behind JBL 660P Subwoofer. I noticed when I insert the Sub-woofer Nedis Audio cable into the white connector, the Subwoofer doesn’t output sound nor does it sound under the Test tone in Yamaha RX-V685 A/V receiver’s setup. However, if I insert the same audio cable into the Red connector, I can hear Sub-woofer boom boom sound & works under Test tone as well but the problem is that earlier, it’s bass impact was too good but now, I have to take the A/V receiver’s volume level all the way to -5 to -3 to hear it’s sound under the Receiver’s test tone in setup.
There are usually 2 options, a) if you connect the subwoofer to the LFE (subout) of the AVR, you would use one connector, not sure if it should be the red or white, probably the red if you are getting sound there, or b) if you connect the subwoofer to the pre out of the Yamaha, such as the front left/right then you would use the other connector. If the JBL manual does not say that clearly then you will to just try different ways to find out what it is. Again, it is likely that the red terminal would be the one to use for connection to the sub out of the AVR.
Also earlier even at -32, the punchy effect of JBL 660P Sub was quite good but now, I have to take the volume level all the way to -23 to feel the same effect. I strongly feel after the crackling sound of JBL 625C Center channel, the sub-woofer’s punchy sound has also been reduced.
Did you make any other changes that could affect the level of the subwoofer? Such as, re-running YPAO?
Any help or guidance here will be much appreciable as I am totally clueless at this point whether the issue is with:
a) The Power Hungry Sonus Faber Sonetto II G2 Bookshelf speakers of 4 Ohms
or
b) The A/V receiver is of entry level not being able to meet the power demand of all the connected speakers.
or
c) The Center Channel connector at the back of Yamaha A/V receiver.
or
d) JBL 625C itself.
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All of those factors you mentioned are the possible cause(s), the entry level AVR is definitely only suitable for use with those Sonus speakers if you don't listen loud, sitting close to them such as less than 10 feet (even 6-8 ft better). And again the Rotel amp you pick won't help much, but a little for sure.
