Problems with sound on the new acoustics?

Question

Iron

Once upon a time there was a working machine - Mac Mini 2011.
The sound from it was output to an ordinary average music center. I wanted to improve the sound quality. As a result, a set of DENON AVR-1513 (receiver) + JAMO S604 + JAMO SUB210 was purchased. The receiver produces a maximum of 110W per channel, shelf speakers recommended 70W, maximum 130W, subwoofer - 210W.
In an impatience to feel all the advantages, speaker wires were cut, twisted at the ends (but not tinned), everything was tucked in and turned on analogously (3.5 "- 2RCA) to the Mac Mini. At first there were no questions about quality, but there was only enjoyment of the extended range and fidelity.
I wanted to improve the system and the sensations from it further, for which I bought an optical cable (3.5 "- Toslink), reconnected everything and started testing. Everything was successfully tested on different rips of music DVDs (Depeche Mode, Kraftwerk, A-ha, etc.). ), until it came to the Tiesto concert. The volume on the receiver was increased slightly (up to 60 conventional units, usually listened to up to 55 units.) After a while, crackles from the tweeters began to be heard on a certain track. On the downloaded rip ALAC Coldplay was also noticed
The following was a circular check:
1. Listened to music whose sound was known on this system (there was no crackling) 2.
Listened to this DVD, Coldplay rip through an analog cable (there was still crackling).
3. The sound from the iPhone was connected to check cracking tracks (there was no cod).
It's been 2 days today since the problem started. I am completely incomprehensible and with a feeling of a spoiled holiday.
What can be done to understand what the problem is? There are still 3 days left for the system with the opportunity to exchange it if you don’t like it.
My assumptions:
1. Exceeded the power, burned something (unlikely, it seems like there is a power reserve everywhere).
2. Defective receiver
3. Defective acoustics
4. Untinned wires to acoustics

Answer 1

Operate by elimination.
1) Disconnect the sub from the path
2) Leave 1 speaker in the path
3) Try to output sound to another speaker for comparison
4) If there is another amp, then temporarily connect the speakers to it
5) Switch to another DAC or similarly output sound from the Mac
6 ) Try another source (any player)

Answer 2

There was such a problem. It was in the sound system (in the drivers, probably, because it disappeared over time). A bug in the decoder is also possible. try another player (vlc for example).

Answer 3

Look for a oscillating frequency generator (there are a lot for Windows, I think there are also for macos). Walk through the entire range (especially paying attention to the frequencies you need). Various kinds of defects will immediately come out (both on the HF and on the LF), and use the music. compositions for testing can be done later (often you will not hear that something is wrong when listening to music).
Again, using the GKCH, you can easily show in the store where the defect is (hear wheezing? Voooot) and not in words that something seems to you.
ps But of course, you should not exclude the problem with the drivers either ... For the purity of the experiment, it is worth running the GKCH on another computer (with a completely different sound system)

Answer 4

1. Remove the drivers and install recommended by the manufacturer
2. Check the player settings - reset to default
3. Warm up the speakers