Good! I was sure you would have taken care when mounting the drivers, but wanted to eliminate that as a factor which might be causing the resonance effect.
You say that the resonance effect occurs at a very specific frequency, but don't know which one it is.
At least you must be able to tell whether the resonance occurs at a low, middle or high frequency.
Listen carefully to the low, middle and high frequency drivers to discover in which frequency band the resonance is happening.
Apart from the possibility of a faulty driver, we are back to suspecting that your inexpensive amplifier module may be to blame.
The way to eliminate that possibility would be by substituting another amp module.
You say that the resonance effect occurs at a very specific frequency, but don't know which one it is.
At least you must be able to tell whether the resonance occurs at a low, middle or high frequency.
Listen carefully to the low, middle and high frequency drivers to discover in which frequency band the resonance is happening.
Apart from the possibility of a faulty driver, we are back to suspecting that your inexpensive amplifier module may be to blame.
The way to eliminate that possibility would be by substituting another amp module.
A AB amp is really hard to find, I was searching a lot for a 50~100W amp and I only found this 80W kit one:
80 w 1.0 canal nap140 amplificateur de puissance kit classe ab amplificateur conseil pcb bord fini kit pk lm3886 dans Amplificateur de Electronique sur AliExpress.com | Alibaba Group
the probleme is that I don't want to buy a kit^^
80 w 1.0 canal nap140 amplificateur de puissance kit classe ab amplificateur conseil pcb bord fini kit pk lm3886 dans Amplificateur de Electronique sur AliExpress.com | Alibaba Group
the probleme is that I don't want to buy a kit^^
I just found it :Lusya 2 pc NAIM NAP250 MOD Stereo Audio Conseil Amplificateur Amplificador 80 w DIY Kits/fini DC15V 40V dans Amplificateur de Electronique sur AliExpress.com | Alibaba Group
but I have to keep my 24V battery (I can't have a higher voltage). Is that possible ?
but I have to keep my 24V battery (I can't have a higher voltage). Is that possible ?
It is possible to bridge the outputs of a two channel (stereo) amp.
How to Bridge an Amplifier: 7 Steps (with Pictures) - wikiHow
However, I wouldn't advise you to try this with two separate 50W modules.
Class D amps are more suited to battery operation than class AB amps because of their higher efficiency (class D wastes less energy as heat).
So I would look for a better quality class D amp module.
I do not recommend this amp for battery operation.
You would also have to buy heatsinks for the power transistors and this would cost extra money.
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Then the mid/woofer (Faital Pro 3FE22; 75mm cone; 100Hz-20,000Hz; 20W nominal) could be faulty.
Can you test it on its own from another amplifier, radio etc.?
I refer you back to post #47.
P.S. I have no idea why you would want to do this, as it will not solve your present problem, but only introduce added, unnecessary complication!
I'm only asking you to listen to it.
However, in order to test it, you would have to disconnect the Faital driver from the crossover board then connect it to an amplifier other than your class D module.
Connecting the driver to the headphone output from a radio, mp3 player or mobile phone would serve as a test.
I'm afraid I can offer no more advice - either the Faital driver or the class D module could be to blame for your problem.
Thank you.
Without actually being there to listen to your problem, it is very difficult to understand (a) what the problem is, and, (b) what the solution might be.
If you have a friend with an amplifier, use this to test your complete loudspeaker system (the subwoofer, woofer and tweeter combination).
If the speaker tests OK, then try a different Class D amp module and/or power supply.
One other possibility. Could the 'resonance' effect in the midrange be caused by your music source (MP3 player etc.)? Try another source to find out.
Or maybe you just have to accept that the effect happens, but only with certain music tracks!
Best wishes, I hope you can find a solution.
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