2007 Saab 93 2.0T with 150 Watt 7 Speaker Audio System.
Hello all and as the name may suggest, I am finally reunited with my beloved 93 after being on a work assignment overseas for two years!
In any event my younger brother has been driving and taking care of my car since I've been away and told me last month about an issue with the sound system. Having gotten back two weeks ago, I've been messing with this issue in the little spare time I have to no avail.
Here is the issue. All seven (or at least four) speakers have lost all bass and much of mids. Two doors and the rear speakers do not produce any bass at normal listening level. Maxing out the bass via tuner and listening at low/normal level does produce a sort or "blown speaker sound" when the bass hits but the treble (while weaker than normal) sounds fine and does not crackle or anything of the sort. Odd part is (as noted in troubleshooting section of this , if I turn my volume around 50+%, the bass returns to the rear speakers and drivers side door, but not passenger side door speaker. It does still crackle from drivers side though although less audible.
Thinking it was assuredly the amplifier, I replaced it with another used stock Saab one today and still nothing. Before taking apart the entire dash and looking for something I'm not even sure of, I was really hoping someone here could lend some insight as I am no electrical guy and these things often see me just paying someone to fix it but monies a bit tight right now. Any help would be greatly appreciated and I'd be more than happy to Venmo some coffee money to anyone that leads me to a solution for their time as I feel bad dropping into this Forum a new member and immediately asking for help.
What I've done to troubleshoot so far (and the odd things):
-Tested all speakers (except dash mounted ones as these work) with multimeter and seem to be functioning at the correct ohms.
-Played with faders and the front drivers side door speaker is the only one that has a crackle sound when bass comes on.
-When volume is turned up high, the front drivers side door speaker regains most of its bass but has that same crackle sound. When I do this and then fade all the sound to the back rear speakers, there is no bass, but as soon as I fade it towards the front, the rear speakers regain their normal bass response.
-Fading the sound (left to right) to the the front passenger side one does not produce any bass at all. Putting my ear near it, I do here very faint vocals though and seems to remain static no matter how loud I place the volume.
-All 3 dash speakers are functioning as I originally mentioned.
additional clues: my brother said that during his normal, albeit obsessed, podcast listening he encountered a repetitive noise that sounded like someone was tapping the end of a microphone and some static from the front top shelf left speaker a couple of times back in December and January and he proceeded those occasions to turn off the stereo until he got where he was going as turning it off an on did nothing when it happened. He said after letting the car sit for a little, it was fine again. I was able to encounter this recently as well.Sound Sample of Static