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Author Topic: Hissing in aftermarket unit  (Read 8933 times)
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BCoSiestaKey
First Gear
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Posts: 20


« on: September 30, 2015, 02:45:34 PM »

I saw a post about this but now I can't find it. 

After adding an aftermarket Android head unit there is a hissing.  Any suggestions on a fix? A new amp?

B. 
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Maduh
M-S.com Guinea pig.
Fifth Gear
*****
Posts: 3991


Herp Derp.


WWW
« Reply #1 on: September 30, 2015, 03:11:26 PM »

Are you using the stock amp? No amp? Is there any adjustment on the headunit? Need more info.
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RIP #361 05' Black Mica Mazdaspeed mx-5, swap in progress to 1999 Miata Base. Follow my build thread here: http://tinyurl.com/pwtx3f9
BCoSiestaKey
First Gear
*
Posts: 20


« Reply #2 on: September 30, 2015, 03:28:05 PM »

I am using the stock amp and adjustments in the Hu equalizer don't help .
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barmato
Fifth Gear
*****
Posts: 743


« Reply #3 on: September 30, 2015, 04:20:20 PM »

Assuming you're talking about an aftermarket head unit with stock speakers/amp, I think this is just a side affect of having speaker level outputs on the aftermarket HU going to another amplifier.  The noise/signal ratio is too high after being amplified twice.  Mine does it too.  The best fix is probably to bypass the stock amp and replace the speakers with "normal ohm" speakers.  Another possible fix might be to try a line level adjuster to lower the signal level but I haven't tried.  I can't really hear the hiss when music is playing.
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Chrisbee
Fourth Gear
****
Posts: 254


« Reply #4 on: October 03, 2015, 02:16:10 AM »

You'll probably need this.
It's a pre-amp line control if you're running an aftermarket head unit with the factory amp.

Scosche SLC4
Item #: 142SCOSCHE

This is from Crutchfield.
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2004 TI #3021. Purchased Oct. 2014 with 56k miles.

Engine: FM 2 kit with Hydra 2.7, 700cc injectors, and full 3" exhaust.
FM Crossflow radiator w/stage 2 airflow kit.
Suspension: Fox Racing with FM sway bars.
Wheels: 15x8 Enkei PF01s running 215/50 BFG G-force Sports.
Misc: Custom Speedhut boost gauge in place of stock oil pressure gauge. Temp gauge mod. ScanGaugeII. Blue instrument panel lights. Eclipse dash vents.

Definitely a work in progress!
BCoSiestaKey
First Gear
*
Posts: 20


« Reply #5 on: October 03, 2015, 02:21:45 AM »

I shall purchase that, Thank you. 
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TheBigChill
Fifth Gear
*****
Posts: 555


« Reply #6 on: October 03, 2015, 02:27:40 PM »

I shall purchase that, Thank you. 

Make sure you ground this guy, too.  It has a Black lead coming from.  Not doing this could result in even more interference. 
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Woody
Second Gear
**
Posts: 73


'05 MSM - Black Mica


« Reply #7 on: October 08, 2015, 04:51:25 PM »

I'm installing a new Kenwood with the Scosche this weekend.  Seems like the way to go with the BOSE amps.

http://www.scosche.com/car-stereo-output-converter

This website has PDF instructions you can download.  Much more obvious after reading them.
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'05 Mazdaspeed Miata - Mica Black - Purchased 26-Aug-05
St. Louis Area - Gateway Miata Club
No Mods Yet!  Still doing my homework!
Don't have my AARP card yet, but I'm eligible!  Still have the need for SPEED!
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