North American Turbocoupe Organization



speaker distortion
Nsw Offline
Senior Member
#1
ive had a big sterio in my old tc and new one and never had a problem. i wired up a new deck the exact same way and now there is alot of distortion from the incar speakers especialy when the bass hits. the strange thing is its only when the car is running, when its not it sounds great. anyone else have a similar problem or have anyideas what it might be?
1988 5speed black every option. 3inch single turbo to tail(stinger), manual boost control. k&n cone walbro fuel pump

1986 xr4ti project car..... way to many mods to list.
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Ryan H Offline
Posting Freak
#2
Sounds like it isn't being regulated properly or something when there's more juice being pushed through it. But don't quote me on that, I don't know what I'm talking about. Just a quick thought. lol

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Ryan Harris

1988 TC, 5 speed, all options including sunroof Smile

1987 3.8L V6, C4, 160K miles, no options (winter car, when it works)

RIP 1987 TC, "Built" A4LD, 119K miles, all options except sunroof Sad

My Audio Mixes
'88 TC Smile Walbro 255HP, Stinger FMIC, PIT BOV, Pro 5.0, Kirban, RR cam, FRPP strut tower brace, T3
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Nsw Offline
Senior Member
#3
i forgot to mention that i have the stock eq and amps still hooked up and in use. i did that by splicing one of the 12volt power wires and hooking it up to one of the wires onthe stock harness.....dont rember which one. but i had this setup for 2 years in my old car with no problems. it worked fine in this car untill i installed a new deck. i doubt its the deck ethier beacuse the voulume knob broke and i got a new unit while it was under warrenty
1988 5speed black every option. 3inch single turbo to tail(stinger), manual boost control. k&n cone walbro fuel pump

1986 xr4ti project car..... way to many mods to list.
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Ryan H Offline
Posting Freak
#4
Try disconnecting the amp [Image: smile.gif]

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Ryan Harris

1988 TC, 5 speed, all options including sunroof Smile

1987 3.8L V6, C4, 160K miles, no options (winter car, when it works)

RIP 1987 TC, "Built" A4LD, 119K miles, all options except sunroof Sad

My Audio Mixes
'88 TC Smile Walbro 255HP, Stinger FMIC, PIT BOV, Pro 5.0, Kirban, RR cam, FRPP strut tower brace, T3
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GaryS#2 Offline
Posting Freak
#5
I don't know how you have the amp connected, is it RCA plugs, or speaker wires feeding the amp?
Usually distortion is a lack of power, hence the crapping out when the bass or heavy current draw kicks in.
I always overpower(exaguration of the word) my speakers. In other words feed 50watt speakers with at least a 100 watt amp, rather than vice/versa.
As Ryan suggested try running just from the deck.
It could be the signal from the deck is too high for the stock amps, if you are using speaker wire for feeds?
Grocery Getter/Rice Cooker.
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Joe F Offline
Posting Freak
#6
Quote:Originally posted by GaryS#2:
...It could be the signal from the deck is too high for the stock amps, if you are using speaker wire for feeds?

Most likely the problem. Everything I've read leads me to the belief that the stock amp doesn't play well with aftermarket heads.

HTH



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Be Cool,

Joe

JR's Place - My 87 TC
JR's Place - My '87 Turbocoupe
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Jeff K Offline
Administrator
#7
The stock amp is a POS..... puts out something like a whole 4W peak per channel....a whopping 16W peak total. I dont even think you can buy a bargin basement head unit that puts out LESS than 16W peak these days.

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Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 21 psi, forced air intercooler, water injection, bypass valve, Ranger roller cam, subframes, etc., etc.. // 86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP nitrous, ignition, gears, suspension, etc., etc.... // 91 Escort: Bone stock winter car // 04 Taurus Duratec (wifes car)
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Mr. Vanos Offline
Member
#8
Ditch the stock amp...and the EQ. You're probably putting in too hot a signal (i.e. speaker level signals) and the amp is clipping. Like Jeff K sez, it's a POS anyway, lots of distortion and not a lot of power....would make a better guitar foot pedal or something. [Image: smile.gif]
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Nsw Offline
Senior Member
#9
is there a way i can discopnnect the factory amp and keep the Eq? if so how. and if i disconnect the stock amp will the speakers work?
thjanks alot
joe
1988 5speed black every option. 3inch single turbo to tail(stinger), manual boost control. k&n cone walbro fuel pump

1986 xr4ti project car..... way to many mods to list.
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Mr. Vanos Offline
Member
#10
Haven't pitched the factory stereo on this car yet, but on my '85, I just hacked the ends off of the factory amp (two pigtails, one input + power, one output) and then wired up each speaker output to the corresponding head unit input...then you can plug that straight back into the factory wiring harness without hacking that up. Probably the cleanest solution...and if you aren't planning on putting a competition system in the car, it's plenty good. The factory amp only drives the rear speakers, there is no external amp for the front speakers. You may be able to keep the EQ, but I'm planning on ditching that as well, as I'm sure it'll make the system sound worse.

[This message has been edited by Mr. Vanos (edited 12-17-2004).]
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