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How to set up relays for speakers

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=25326
Printed Date: May 15, 2024 at 12:34 PM


Topic: How to set up relays for speakers

Posted By: f1monkey
Subject: How to set up relays for speakers
Date Posted: January 26, 2004 at 8:39 PM

I'm looking for a diagram or description of how to properly hook up my speaker leads to a relay. I'm planning on hooking up my fronts and and rears to this on off relay setup. The reason for this is because I get a slight pop from the amp on turn off sometimes and this is the only way to work around it. My amps put out 150 each in the front and 75 each in the back RMS max.

Right now I've got one relay hooked up to power a fan and 2 amps. There is also a variable turn on delay that I built in the path to turn on the relay.

Can I just daisy chain the output of the relay I have now to the speaker relays? Do I realkly need 8 30 amp relays to do this? Will there be any degradation of signal running audio through a relay?

I'm familiar with hooking up a relay but just to make sure for the speaker:

86 - turn on signal or out put from other relay
85 - ground
87 - speaker output from amp
30 - to my speakers

- Kyle



Replies:

Posted By: geepherder
Date Posted: January 27, 2004 at 10:28 AM
Adjust your delay and install a diode across the coil of the relay.  See what that does.

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My ex once told me I have a perfect face for radio.




Posted By: f1monkey
Date Posted: January 27, 2004 at 1:38 PM
and that would do what for hooking up my speakers?

I've already got a 1N4001 on the relay for the amps and fans. All that does is keep the spike from hitting the HU when I turn it off.

- Kyle




Posted By: geepherder
Date Posted: January 27, 2004 at 4:03 PM
If you install a diode across the coil of the relay for your remote tun on, it'll keep your amp from taking a hit.  Most new amps have turn on delays built in, so you may not need this on your remote lead.  Connect your remote lead to the switched accessory lead on the radio.  After this connection, put a diode in series with the radio, and install a 440 or 1000 uf capacitor in parallel.  This way your amp will power down before the deck, ridding you of the annoying turn-off pop.  Now you shouldn't need four relays.

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My ex once told me I have a perfect face for radio.




Posted By: f1monkey
Date Posted: January 27, 2004 at 7:40 PM
and if my amp itself pops on turn off then?




Posted By: geepherder
Date Posted: January 29, 2004 at 12:56 AM
The turn off pop is usually caused by not having a suppression diode across the coils of a relay, or the deck powering down before the amp.  In the case this doesn't clear up your problem, you could try a higher value cap (more delay time), or replace the amp.

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My ex once told me I have a perfect face for radio.




Posted By: terryr
Date Posted: January 30, 2004 at 7:41 PM

This site has stuff on car audio circuits.

https://www.bcae1.com/





Posted By: danw2002
Date Posted: February 02, 2004 at 6:11 PM
i have a 4 channel delayed speaker relay set up for a big Carver amp that i could sell you cheep, i have them for building custom amps for Hot Rods and such,and have  few extra.....might be easyer then makeing them, this is a full delayed curcuit with all the componits on a single board/

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Danw2002, 20+ years doing custom nut ball things...in Seattle..




Posted By: sroth140
Date Posted: February 04, 2004 at 12:14 PM
try putting a 1k ohm resistor on the remote wire.  that fixes the turn on pop on factory ford amps with after market decks.  not too many people use that combination but hey, the owners who drive the car sure know more than the people who work on this stuff every day of their lifes... :rolleyes:




Posted By: mikeshonda750
Date Posted: February 07, 2004 at 9:25 PM
hahahahahahhahahah

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