Relays for speaker impendance

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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=71959
Printed Date: May 14, 2025 at 4:49 AM

Topic: Relays for speaker impendance

Posted By: david n germany
Subject: Relays for speaker impendance
Date Posted: February 01, 2006 at 4:18 AM

Ok I have 4 dual 2 ohm vc subs and would like to set up a relay array to switch between 1ohm and 4 ohm loads for the amp. (yes the amp will take the 1 ohm mono load)

I have a friend that set a record for 0-100 watts in USAC that did this with a US Amps/ Kove install (4 vlx 25's and I think it was 8 or 12 Kove 12's) but have lost contact with him. If I remember correctly it was 12 relays to switch the loads from .25 ohm to 8 ohm but I can't remember exactly.

Can anyone help?

Thanks!

David

Replies:

Posted By: hotwaterwizard
Date Posted: February 02, 2006 at 1:57 AM

This is how I read you.

We have 8 voice coils at 2 ohms each and you want them configured in MONO to one amp. You also want to flip a switch and change it from a 4 ohm load to 1 ohm using all available voice coils.

-------------
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: david n germany
Date Posted: February 02, 2006 at 3:15 AM

Correct. 8 2ohm voice coils

if I go each speaker in a series would give me 4 4ohm loads then I could parallel each for 1 ohm or series and parallel for 4 ohm.

I am thinking another option would be to switch it to 16 ohm for easy listening and switch to 4 ohm or 1 ohm (probably 4 ohm as the best option)

So I am thinking switchable from 16 to 4 could be my best option.

Thanks for the reply by the way!

David

Posted By: david n germany
Date Posted: February 02, 2006 at 4:43 AM

[IMG]https://www.the12volt.com/images/changewoofohm.gif[/IMG]
Here is how to switch between Series and parallel, I think I would need 2 of these (each pair of speakers wired with one array and each speaker paralled ) wired in a series. When they are energised then they would be 2 2ohm loads in a series making a 4 ohm mono load.
Woot! I think I got this! and only need 4 relays!

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