switching ohm load with relays?

[k_schutte 10+ year member]

OK... i was glancing through a post and seen something about using relays to control what ohm load the your amp runs at..?!!?!.!? i think so anyways...?

Curious as to how that works? i have the 1.5ohm QVC APX18 i want to run it at 1.5ohm daily of course but it would be cool if i could "flip a switch" when i get metered and run it at .35 ohm (i think that is right)... possible?

i am not going to be running this amp/sub combo until i switch to my 16v setup... right now i am just using the XXX-6500D on an Elevation Audio Execution 15" running at 4ohms... I am going to be getting the H.O. alt with an external reg shortly, then all else i need a couple 2/3 PowerMaster D1000's and a step down and i should be good to go for th e1.5ohm/.35ohm....

Click to read more...

 

[Fusion_FREAK 10+ year member]

You do know you need basically a whole different electronics system to run 16v right? Like, using more than one alternator. You car's electrical can't take 16v.

Are you talking about resistors? A relay is nothing but a switch that engauges manually or automated.

And half of 1.5 ohms is .75 ohms, I don't know how you got .35 ohms. //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

 

[smd4life 5,000+ posts]

don't do that

 

[Ed Lester 10+ year member]

He said quad 1.5 ohm coils.

So you can have it setup in parallel/ series to be 1.5 ohm and the flip your relays to switch it to all parallel at .375 ohms.

You can certainly do this. I have done it before to turn on/off 2 subs to 4.

Also, you wrote what you are doing for a 16v setup and that will be good as long as you use that stepdown for the car's electronics.

 

[Ed Lester 10+ year member]

One issue is signal quality through relay contacts and using relays that can handle the current/voltage.

Make sure you choose the proper, high quality relays.

 

[Louisiana_CRX 5,000+ posts]

I think your resistance would be screwed up using rrelays to switch the ohm load...I researched it years ago...I use a heavy duty barrier strip with colored wire jumpers and manually change mine....takes only a minute or so....

 

[fwb_1234 10+ year member]

One issue is signal quality through relay contacts and using relays that can handle the current/voltage.
Make sure you choose the proper, high quality relays.

For serious. You might end up with a nice little ball of copper and plastic.

Also, you are looking for a switch, not a relay. A relay has a signal wire that flips an electronic switch internally.

 

[audioarsonal 10+ year member]

^^^^It only takes a miniute to change mine around.

 

[Louisiana_CRX 5,000+ posts]

One issue is signal quality through relay contacts and using relays that can handle the current/voltage.
Make sure you choose the proper, high quality relays.

I'm sure your right on maybe higher end relays...I had checked with standard 40 amps like used on alarms or remote starts...and found by research not to use those...I never really checked on higher end relays...I figured they would still cause problems as well...but maybe not....

 

[Ed Lester 10+ year member]

For serious. You might end up with a nice little ball of copper and plastic.
Also, you are looking for a switch, not a relay. A relay has a signal wire that flips an electronic switch internally.

As long as your connections are made on ples 30, 87, and 87a, then it is exactly like using a switch.

The difference is that you are switching it remotely rather then manually.

Also, relays commonly handle more current than switches.

 

[Haunz 10+ year member]

I did an install once where three DVC subs each had one coil wired through relays.. during normal operation each sub had 1 coil connected to a pot so QES could be adjusted.. hit the switch and all 6 coils were paralled to the amp for 'spl mode'

I used three $5 30A bosch relays in parrallel for each sub

 

[audioarsonal 10+ year member]

Here's a diagram

http://www.the12volt.com/relays/page5.asp#spvr

 

[Ed Lester 10+ year member]

I did an install once where three DVC subs each had one coil wired through relays.. during normal operation each sub had 1 coil connected to a pot so QES could be adjusted.. hit the switch and all 6 coils were paralled to the amp for 'spl mode'

I used three $5 30A bosch relays in parrallel for each sub

Sweet, Bosch relays are good.

You can even get 200A/400v relays if you want overkill, they are $251 ea.

 

[k_schutte 10+ year member]

You do know you need basically a whole different electronics system to run 16v right? Like, using more than one alternator. You car's electrical can't take 16v.
Are you talking about resistors? A relay is nothing but a switch that engauges manually or automated.

And half of 1.5 ohms is .75 ohms, I don't know how you got .35 ohms. //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

no... you basicaly just need a step-down such as the PowerMaster 993...

no... not resistors, RELAYS to SWITCH from 1.5 to .375 ohms...

yes, half of 1.5 is .75 but 1/4 of 1.5 is .375 since it is a Quad Voice Coil....

 

[k_schutte 10+ year member]

Here's a diagramhttp://www.the12volt.com/relays/page5.asp#spvr

I know is shouldn't be confusing but this is the first QVC sub i have ever had... Basicaly i would just wire it like a pair of DVC subs correct?

i am lost... frikkin mutliple coils, i miss the 90's

Anyone feel like drawing me something up in paint or something?