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» Termpro Audio Forum » Installer's Corner » Advanced Topics » Switching Impedance

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Author Topic: Switching Impedance
FuriousG
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What, if any, would be the cons of switching impedances with relays....I have the two DVC subs and want to run them at 2 ohms daily..but also want to try running them at .5 by engaging a remote switch

If i were to do this with relays would I be looking at signal corruption?

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Pioneer 8500MP
Phoenix Gold 5.0:4
Focal Poly 165V2 comps
Orion 2500D
Adire B15 Brahma in 4^ @ 25Hz


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Posts: 225 | From: Kenora,Ontario,Canada | Registered: May 2003  |  IP: Logged | Report this post to a Moderator
emu
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Sounds like a great idea [Eek!] . Go for it. [Roll Eyes]
Posts: 768 | From: Ottawa, On, Canada | Registered: May 2000  |  IP: Logged | Report this post to a Moderator
FuriousG
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ok then....I was just curious if anyone had done it..and had any ideas if it would introduce noise into the ckt

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Pioneer 8500MP
Phoenix Gold 5.0:4
Focal Poly 165V2 comps
Orion 2500D
Adire B15 Brahma in 4^ @ 25Hz


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Posts: 225 | From: Kenora,Ontario,Canada | Registered: May 2003  |  IP: Logged | Report this post to a Moderator
ddstang
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It will most likely not add any noise to the system. When you go to an audio store, their displays use relays to change between speakers, amps, and source units.
Posts: 327 | From: Pleasanton & Sacramento Ca | Registered: Dec 2001  |  IP: Logged | Report this post to a Moderator
trafficjamz
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quote:
Originally posted by FuriousG:
What, if any, would be the cons of switching impedances with relays....I have the two DVC subs and want to run them at 2 ohms daily..but also want to try running them at .5 by engaging a remote switch

If i were to do this with relays would I be looking at signal corruption?
You shouldnt have any problem with doing the relays. If you ever suspect anything, change out the relays or pop them open and inspect for any type of corrosion or oxididation.
Just to see how good your connections are, I would take an spl measurement before and after the installation of the relays to see just how much loss you have. Make sure all the settings are the same for the test. I would also make the switch of impedances with the amps off......Just in case the amp freaks out.

I build a sound room for a shop here in Cookeville and build the switching system out of Bosch style relays and had way more problems than I though I would have.

Dom

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Posts: 1194 | From: LaVergne TN. | Registered: Sep 2001  |  IP: Logged | Report this post to a Moderator
jc2
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I did the same thing with 3 JL 12W6s to swtich between 1 and 4 ohms. Was actually a huge PITA to wire them all but had no problems with them. Make sure you get realys that can cary enough current. I also had a circuit to temporarily turn on the amp when it was switching so you didn't have to have the system off when you switched.
Posts: 2575 | From: GA | Registered: May 1999  |  IP: Logged | Report this post to a Moderator
FuriousG
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I'll likely use Bosch relays...30A ratings...that'll be enough handling I figure.

Thx for the responses guys!!

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Pioneer 8500MP
Phoenix Gold 5.0:4
Focal Poly 165V2 comps
Orion 2500D
Adire B15 Brahma in 4^ @ 25Hz


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Posts: 225 | From: Kenora,Ontario,Canada | Registered: May 2003  |  IP: Logged | Report this post to a Moderator
deezay
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not to thread jack.... but how would you do this? can someone shwo me how i would do this will my two quad 2ohm subs.. i'd like to be able to run at 1ohm or 4 ohm. thanks!
-andy

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TEAM ShOcKeR
12" ShOcKeR SIG
PA A3000DB @ .7ohm
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Posts: 191 | From: Stryker, OH | Registered: Aug 2003  |  IP: Logged | Report this post to a Moderator
FuriousG
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Same as how I would do mine...Wire 2 coils on each sub in series...then parallel each pair with a relay...so you would have two 4 ohm loads in parallel=2 ohms...plus the second sub= 1 ohm

I'll post a diagram when I get home [Smile]

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Pioneer 8500MP
Phoenix Gold 5.0:4
Focal Poly 165V2 comps
Orion 2500D
Adire B15 Brahma in 4^ @ 25Hz


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Posts: 225 | From: Kenora,Ontario,Canada | Registered: May 2003  |  IP: Logged | Report this post to a Moderator
deezay
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if you could, or if someone could show me how to wire this.. i'd be much obliged... i'm going to try it tomorrow. thanks!
-andy

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TEAM ShOcKeR
12" ShOcKeR SIG
PA A3000DB @ .7ohm
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Posts: 191 | From: Stryker, OH | Registered: Aug 2003  |  IP: Logged | Report this post to a Moderator
Team BIO-Rick
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Rick Logan

TEAM DB DRIVEN.

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160+db and gaining.....

I think that I have said too much....................I must go now................the SPL Ninja's are upon me -
Need more power? UP YOURS!! with Excessive Amperage!
Posts: 6070 | From: Northern California | Registered: Nov 1999  |  IP: Logged | Report this post to a Moderator
thylantyr
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If your amplifier can handle 1/2 ohm then
why would you want to switch it ?

For daily driving ? But isn't the woofer
output a function of volume knob [Smile]
Posts: 47 | From: California | Registered: Feb 2003  |  IP: Logged | Report this post to a Moderator
   

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