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Old 04-14-2008, 06:03 PM   #1
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Default Wiring two dual-voice coil subs to one amp

I've got two dual voice coil subs I'm trying to hook into a mono sub with two sets of speaker outputs.

Infinity 1252W (300W RMS) Link
# 2 or 8 ohm impedance

Infinity 1600A Link
# 894W peak output @ 2 ohms
# 400W RMS output @ 4 ohms
# 600W RMS output @ 2 ohms

I'm rather confused on how to hook these up. It's been a while since I've taken physics

My subs are 2 or 8 ohm, but dual-voice coil. Does this mean each hookup (each voice coil) is 1 ohm or 4 ohms? Will I have to hook these subs up in parallel?

Help please!
EDIT: Manual Link Scroll to 1600a
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Old 04-14-2008, 06:49 PM   #2
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Your subs have dual 4ohm VC. If you wire them parallel you basicly have a 2ohm sub. Wire them in series and you have a 8ohm sub. Either way you go, the amp is only going to see a 4ohm load and not put out full power. My advice is to get either 2 4ohm subs and wire them in parallel for a 2ohm load at the amp, or get 2 DVC subs with 2ohm VC and series the sub voice coils and parallel the subs, for a 2 ohm load at the amp. Let me know if you need more help.
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Old 04-14-2008, 07:41 PM   #3
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I agree on that one, you could wire the subs up for a 1 ohm load in parallel, but your amp can't handle it. So, unfortunately, you have a bad combo. Either get new subs, a new amp, or run them at 4 ohms and not use the potential of either subs or amp.

They might still sound ok if you run them at 4 ohms, since, technically, they'll be getting 200rms each still. Give it a shot and see if you're satisfied. To do that, you'll have to wire the subs parallel to each other, but the voice coils of each sub in series.
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Old 04-14-2008, 08:07 PM   #4
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fyi the older infinitys like 611 and 1211a were one ohm stable but it wasnt published. no increase in power but stable, came straight from the infinity rep we had at the time. And did a number of setups like that, my buddy has been runnin a 1211a at 1 ohm for over 2 yrs now no problems
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Old 04-14-2008, 10:32 PM   #5
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Quote:
Originally Posted by pentavolvo View Post
fyi the older infinitys like 611 and 1211a were one ohm stable but it wasnt published. no increase in power but stable, came straight from the infinity rep we had at the time. And did a number of setups like that, my buddy has been runnin a 1211a at 1 ohm for over 2 yrs now no problems
Good to know. Thanks for the info.

In that case, you should be able to hook them up at 1 ohm and run no problems!
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Old 04-14-2008, 10:54 PM   #6
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It does not sound like he is running an older amp. This amp my be stable to 1 ohm though. Try and see, just beware and keep a very close eye on the amps temp and make damn sure it can gets LOTS of cool air.
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Old 04-15-2008, 12:01 AM   #7
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Thanks for the info guys. I work at Best Buy, so I get a pretty steep discount on most this stuff (also hence the retail brands- alpine, infinity, etc). My full setup is actually somewhat like this:

Front Door Panels: Type R Speakers (110w RMS)
Rear Seat Panels: Type S Speakers (85w RMS?)
Hatch Panels: Nothing
Powering these is an Infinity 4-Channel Amp. 4x111RMS((7541a Link)

Hatch: Two Infinity 12" References (300w RMSx2)
Powered by the Infinity 600w Mono-block as stated before.

Good: I just bought the mono amp, so there shouldn't be a problem returning it if need be.
Bad: I've been building the setup piece by piece, so everything else is out of date to return. Before buying this second amp, I was just powering the two type r's and bridging the 3rd/4th channel on the 4channel amp to power one sub.

I spose it wouldn't be a big deal to return the mono amp and find a suitable one. That's really my only choice besides under-powering them I guess. The infinity is the newer model, would running it at 1 ohm be a risk? Wouldn't it auto turn-off before damage? With a combination of me working at BB, and having the 4 year service plan on it, I'm sure I could return it blown and send it to devo.
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Old 04-15-2008, 07:57 AM   #8
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There should be some thermal protection that cuts the amp out/off before damage occurs in those amplifiers, so you are correct there. Even some of the cheaper amps have this protection circuitry in them that would send it into protect mode.
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Old 04-15-2008, 08:40 AM   #9
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Yes, infinitys definitely have thermal protection.

IMO, since you work at best buy and probably paid 20-30 bucks for those subs, forget 'em and buy a set of type-r subs, also at a ridiculously low price. They'll hit wayyyyyyy harder than those ref's. They'd probably be a special order item, but Alpine makes a DVC 2 ohm type-r, SWR-1222D.
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Old 04-15-2008, 12:26 PM   #10
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Yeah I thought they did (as well as most amps). Well, I've got 30 days to mess around with this amp at least.

I'm gonna try to hook them up 4ohm stable, but the only thing that keeps confusing me, is even though this is a mono amp, it has two sets of -/+ terminals. So would I hook it up like this? (attachment)
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Old 04-15-2008, 12:59 PM   #11
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I think they only put those two sets of terminals on a mono amp to make wiring easier. Just put one sub on each terminal and it should work the same as if you only had one set.
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Old 04-18-2008, 01:24 PM   #12
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Hey thanks for all the help guys, sounds pretty flippin badass at 4ohms, so I plan on leaving it there, I might try and push the amp one of these days, but until then, thanks again ls1tech!
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Old 04-18-2008, 02:26 PM   #13
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SWEEEEEEET!
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Old 04-18-2008, 02:26 PM
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