Wiring two dual-voice coil subs to one mono amp

venom889 · 04-14-2008, 06:11 PM

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

scott_fx · 04-14-2008, 08:45 PM

wire the voice coils in parallel (neg to neg, pos to pos) on both subs. then wire the poss. of sub one to the + on the amp and the neg of sub two to the - of the amp. then take the remaining terminals of each sub and wire them together. so it goes:
http://www.bcae1.com/srsparll.htm

ArcaneDreams · 04-14-2008, 08:49 PM

Each voice coil is 4 ohms.

If you wire those in parallel, it goes down to 2 ohms.
If you wire those in series, it goes up to 8 ohms.

Since you have 2 subs, you can wire it a couple different ways.

I think the best way to wire it would be to go for a 4 ohm load.

To get that you wire each of your subs to an 8 ohm load, then wire them in parallel together to get a 4 ohm load.

See this diagram.

You will be under powering them by a bit, but it is the best you will get with that setup.

hailrazer · 04-14-2008, 09:16 PM

When it says it is a 2ohm or 8ohm speaker what that means is each voice coil is 4 ohms.

And unlike the poster above me the correct answer is:
If you wire them in parallel 4(4)/4+4 = 2ohms
If you wire them in series 4ohms + 4 ohms = 8ohms

http://www.bcae1.com/spkrmlti.htm

ArcaneDreams · 04-14-2008, 10:10 PM

Quote: Originally Posted by hailrazer

When it says it is a 2ohm or 8ohm speaker what that means is each voice coil is 4 ohms.

And unlike the poster above me the correct answer is:
If you wire them in parallel 4(4)/4+4 = 2ohms
If you wire them in series 4ohms + 4 ohms = 8ohms

http://www.bcae1.com/spkrmlti.htm

What are you talking about?

He has 2 subs not 1.

Each sub is wired to 8 ohms.

You then wire the two subs in parallel for 4 ohms.

I am right, you are wrong.

hailrazer · 04-14-2008, 10:14 PM

Quote: Originally Posted by ArcaneDreams

What are you talking about?

He has 2 subs not 1.

Each sub is wired to 8 ohms.

You then wire the two subs in parallel for 4 ohms.

I am right, you are wrong.

I think you are missing the point I was making . You said

Quote:

If you wire those in series, it goes down to 2 ohms.
If you wire those in parallel, it goes up to 8 ohms.

That is completely backwards. Series adds ohms . Parallel lowers ohms

And I know he has 2 subs. 2 subs with 2 - 4ohm voice coils on each one.

I was just pointing out how wiring the two voice coils gives him either 2 or 8ohms on each speaker

ArcaneDreams · 04-14-2008, 10:18 PM

oops.

I transposed my words.

I got it right here though

Quote:

To get that you wire each of your subs to an 8 ohm load, then wire them in parallel together to get a 4 ohm load.

fixing.

hailrazer · 04-14-2008, 10:19 PM

Quote: Originally Posted by ArcaneDreams

oops.

I transposed my words.

I got it right here though

fixing.

I knew you knew what you were talking about I just wanted to make sure the original poster had it figured out.

ArcaneDreams · 04-14-2008, 10:43 PM

scott_fx · 04-14-2008, 11:53 PM

Quote: Originally Posted by ArcaneDreams

Each voice coil is 4 ohms.

If you wire those in parallel, it goes down to 2 ohms.
If you wire those in series, it goes up to 8 ohms.

Since you have 2 subs, you can wire it a couple different ways.

I think the best way to wire it would be to go for a 4 ohm load.

To get that you wire each of your subs to an 8 ohm load, then wire them in parallel together to get a 4 ohm load.

See this diagram.

You will be under powering them by a bit, but it is the best you will get with that setup.

that will get you the same exact impedance as what i posted... just the other way around :-)

ArcaneDreams · 04-14-2008, 11:58 PM

Yeah i was looking for that diagram while you posted. I hit reply before anyone had replied.

I always wire my subs higher impedance first, then lower it with more subs.

Its just how I always have done it.

Either way is personal preference.

venom889 · 04-15-2008, 12:19 PM

Wow, thanks for all the info guys. I just bought the monoblock amp, so I might return it for a suitable one with the correct ohm-age, but if I were to hook up it up 4ohm stable. Would it look like this? (attachment)

Because even though its a mono amp it actually has two sets of -/+ inputs.

ArcaneDreams · 04-15-2008, 12:45 PM

Yes that would be correct. The two sets of inputs were made for that.

It makes it easier than smashing two wires in one spot.

Oh, and if you get a new amp the stable Ohm load it handles wouldn't be too much of a concern.
4 Ohms is the lowest you can get your subs on a mono amp.

So if you get a new amp, simply get one that outputs 600 watts RMS or more.

It may be a bit difficult finding an amp that outputs 600 x 1 RMS at 4 ohms for cheap though.

The best I can find at the moment is an MRP-M1000. You can grab it off ebay for around $285.

Your amp you have now will work fine. In fact you may not notice too much of a difference in sending each sub 250 watts compared to 300 watts.

Just be sure that you do not crank the gain up. If you do, you will be sending a clipped signal to your subs and they can blow.

This is a common mistake. The gain is not a volume knob. It controls how much power your amp is putting out. If you turn it up all the way to get more loudness out of your subs, it strains it and the signal coming out will hurt your subs.

scott_fx · 04-15-2008, 05:13 PM

elemental designs has a relatively inexpensive mono amp that is stable down to 1 ohm. it'll power the subs just fine as long as you set your gains correctly

ronjon228 · 04-15-2008, 06:36 PM

Or check out the Cadence amps. I believe the TXA-750d does 600w x 1 @ 1ohm. Great amps for the money. They should be floating around on Ebay for around $130-150 shipped. Just make sure you buy it from the seller "Cadence Direct". There are some defective knock offs floating around from other sellers.