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Hooking up subs to mono block amp


7 replies to this topic

#1
JustinWillmon

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Hey guys i have a question regarding hooking up 2 subs to a mono block amp, ill try to explain the best i can but it confueses me. Recently i hooked up a friends amp that was a mono block with 2 inputs for speaker wires (2 + and 2-) he had 2 4 ohm DVC subs.I followed the 12 volt subwoofer wiring diagram that said to hook the 2 subs up together in parallel to get a 1 ohm load. His box was 2 seperate chambers though so i had to drill a hole to run the speaker wire through the chambers and connect the subs because i did not know how to get a 1 ohm load to each sub by running the subs to their own connections on the amp.

My question though is i know that inside the amp the speaker connections are the same and in some cases i have read that the speaker connections are ran in parallel inside. But if i was to use a box like this again where the speakers were in their own chambers, how would i wire them to achieve a 1 ohm load at the amp without connecting the subs to eachother?

#2
carshateme

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Well I do believe that's the only way to do it...that's how I do it with my boxes...if there's another way...I surely would love to know it.

To answer your question...No you cannot achieve 1 ohm load without connecting the subs to each other. Unless it's a 2 Ohm DVC sub wired as parallel. Could be wrong..so don't rely on my answer. Not a professional in speakers.
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#3
Jd1102

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im pretty sure all mono blocks are wired in parallel inside the amp so you could just hook the subs up like a 2 channel amp and inside the amp they would get connected and drop the load down :good:

#4
Sheena

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the subs eventually will be "hooked together" positive on positive, neg on neg.. refer to this..

http://www.the12volt...=2&I=42#results
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2 Runs To The Back 1 Pos 1 Neg In 1/0 Knu
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#5
JustinWillmon

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Alright so basically just hook up each sub in parallel separately and then run them to their own side of the amp since inside the amp it's ran parallel and in essence it would equal a 1 ohm load?

#6
JustinWillmon

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Sheena- thanks for the diagram that is what I used at first but I had to drill a hole in the box because each sub was in its own desperate chamber. I was just trying to figure out how to run the wires so that on every box like that i don't have to drill a hole in the box.

#7
Sheena

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well its quite simple.

two separate chambers means two wires coming from the box.

which is why there are two + and two - on mono block amps.


lets take two 4 ohm DVC subs in a separate chamber box.

sub 1: coil 1 + to coil 2 +
sub 1: coil 1 - to coil 2 -

Ohm load = 2.

sub 2: coil 1 + to coil 2 +
sub 2: coil 1 - to coil 2 -

Ohm load = 2.

now what i do is i like to keep it neat, so i go buy two terminal cups since it is a separate chamber box.

mount the terminal cups to the box. (one per chamber since it is a separate chamber box)

run two cables from each of the subs to the terminal cup.

Sub 1:
one from the positive to the red side of the terminal cup.
one from the negative to the black side of the terminal cup.

Sub 2:
one from the positive to the red side of the terminal cup.
one from the negative to the black side of the terminal cup.

each sub is now wired at 2 ohm. each sub is now in parallel.

now you will need two more cables PER SUB.

Sub 1:
positive from the terminal cup to positive on the amp.
negative from the terminal cup to negative on the amp.

your amp now sees a 2 ohm load.

Sub 2:
positive from the terminal cup to positive on the amp.
negative from the terminal cup to negative on the amp.

your amp now sees a 1 ohm load.

these subs are now wired in parallel/parallel.


this is the only way to do it besides drilling a hole in the middle of the box and running two cables over to the other sub.
09 Civic EX

KDC-X395
(2) SKAR Audio VVX-12
Skar Audio SK-1500.1
4 cu ft @32 (new box and more port soon)
Firing Forward not sealed off
Stock 80 Amp Alt
Big 3 In 1/0 Knu
2 Runs To The Back 1 Pos 1 Neg In 1/0 Knu
DD-1'd 13.8v drop

#8
JustinWillmon

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Exactly what I was thinking. Thanks for clarifying that I guess I was just over thinking it . Thanks so much for the help.



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