will this work????

[mutt_hollon 10+ year member]

ok..i have a single L7 12"..i have a Ma audio Hk 1397 (i know i know) but what i want to know is right now i have my amp running at 2 ohm (my sub is dule 4 ohm) and i only have one channel going to the sub (it's a 2 channel amp)...

what i want to know is can i run both channels to the sub and just keep the gain low or will this hurt my sub....

sorry im a newby....thanks

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[azbass 5,000+ posts]

to bridge the amp and run it correctly at 4 ohm, you would need a dual 2 ohm woofer.

 

[Prowler573 5,000+ posts]

azbass....somehow I get the feeling the OP is talking about running one VC off of one amp channel rather than bridging the amp...

 

[mutt_hollon 10+ year member]

yeah..i mean one channel to one vc and the other to the 2nd vc...sorry if this is a dumb question....i searched but did not see it anywhere.......???

 

[Prowler573 5,000+ posts]

What you're suggesting is technically possible but there's a small issue that can potentially prove more than a bit problematic using that method...

If you don't get the gains on each channel set pretty precisely matched to one another then the voice coils won't move in unison with one another.

That mismatched movement can lead to premature driver failure and nobody likes that.

I'm not good enough to trust trying it with only a DMM and not with an O-scope but that's me.

If you're willing to risk it go ahead...it's your gear....but be aware of the above described possibility.

 

[mutt_hollon 10+ year member]

i only have one gain control knob....why is it imposibal...

 

[Death By Bass 10+ year member]

look...

wire the voice coils in series...

run the sub across both channels bridged...

it will be getting pretty much the same power as off one channel, but you'll be stressing the components in both channels of the amp half as much as you were stressing them in one channel of the amp previously...

 

[mutt_hollon 10+ year member]

how do i run them in a series

 

[Prowler573 5,000+ posts]

how do i run them in a series

Like so:

 

[mutt_hollon 10+ year member]

ok...problem is i dont think my amp will run at 8 ohm...

It's a Ma audio HK 1397....that stats that MA says i has are...

4 ohm= 400 X 2 RMS stero

2 ohm= 700 x 2 RMS Stero

4 ohm bridged= 1600 x 1 RMS

What should i do???????

 

[timvanderet 10+ year member]

someone correct me if I'm wrong but I dont think the amp cares about seeing a higher resistance (8 ohms) right? It jsut wouldn't like anything lower than 4

 

[spin dB 10+ year member]

The problem with running at a higher resistance is that power output.at 8 ohms he would only be putting out 1/2 the power. If the amp is stable you can run coil to coil on the sub making it a 2ohm connection, run from one coil on the sub back to the amp's channel and you have 2ohms. if the amp is stable and can be bridged you can bridge it at the amp to give you a 1ohm load but this would generally double your power output and you must set the gains on the amp accordingly, use either a DMM or an O-scope! make sure you sub can take the power

 

[Death By Bass 10+ year member]

The problem with running at a higher resistance is that power output.at 8 ohms he would only be putting out 1/2 the power. If the amp is stable you can run coil to coil on the sub making it a 2ohm connection, run from one coil on the sub back to the amp's channel and you have 2ohms. if the amp is stable and can be bridged you can bridge it at the amp to give you a 1ohm load but this would generally double your power output and you must set the gains on the amp accordingly, use either a DMM or an O-scope! make sure you sub can take the power

its not listed as being stable at 1 ohm per channel.

it is listed as being stable at 4 ohms per channel, which is what I was suggesting he do.

he will have atleast as much, if not more power from the two channels bridged at 8 ohms total, than running the sub in parallel off a single channel at 2 ohms.

 

[mutt_hollon 10+ year member]

ok guys...thanks for the help so far... i tryed to run one channel of the amp to each vc...so one channel to the right and one channel to the left...using both sides of the amp and the sub was getting hot.....so then i bridged it and ran it bridged to one vc and i ran it in a series...i guss...it looked like this....from amp (Bridged) to one + and -.....the other + and - on the sub were conected by a spair wire, but this side did not thouch the vc going to the amp....it also got hot and had a smell..

what do i do now....i put it back the way i had it....with is only using one side of the amp and running at a 2 ohm load....but i think that only using one side of the amp is hurting it.....