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sub/amp cable question

post #1 of 9
Thread Starter 
I couldnt find the car audio section so my bad. Ok my buddy has a planet audio 1600.4 with 2 power bass m-124d. As you can see the audio shop bridged channel 3 and 4..... then went on and split the cable again to hook them up into each subs port. Dont the subs lose power doing that? splitting the connection twice for 2 subs? I thought it was suppose to be channel 3 goes to one sub and channel 4 goes to the other.





My theoretical correct format

700




My theoretical incorrect format

700
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post #2 of 9
Thread Starter 
no one?
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post #3 of 9
When you bridge a 4 ohm amp it will drop down to 2 ohms, single channel. Two 4 ohm subs running parallel would drop that load to 1 ohm.
    
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post #4 of 9
They're bridging channels 3 and 4 together. Perfectly normal. The subs are probably a 4ohm load together, and bridged at 4ohm will give you the most power output from that type of an amplifier.

Your friend honestly shouldn't be using a 4 channel amp to power subs though, they're typically not enough power.
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post #5 of 9
Thread Starter 
It looks like the split the power too much no? Idk haha... instead of channel 3 to one sub and channel 4 to the other.


That was the best possible way to do it at the time...instead of picking up a 2 or 1 channel amp on top of another amp for the speakers. Also he probably would have needed another battery and to upgrade the alternator. Plus the subs BUMP. It's ridiculous even the Bass Junkie at the audio shop came out and was like Woh..... lol
Edited by Quesoblanco - 2/23/12 at 12:39am
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post #6 of 9
Quote:
Originally Posted by quesoblanco View Post

It looks like the split the power too much tho... instead of channel 3 to one sub and channel 4 to the other.


That was the best possible way to do it at the time...instead of picking up a 2 or 1 channel amp on top of another amp for the speakers. Also he probably would have needed another battery and to upgrade the alternator. Plus the subs BUMP. It's ridiculous even the Bass Junkie at the audio shop came out and was like Woh..... lol

This is just an example.... But this is what you're see off a TYPICAL 2 channel amp (pretend its a 2 channel, same thing applies to 4 channels).

2x 50w RMS @ 4ohm
2x 75w RMS @ 2ohm
1x 150w RMS @ 4ohm bridged

So say your friend has two dual voice coil subwoofers (4ohm coils). That gives him a 2ohm (or 8ohm, but 2 is more common in cars) load per subwoofer. Wired together correctly at the amplifier, that would give him 4ohms at the amp. So it'll be the same exact amount of power running bridged at 4ohm (150w RMS x1, split into 2 speakers, that's 75w per speaker), as it would be by running them in 2ch stereo mode (75w per speaker).

Either way, if I'm understanding it correctly will give the same EXACT amount of power out to each speaker (sub).

A lot of people will use one monoblock amplifier (only one output) for multiple subs. It's actually quite common to do. I've seen a 3000w RMS monoblock amplfier power 16 subs off its one output before. There's nothing at ALL wrong with it, so long as its done correctly. And it sounds like the shop your friend took it to did an okay job.
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post #7 of 9
Thread Starter 
Quote:
Originally Posted by pioneerisloud View Post

This is just an example.... But this is what you're see off a TYPICAL 2 channel amp (pretend its a 2 channel, same thing applies to 4 channels).
2x 50w RMS @ 4ohm
2x 75w RMS @ 2ohm
1x 150w RMS @ 4ohm bridged
So say your friend has two dual voice coil subwoofers (4ohm coils). That gives him a 2ohm (or 8ohm, but 2 is more common in cars) load per subwoofer. Wired together correctly at the amplifier, that would give him 4ohms at the amp. So it'll be the same exact amount of power running bridged at 4ohm (150w RMS x1, split into 2 speakers, that's 75w per speaker), as it would be by running them in 2ch stereo mode (75w per speaker).
Either way, if I'm understanding it correctly will give the same EXACT amount of power out to each speaker (sub).
A lot of people will use one monoblock amplifier (only one output) for multiple subs. It's actually quite common to do. I've seen a 3000w RMS monoblock amplfier power 16 subs off its one output before. There's nothing at ALL wrong with it, so long as its done correctly. And it sounds like the shop your friend took it to did an okay job.

Ah ok i get it thank you. Its weird that they combined the channel 3 and 4 into 1 cable..... then split it again into 2 cables for each sub Pos/Neg port on the box. I thought it would be more efficient and what not to just take a cable from channel 3 and a cable from channel 4 and just put one in each Pos/NEg Port. But if the outcome is the same then its all good. I just found it odd that 2 different ways would give the same results because one has less splitting of the cables than the other. I thought when u bridge with dual voice coils.. its either 8 or 2?
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post #8 of 9
Quote:
Originally Posted by quesoblanco View Post

Quote:
Originally Posted by pioneerisloud View Post

This is just an example.... But this is what you're see off a TYPICAL 2 channel amp (pretend its a 2 channel, same thing applies to 4 channels).
2x 50w RMS @ 4ohm
2x 75w RMS @ 2ohm
1x 150w RMS @ 4ohm bridged
So say your friend has two dual voice coil subwoofers (4ohm coils). That gives him a 2ohm (or 8ohm, but 2 is more common in cars) load per subwoofer. Wired together correctly at the amplifier, that would give him 4ohms at the amp. So it'll be the same exact amount of power running bridged at 4ohm (150w RMS x1, split into 2 speakers, that's 75w per speaker), as it would be by running them in 2ch stereo mode (75w per speaker).
Either way, if I'm understanding it correctly will give the same EXACT amount of power out to each speaker (sub).
A lot of people will use one monoblock amplifier (only one output) for multiple subs. It's actually quite common to do. I've seen a 3000w RMS monoblock amplfier power 16 subs off its one output before. There's nothing at ALL wrong with it, so long as its done correctly. And it sounds like the shop your friend took it to did an okay job.

Ah ok i get it thank you. Its weird that they combined the channel 3 and 4 into 1 cable..... then split it again into 2 cables for each sub Pos/Neg port on the box. I thought it would be more efficient and what not to just take a cable from channel 3 and a cable from channel 4 and just put one in each Pos/NEg Port. But if the outcome is the same then its all good. I just found it odd that 2 different ways would give the same results because one has less splitting of the cables than the other. I thought when u bridge with dual voice coils.. its either 8 or 2?

That's correct. They could also have the subs wired as 8ohm each as well, which they could still get 4ohms at the amp that way too. I was only using 2ohm as an example. If they're DVC subwoofers, then bridged will be the correct way to run them, because that will give him 4ohm at the amp bridged, which will give him the most amount of power possible, other than running 2ohm stereo...which will be the same.

2x4ohm coils, you can have 2ohm or 8ohm per sub. Then that same rule applies to wiring the subs to the amp. 2x2ohm subs can be 1ohm or 4ohm. 2x8ohm subs can be 4ohm or 16ohm.
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post #9 of 9
Thread Starter 
Ah ok I appreciate your time. Thanks!
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