Rep Power: 346

I have not run my subs in stereo for a long time, so I have a question about it...

What are the Pros and Cons of running two subs in stereo as opposed to mono? Is there more cancellation?

 
Rep Power: 346

LOL, I couldn't run my subs in stereo anyway because they are in a single chambered box

 
Rep Power: 337

disadvantages:

potential phasing
potential loss of power due to wiring, unless you run dvc woofers.

advantages:

none, if the subwoofers are behind your face.

 
Rep Power: 0

My alpine head unit has a feature for stereo or mono for the subs does anyone know if when it is set to mono that does it sum the channels and send the summed signal to each output?

 
Rep Power: 337

thats usually how they work, I cant imagine how else it would... might be another way, Im just not aware of any other way

 
Rep Power: 0

Running subs in stereo

Advantages:
If you can see them it looks cool to have them moving at different times.
If you already had 2 amps it would be easier to hook them up in stereo than to link them together and run 2 subs mono off of 2 amps.

Disadvantages:
Bass isnt directional so it wont help the sound quality. you wont be able to tell if left or right sub is operating separately.
It will only lower your bass output by having them not working at the same time.
You would have to add a divider to a box to run them in stereo since they wouldnt be working at the same time.

I dont think there would be any advantage as far as wiring since if you have an amp that will run @4ohms x 1 it will 99% of the time run the same power @2ohms x 2

 
Rep Power: 346

I am so confused on if this amp can be run in two channel mono, or if it needs to be bridged in order to be run in mono for two subs....
JBL 1100.1

I called JBL, and he said that in 2 ch/br mode that it can run as a 2-channel mono amp...but the guy seemed to know less terminology then me...and that is pretty sad. I don't know if to bridge the amp and wire on set of wires, or to wire each amp in two channel mono mode.

...it is hard to eplain something that i am confused about

 
Rep Power: 310

First off, I'm taking the confusing instructions award away from MBQuart and awarding it to JBL, for being different.

Someone can confirm or deny my accuracy.

Basically ignore the 2 channel thing, its confusing. The amp is either used to drive a load below or above 2ohms. Below, you need to parellel the output of the amp and at or above you need to bridge it. In your case, you fit the criteria of the at or above since you are running 2 dual4s series/parellel. You've got a 4ohm load going into the amp.

The thing thats Fking you up is that the switch, Parellel - 2ch/BRG is being used to pick one of three options. One of the options shares the same switch throw, but is contingent upon the wiring Here are your options

2 subs into 2 channles
Switch = 2ch/brg
wiring = sub 1 - channel 1 and sub 2 - channel 2.

1 sub (2 parelleled subs) load is 2ohm or more.
Switch = 2ch/brg
Wiring = subs parelleled, amp bridged.

1 sub (2 parelleled subs) load is LESS THAN 2ohm
Switch = Parellel
Wiring = subs parelleled, amp bridged.

Even though the switch is on 2ch/brdg. THe amp figures out if the switch means 2 channels or bridged mono by the wiring of the subs(amp is bridged or stereoed).

 
Rep Power: 346

I have two dual 2 ohm subs, which equals 2 ohms wired in series

 
Rep Power: 310

Why the hell do I keep thinking you have 4ohm subs? Maybe I smoked too much too.

Does the rest of that answer your question though, you're still in the 2 ohm or above category.

 
Rep Power: 346

I think at some point I may have said that I have 4ohm subs to make it simpler to explain something in a previos post...I think of my subs as 4-ohm subs because they are dual 2-phm subs wired in series.

The reason I am asking all of these dumb questions is because the manuel says to try wiring the 2 ohm sub loads in both bridged and parrallel mode to see which one works better...and it will take me more then a few minutes to figure out which one I would like better...also in a review I read of the bpx500.1, it was way less efficient at 2-ohms...so I was wondering if it would be more efficient in stereo of parrallel mode. I wish the manual would just say "wire 2-ohm like this" so I don't have to experiment and rely on phsycoacoustics


...I gave you a rep point for trying

 
Rep Power: 337

no, josh is right by saying "you wont be able to tell if left or right sub is operating separately." its really impossible, psychoaccoustics or no.

he also said "It will only lower your bass output by having them not working at the same time." which is also true. what he didnt mention is that nearly 100% of the time signals from left to right are different, so in reality you can expect a nearly constant lower output.

not that any of this matters, if JBL has kept the same numbering system they always have, the .1 of the 1100.1 means its a monoblock, so you cant have stereo sound anwyays.

theres seriously no advantage whatsoever to stereophonic bass, and arguably there is no advantage to having stereo separation from any rear speaker. from a "sound quality" perspective, anyways.

 
Rep Power: 310

Personally, I think its gonna be a matter of pure volume between brdged and parellel mode. I would try bridged first since its the setting for 2ohm or above it just seems more stable and more, for lack of a better term, normal to me. Plus it sounds like it would be better for the longevity of the amp. If you aren't satisfied with the results, try it with the jumper but to me, it seems like the difference is going to be negligable.

 
Rep Power: 346

I agree