What does reverse sub do on Pioneer 8400MP?

[Devedander]

I read the manual and I Can't figure out what the revers option does on the subs. It shows the sub pointing down instead of up when I choose it but it sounds pretty much the same, different but I can't quite call what it is.

Also anyone konw how ASL works on these puppies? I turned it on and it does adjust my volume for me as the car gets noisier but I don't get how it can tell how noisey my car is.

Thanks.

[xivera]

I think the "reverse sub" option changes the phase [angle] of the sub. It's basically like manually changing the polarity of the wires (+'ve/-'ve). Sometimes, some subs may sound better by using this.

Recently, I have played with my phase. It sounds better now...

ASL: The idea is to set it so that when changing between sources there is no shockingly amount change in volume. (Mine is adjustable.)

[Devedander]

Is it bad for subs to be played in reverse? Wouldn't it be bad to hook up pos to neg and vice versa?

Also in my manual the description of ASL is that as you drive road noise and backgroudn noise can get in the way, ASL will automatically adjust volume to compensate.

[sparq]

Originally posted by Devedander
Is it bad for subs to be played in reverse? Wouldn't it be bad to hook up pos to neg and vice versa?

Also in my manual the description of ASL is that as you drive road noise and backgroudn noise can get in the way, ASL will automatically adjust volume to compensate.

No to first question, "yes" to second...

First, + and - are not the same like on a battery. On a subwoofer, this only gives you instructions on how to connect the woofer for the proper ohm load and such. Since a "voice coil" is just that, a SINGLE coil with ONE starting point which continues, wraps around the "pole" piece and then out the other end (negative) this just tells you how to hook it up for normal phase... when you reverse this, you simple send power up the other direction -- not harmfull to your woofer. This is known as out of phase... you usually do this in subwoofer setups where one woofer is mounted normally, and then another woofer is mounted inverted and then wired "out of phase" to match it upto the other woofer...

ASL will increase radio volume as road noise increases.... jump on the highway, going 80 mph... its differant then cruising a city street at 35... personally this is a "lazy man" feature -- never liked it.

[iLLuCiv99]

Hey wait I think it's time once again for...

Originally posted by crxlvr
sparq got it right again

[xivera]

Originally posted by Devedander
Also in my manual the description of ASL is that as you drive road noise and backgroudn noise can get in the way, ASL will automatically adjust volume to compensate.

Hmmm... I guess mine is different...

[Devedander]

Xivera I think yours is SLA or something not ASL cuz mine has that too, so I can set different gain levels for AM, FM and CD. I just wondered how the ASL knows how lound things are, is there a little mic or something?

Thanks for your answers though.

[xivera]

Originally posted by Devedander
Xivera I think yours is SLA or something not ASL cuz mine has that too, so I can set different gain levels for AM, FM and CD. I just wondered how the ASL knows how lound things are, is there a little mic or something?

Oh... yeah, that's right! Damn, that ASL must be pretty cool then! (Perhaps, I need an upgrade! )

At any rate, it probably uses some sort of sensor/mic...

[-=BOOMER=-]

One other thing is that you can run a sub out of phase if it is far from where the rest of the system is, it will cause the sub to fire a little quicker or a little later depending on your choice. It helps if your subs dont sound right or a little slow in a system. prity much your trying to match when the wave of the midbase/highs hits your ear to be the same time that the wave of bass hits your ear. alot of times people mount there subs facing backwards, it helps well in those situations because the bass has to go to the back of the car and then "bounce" back to the front of the car. they do that so the wave of bass has more time to develop but it also has the tendency to slow down the arival time.

[Devedander]

Well I do face mine backwards so I will do more playing around with the reverse.