Going active with the 9887

[James Bang 5,000+ posts]

1. Low-would be your sub set to 80hz so the highest note your sub would play is 80hz correct?2. Low mid- would be the lowest freq your mid would play which is 80hz correct?

3. High Mid- would be the highest freq your mid would play @ 3.2hz correct?

4. high would be the lowest your tweeter would play at which is 3.2hz correct?

In summary, your subs only play under 80hz, and at that crossover points your mids pick up anything from 80hz to 3.2hz and than anything higher than 3.2 your tweeter picks up and plays.

I think this makes sense.

I know that I have control of each speaker/channel through this head unit. Im still reading the manual on how I can change these settings for each driver.

Not exactly. The x-over points are not the start or end points. The speakers will still play content above or below the x-over points. This is where the slopes come in to play.

Say you have your sub LP'd @ 100hz.

If you have the slope set to 12db/oct, your sub will play higher than if you had your slope at 24db/oct, because 12db/oct rolls off slower and is not as 'steep' as 24db/oct

Here's a picture example:

 

[LaserRed38 10+ year member]

****n..let me know too!

 

[James Bang 5,000+ posts]

I really don't like how they switched from ms to cm or in for time alignment.

The new alpine HUs really seemed to have decreased in quality and performance, imo.

 

[nismos14 5,000+ posts]

Mine is VERY good quality compared to the old ones, seems like the things you listed are more symantics than actual quality issues.

 

[James Bang 5,000+ posts]

I also thought the build quality of them were as great as they were before.

The faceplates just don't feel as sturdy to me. Maybe I just miss my 9835

 

[krisfnbz 10+ year member]

Okay now this is where the problems start to arise.

I went ahead nismos and took the unit out, and switched the switch to 3 way on the actual physical unit itself. I figured how to set the crossover points for my tweets, mids and sub.

I still get the slight static noise, and now when I press and release my brake....their is this "BEEP" sound that comes. Also when I have my car in park, and press the button to switch it into the next gear... just by jingling it in park it creates static in my speakers, even when the volume is as low as just 1/25.

Im about to head home now...but this is freakin crazy. My coworkers have never seen this.

BTW My gains are still set for the old unit the 9883, and I still do have the 9883 harness connected. But this is freakin nuts. Only thing I can think of that is creating this static is the old wire harness from the 9883 where the yellow wire had that fuse box looking thing. But somehow I dont think this is the problem.

I am getting no alternator wine, as I never have with this car.

and I had no previous problems with the 9883 EVER... not anything at all!

 

[krisfnbz 10+ year member]

Not exactly. The x-over points are not the start or end points. The speakers will still play content above or below the x-over points. This is where the slopes come in to play.
Say you have your sub LP'd @ 100hz.

If you have the slope set to 12db/oct, your sub will play higher than if you had your slope at 24db/oct, because 12db/oct rolls off slower and is not as 'steep' as 24db/oct

Here's a picture example:

So your saying for my sub set to 80hz, if I have it at 24DB, it will play less higher freq's over 80 than setting it at 6db?

 

[nismos14 5,000+ posts]

^ correct.

I REALLY think you need to swap the harness.

 

[ngsm13 5,000+ posts]

All Alpines AFAIK are...

Front: Tweets

Rear: Mids

Sub: Subwoofer

That's how ALL of them have been back from the 9813 - 9855...

nG

 

[ngsm13 5,000+ posts]

So your saying for my sub set to 80hz, if I have it at 24DB, it will play less higher freq's over 80 than setting it at 6db?

Correct, look at the graphical cut-off point represented on the HU itself...

nG

 

[krisfnbz 10+ year member]

^ correct.

I REALLY think you need to swap the harness.

Well the only thing different would be the yellow cord. to which instead of swapping the whole harness and untapping EVERYTHING....I could cut the yellow little fuse part from the new harness and wire that into the exisiting yellow wire from he head unit to the factory wiring.

I mean its a little ghetto but its the same thing as swaping the older harness, with alot less work.

 

[nismos14 5,000+ posts]

All Alpines AFAIK are...
Front: Tweets

Rear: Mids

Sub: Subwoofer

That's how ALL of them have been back from the 9813 - 9855...

nG

Not the 9887, manual has confirmed and everyones experience has confirmed. REAR = tweets, FRONT = mids, SUB = sub.

Not logical, until you see the placement of the rca outs on the HU... but still pretty weird.

 

[James Bang 5,000+ posts]

So your saying for my sub set to 80hz, if I have it at 24DB, it will play less higher freq's over 80 than setting it at 6db?

yes, that's what i'm saying and what the picture shows.

I don't htink the 9887 has it, but the 9835 has a nice display that shows the x-over network like the picture i posted above

It helps a lot for us right hemisphered people

 

[krisfnbz 10+ year member]

So i still have this problem with static and "beeping" when I hit the brake.... and static when I am messing around with the shifter in park with my foot on the brake...

 

[nismos14 5,000+ posts]

Yea 9887 doesn't have that.