wiring modification....thoughts?
Thread Starter
Former Vendor
Joined: Nov 2005
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From: Spring Texas
St. Jude Donor '08
wiring modification....thoughts?
I currently have 2 sets of Alpine SPX 177r components running off 2 Alpine MRP F250 amps (front and rear each get their own amp) I currenly have each amp bridged into 2 channels then use the included SPX crossovers to split into high and low frequencies.
The crossovers are capable of being bi-amped. Would it sound any better to use all 4 channels on the amps and run channels 1/3 to the woofer and 2/4 to the tweeter on the xover?
btw: current setup runs 100wx4 RMS; 180Wx4 peak
The crossovers are capable of being bi-amped. Would it sound any better to use all 4 channels on the amps and run channels 1/3 to the woofer and 2/4 to the tweeter on the xover?
btw: current setup runs 100wx4 RMS; 180Wx4 peak
Le Mans Master
Joined: Jun 2004
Posts: 5,572
Likes: 4
From: Los Angeles Ca
active x-over is usually between the head unit and the amp, it's adjustable and it requires a 12v source. passive is usually between the amp and the speakers and requires no power. you can power multiple drivers from one chan with a passive but with active you need a dedicated chan of amplification for each driver
Thread Starter
Former Vendor
Joined: Nov 2005
Posts: 8,995
Likes: 2
From: Spring Texas
St. Jude Donor '08
active x-over is usually between the head unit and the amp, it's adjustable and it requires a 12v source. passive is usually between the amp and the speakers and requires no power. you can power multiple drivers from one chan with a passive but with active you need a dedicated chan of amplification for each driver
Le Mans Master
Joined: Jun 2004
Posts: 5,572
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From: Los Angeles Ca
gives you more flexibility in tuning and adjusting x-over points. if your head unit has time alignment features then you can take advantage of t/a each speaker. a speaker distributor like alpine has to make a component set that will sound good in a wide variety of cars. by going active you can make sure that the components are set up specifically with your car in mind.
a few higher end head units (like the clarion drz-9255 among others) have 4 pre outs and pretty stout x-overs so you wouldn't even need an external active x-over. you could do everything internally keeping the signal path as clean as possible.
My last setup had an audio control 24xs then i moved to the alpine h701 and now i'm onto a phaze ldx23 since it has balanced in/outputs.
a few higher end head units (like the clarion drz-9255 among others) have 4 pre outs and pretty stout x-overs so you wouldn't even need an external active x-over. you could do everything internally keeping the signal path as clean as possible.
My last setup had an audio control 24xs then i moved to the alpine h701 and now i'm onto a phaze ldx23 since it has balanced in/outputs.
Last edited by scott_fx; Jul 28, 2007 at 06:36 PM.
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Thread Starter
Former Vendor
Joined: Nov 2005
Posts: 8,995
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From: Spring Texas
St. Jude Donor '08
Team Owner
Joined: Feb 2000
Posts: 51,504
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From: Sacramento CA
Do you know if you're having issues with your crossover point?
Those numbers are really suspect.
For example, here is the response of an 8" midbass I just ordered:
Red line: on-axis response
Green line: 30º horizontal
Blue line: 60º horizontal
On axis, Dyn calls it 35-3500
Yet off axis, in a car location, its down 20db at 4khz. So if you crossed it at 3500, you'll have issues.
The highest I'd expect to run it is 2k to get good sound out of it, in a car door install location.
More examples...
The Peerless SLS 8 ,a bad *** midbass:
Click
Look at all the break up at the top.
I say, if it costs you money, don't do it. If it just costs you some time to tinker with it, couldn't hurt to try. Don't cross that tweeter over lower than 2.5khz though.
Last edited by Kale; Jul 29, 2007 at 10:55 AM.
Pro
Joined: May 2007
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From: WayTooCloseToNY Northeast PA
There are still some small passive filter sections you should implement for each speaker for an active setup. Phase alignment and impedance stabilization are still a good thing. Are they absolutely necessary? No. Will they help? Yes.
Le Mans Master
Joined: Jun 2004
Posts: 5,572
Likes: 4
From: Los Angeles Ca
with members like kale, spkrboy, fej, and robvuck (to name a few) it would be a great learning experience.
could this be dealt with using a 30 band 1/3 octave eq? (I'm asking selfishly since my computer will be running eq software)
Pro
Joined: May 2007
Posts: 744
Likes: 0
From: WayTooCloseToNY Northeast PA
Thread Starter
Former Vendor
Joined: Nov 2005
Posts: 8,995
Likes: 2
From: Spring Texas
St. Jude Donor '08
I think for now I'm going to keep my current setup the way it is. I do plan on an update in possibly early 2008 that will include Alpine new SPX 17PRO speakers, PDX amps and possibly a new amp box....(i might be selling mine so keep your ears open)
thank you all for your assistance.
thank you all for your assistance.
Le Mans Master
Joined: Jun 2004
Posts: 5,572
Likes: 4
From: Los Angeles Ca
before you go and buy new speakers go spend some time at www.diymobileaudio.com
you can get a better sounding system for less $$$ by going active with better drivers
you can get a better sounding system for less $$$ by going active with better drivers