John,

They are old Skool AL6 (my fave tweets from a/d/s).  I have them mainly
because I use a/d/s in my studio for hi-fi reference.  I have found that the
al6 translates well with the L570's.  I am using an MTX pro4005 each AB
channel goes to a mid or tweet and the D channel to a single 10JL.   The 6
plays from 75-2200 and the tweet from 2500 on out.  The underlap is due to
the peak in the 6" poly cone, I have not found the smaller drivers to have
this peak.  I would rather underlap crossovers than use an EQ.  I homebrewed
the crossover using burr brown OPA series op amps, but soon would like to go
to digital processing for driver control.  The tweets are in the kick panels
and the 6's in the doors, digital will allow me to delay the 6's a tad and
then delay the whole left side to get my pathlength correct.

After going active I found the dynamics (mostly transient response) to
improve greatly, you can hear the hammer hit the piano string, I also
noticed more overtones being conveyed. They still have the appelaing a/d/s
signature but also will flat out get at it.  It seemed the stock crossovers
were really holding them back under power.  I never built new passiaves for
them, just went straight for the biamp.  It's a simple system that I built
for SQ, 5 drivers, 5 channels of amp.  For it's simplicity I am extremely
happy with it.  The bass heads don't dig it much, but being a live engineer
and mastering engineer I needed something that translated well to the real
world, this rig gets it done and I trust it.  I'm getting ready to retire
this vehicle for grunt work around the property, I'm looking at a Dodge
Magnum, sooooo I hope to build another system that makes me as happy as this
one :)  Hopefully by that time I will have my 850MX done (got a blown
channel, been lazy on the bench)  I have the active modules for the al6's, I
just need to find another used set, that's the challenge.

What changes did you notice going biamp?  Are you farmiliar with the AL6?
How much different do the new a/d/s sound?  I have found the new breed of
car audio tweets to be too screechy. My last install had Morel MDT30's and
their MW220's. I may go back to that route if I can't find a car driver that
satisfy's me.

Chad
Chad, which model crossovers? I'm curous if you ran into that problem on the
current cs series product or one of the older series?

I am running the 346cs fully active myself and am just amazed at the overall
performance of the drivers...

Thanks,

JD

Chad Wahls wrote:

Mark, Im not so sure you know what your talking about...

Of course I don't.  I make it up as I go along.

If the ADS speakers recomend a bi-amp hookup they probably
are set up to still use the ADS passsive xovers.... So yes, in this
case, you WILL NOT use the electronic xovers in the amplifiers
(if any), you will simply use another input to the passive xovers
and in this case you wont need to add a cap like you recomended
either.

Right.  But this doesn't mean that he can't biamp his a/d/s/ speakers with
active xovers.  Sometimes it's beneficial, as long as you know what you're
doing.  In fact, I'm currently triamping my a/d/s/ 3-way component set,
using the active xovers in my a/d/s/ and Orion amps to do it.  For this
set,
I like the ability to level control moreso than the ability to change the
crossover point.  I agree with your assessment of a/d/s/ xovers.  They
sound
fine at the freqs/slopes selected.  This, of course, could change
depending
on the car, mounting location, etc.

There are some speakers though that don't sound good until you replace the
xovers.  The set of Morels that I currently have in the back (used to be
in
the front in my last car) are an example, and they were downright
unlistenable with the factory xovers, IMO.  I also had some Rockford
components back in the day that I had to build entirely different passives
for, just because the factory xovers did them no justice.  And then
sometimes xovers that don't include the little tweeter attenuation switch
in
them sometimes need to be replaced altogether if the relative levels
aren't
what you like.

I have a mulit amped rig in my truck, each driver has it's own channel.  I
found my a/d/s crossovers to be power hogs and they actually caused great
distortion during dynamic piano listening.  Although they appeared to be of
high quality I found the sound to improve greatly after careful processing
and proper amplification.  Maybe the crossovers were bad? could be!  But I
have found the imaging and dynamic response greatly improves with nothing
passive in the way.

Chad