Hello all. I am not sure if this is the correct newsgroup to ask this
on or what... so here goes...

I lost my license (long story) and no longer need the subwoofers in my
truck. I want to build some nice enclosures and use them in my=20
apartment. My question is this: As you might all know, car audio=20
components are mostly 4ohm and home stereo is 8. I have a spare=20
channel on my antique Technics AV receiver (dolby pro-logic even ).
I want to drive these subs with this receiver. My question has to do
with crossovers. What will the difference in impedence do to the=20
crossover frequency and slope of some heretofore unpurchased passive=20
crossovers?

Thanks in advance for any comments/replies.

--=20
Regards,
Galen
------
There are only 10 kinds of people in the world. Those who understand=20
binary and those who don't.

On Mar 25, 6:45=A0am, "Galen Henderson" <galen-keep-the-
p...@hendersonsoftware.com> wrote:
> Hello all. =A0I am not sure if this is the correct newsgroup to ask this
> on or what... so here goes...
>
> I lost my license (long story) and no longer need the subwoofers in my
> truck. =A0I want to build some nice enclosures and use them in my
> apartment. =A0My question is this: =A0As you might all know, car audio
> components are mostly 4ohm and home stereo is 8. =A0I have a spare
> channel on my antique Technics AV receiver (dolby pro-logic even ).
> =A0I want to drive these subs with this receiver. =A0My question has to d=
o
> with crossovers. =A0What will the difference in impedence do to the
> crossover frequency and slope of some heretofore unpurchased passive
> crossovers?
>
> Thanks in advance for any comments/replies.
>
> --
> Regards,
> Galen
> ------
> There are only 10 kinds of people in the world. =A0Those who understand
> binary and those who don't.

You would probably using at least one series choke, and you have to
know the resistance. You can either read the specs or measure it.
Thats going to change the box requirements depending on resistance.
Unless your using a bandpass, the crossover frequency will set the
crossover frequency and impedance around that point.
greg

On Mar 25, 4:45=A0am, "Galen Henderson" <galen-keep-the-
p...@hendersonsoftware.com> wrote:
> Hello all. =A0I am not sure if this is the correct newsgroup to ask this
> on or what... so here goes...
>
> I lost my license (long story) and no longer need the subwoofers in my
> truck. =A0I want to build some nice enclosures and use them in my
> apartment. =A0My question is this: =A0As you might all know, car audio
> components are mostly 4ohm and home stereo is 8. =A0I have a spare
> channel on my antique Technics AV receiver (dolby pro-logic even ).
> =A0I want to drive these subs with this receiver. =A0My question has to d=
o
> with crossovers. =A0What will the difference in impedence do to the
> crossover frequency and slope of some heretofore unpurchased passive
> crossovers?
>
> Thanks in advance for any comments/replies.

My kid has some car subs and they were 2 ohm so be careful.

Why not include a subwoofer amp from Parts Express to your enclosure?

http://www.parts-express.com/wizards...=3DCAT&srchCa=
t=3D505

Then use the line level subout from your AVreceiver or the speaker
level inputs on the subamp with it's crossover.

You'll have a lot more flexibility in setting up your sub going this
route and won't load your receiver down with a load it can't handle.

ScottW

Hi, Scott.

On Thu, 25 Mar 2010 19:55:00 UTC, ScottW <(E-Mail Removed)> wrote:

>=20
> My kid has some car subs and they were 2 ohm so be careful.
>=20
> Why not include a subwoofer amp from Parts Express to your enclosure?
>=20
> http://www.parts-express.com/wizards...hExt=3D3DCAT&=
srchCa=3D
> t=3D3D505
>=20
> Then use the line level subout from your AVreceiver or the speaker
> level inputs on the subamp with it's crossover.
>=20
> You'll have a lot more flexibility in setting up your sub going this
> route and won't load your receiver down with a load it can't handle.
>=20
> ScottW
>=20

Thanks for your reply. These are 4ohm Cerwin Vega XL-15s. I do have=20
a spare 1200WRMS car amp, but I am afraid of what a dc power source=20
which can supply the kind of amperage it would require would cost. =20
Short of stashing a battery somewhere in the apartment, I can't think=20
of any other way to do it cheaply...

--=20
Regards,
Galen
------
There are only 10 kinds of people in the world. Those who understand=20
binary and those who don't.

Hello again. I wanted to use both B channels of the old Technics but=20
I guess I could wire the 4 ohm subs in series. I just hate to waste=20
100WRMS on an empty channel...

On Thu, 25 Mar 2010 19:55:00 UTC, ScottW <(E-Mail Removed)> wrote:

[ Excess quoting snipped -- dsr ]


> Why not include a subwoofer amp from Parts Express to your enclosure?
>=20
> http://www.parts-express.com/wizards...hExt=3D3DCAT&=
srchCa=3D
> t=3D3D505
>=20
> Then use the line level subout from your AVreceiver or the speaker
> level inputs on the subamp with it's crossover.
>=20
> You'll have a lot more flexibility in setting up your sub going this
> route and won't load your receiver down with a load it can't handle.
>=20
> ScottW
>=20


--=20
Regards,
Galen
------
There are only 10 kinds of people in the world. Those who understand=20
binary and those who don't.

Hi Galen,

If your subs are 4 Ohms nominal, to make them 8 Ohms, just wire them
together in series (which doubles the impedance) to the one channel and you
should be in business.

If you don't know how to do this, see this website for directions on how to
do it...

http://www.termpro.com/articles/spkrz.html

Happy listening!

-DJ

"Galen Henderson" <galen-keep-the-(E-Mail Removed)> wrote in
message news:(E-Mail Removed)...
Hello all. I am not sure if this is the correct newsgroup to ask this
on or what... so here goes...

I lost my license (long story) and no longer need the subwoofers in my
truck. I want to build some nice enclosures and use them in my
apartment. My question is this: As you might all know, car audio
components are mostly 4ohm and home stereo is 8. I have a spare
channel on my antique Technics AV receiver (dolby pro-logic even ).
I want to drive these subs with this receiver. My question has to do
with crossovers. What will the difference in impedence do to the
crossover frequency and slope of some heretofore unpurchased passive
crossovers?

Thanks in advance for any comments/replies.

--
Regards,
Galen
------
There are only 10 kinds of people in the world. Those who understand
binary and those who don't.