I've been messing about with a sweep generator, it confirmed my suspicions,
that my crossovers are all wrong, especially with my sub.

I'll describe my system a little, a sprawling rooting trip through many
second hand stores with a student budget...

The most common source for sound is my PC (silent - no fan noise!), but I
also have a rather nice Technics SL-Q33 tt. These both feed into a Denon
UD-30, that little CD receiver that you see quite a lot of, I paid full £
on that back when I wasn't so savvy to hifi bargains.

My main speakers are Mission, branded Denon, that came with my receiver.
SC-M50s. They're very similar to other compact Mission bookshelves, have a
stated response down to 75Hz and are 50w.

I bought a sub recently, a 2nd hand Mission 73PS, which is a passive and
100w. Inside it there is a large coil that I presume is a crossover; it
doesn't seem to have much effect, but there are no obvious shorts. I didn’t
really think at the time how I'd actually power it, but managed to find a
dusty old stereo receiver, a rather nice Sansui R-30. My only really decent
interconnect is used from the mono pre-out of my Denon to the line-in of
the Sansui, AFAIK the pre-out doesn't apply crossover filtering.

The problem is that the sub is playing too high notes, giving it's position
away and causing a hump where the sound is coming from both the sub and
sats. What do I need to solve this problem? Also, is it likely to cause a
problem that my satellites are getting notes lower than they can play?
Somebody suggested to me that I could use a crossover from a car stereo, is
this a good idea?

One last thing... does anyone know where I can order speaker spikes online
for a reasonable price?

--
Jim

Since you didn't get the appropriate powered sub for this application,
consider getting a sub-amp with built-in crossover. As for DIY, you
can build an active LP filter for the input to the Sansui or a passive
LP for around 50Hz.

Kal

On Sun, 06 Jul 2003 15:14:09 +0100, Jim H
wrote:

I've been messing about with a sweep generator, it confirmed my suspicions,
that my crossovers are all wrong, especially with my sub.

I'll describe my system a little, a sprawling rooting trip through many
second hand stores with a student budget...

The most common source for sound is my PC (silent - no fan noise!), but I
also have a rather nice Technics SL-Q33 tt. These both feed into a Denon
UD-30, that little CD receiver that you see quite a lot of, I paid full £
on that back when I wasn't so savvy to hifi bargains.

My main speakers are Mission, branded Denon, that came with my receiver.
SC-M50s. They're very similar to other compact Mission bookshelves, have a
stated response down to 75Hz and are 50w.

I bought a sub recently, a 2nd hand Mission 73PS, which is a passive and
100w. Inside it there is a large coil that I presume is a crossover; it
doesn't seem to have much effect, but there are no obvious shorts. I didn’t
really think at the time how I'd actually power it, but managed to find a
dusty old stereo receiver, a rather nice Sansui R-30. My only really decent
interconnect is used from the mono pre-out of my Denon to the line-in of
the Sansui, AFAIK the pre-out doesn't apply crossover filtering.

The problem is that the sub is playing too high notes, giving it's position
away and causing a hump where the sound is coming from both the sub and
sats. What do I need to solve this problem? Also, is it likely to cause a
problem that my satellites are getting notes lower than they can play?
Somebody suggested to me that I could use a crossover from a car stereo, is
this a good idea?

One last thing... does anyone know where I can order speaker spikes online
for a reasonable price?

On Sun, 06 Jul 2003 11:54:22 -0400, Kalman Rubinson wrote:

Since you didn't get the appropriate powered sub for this application,
consider getting a sub-amp with built-in crossover. As for DIY, you
can build an active LP filter for the input to the Sansui or a passive
LP for around 50Hz.

Thanks. Does anybody know a good site explaining how to build this kind of
filter? I have some electronics knowledge, but only to a general physics A-
level (and that was took 3 years ago)

Or maybe I'll take the easy option and get that sub amp, they seem a bit
expensive though, and hard to get good information/reviews on.

--
Jim H

On Sun, 06 Jul 2003 17:56:30 +0100, Jim H
wrote:

On Sun, 06 Jul 2003 11:54:22 -0400, Kalman Rubinson wrote:

Since you didn't get the appropriate powered sub for this application,
consider getting a sub-amp with built-in crossover. As for DIY, you
can build an active LP filter for the input to the Sansui or a passive
LP for around 50Hz.

Thanks. Does anybody know a good site explaining how to build this kind of
filter? I have some electronics knowledge, but only to a general physics A-
level (and that was took 3 years ago)

Or maybe I'll take the easy option and get that sub amp, they seem a bit
expensive though, and hard to get good information/reviews on.

Get a copy of Dickason's Loudspeaker Cookbook.

Kal

Hi,

In message , Jim H
writes
On Sun, 06 Jul 2003 11:54:22 -0400, Kalman Rubinson wrote:

Since you didn't get the appropriate powered sub for this application,
consider getting a sub-amp with built-in crossover. As for DIY, you
can build an active LP filter for the input to the Sansui or a passive
LP for around 50Hz.

Thanks. Does anybody know a good site explaining how to build this kind
of filter? I have some electronics knowledge, but only to a general
physics A- level (and that was took 3 years ago)

Try the Wilmslow Audio site, at http://www.wilmslow-audio.co.uk
They may have a suitable design available, and if not they have a
reasonably priced design service for crossovers. The final design will
depend on what order filter you want, which will depend on your main
speakers.

--
Regards,
Glenn Booth