Looking for the Right Sub

doug s. · « **Reply #20 on:** 24 Jun 2004, 05:36 pm »

Quote from: astronaut_glen

an excellent sub is the Allegro by an indipendant canadian manufacturer ISD. it is incredably fast and musical. a small 7 1/2" isobaric driver. which means there are two drivers sealed together inside front to back facing the same direction. the result is they move more air like a bigger driver but mover very efficiently like a smaller cone.

the website isn't much to look at but check it out www.athomehifi.com.
give the guy a call you will not be disapointed

even if the $1300 is canadian, that's still ~$970 usd. *each*. for that amount of money, there's no way i'm not gonna get a pair of vmps', and an outboard active x-over & amp...

doug s.

SteveRB · « **Reply #21 on:** 25 Jun 2004, 03:03 am »

why do you need two subs? any sound the sub generates is pretty much unidirectional. read this it makes sense:

http://val.dorta.com/audio/archives/000109.html

JohnR · « **Reply #22 on:** 25 Jun 2004, 03:06 am »

Quote from: astronaut_glen

a small 7 1/2" isobaric driver. which means there are two drivers sealed together inside front to back facing the same direction. the result is they move more air like a bigger driver but mover very efficiently like a smaller cone.

Technical correction: an isobaric moves exactly the same amount of air as a single cone, and it is also 3dB less efficient. The advantages are a smaller box, and possibly some distortion reduction if the drivers are face to face.

I have isobaric subs

SteveRB · « **Reply #23 on:** 25 Jun 2004, 03:16 am »

john r

cool thanks for the correction

Rob Babcock · « **Reply #24 on:** 25 Jun 2004, 04:31 am »

There are a couple advantages to using two subs. The first is obvious- more bass energy. You may desire more output due to listening preferences or you might have a larger room than one sub can pressurize effectively. A second advantage is that by placing subs in different locations, sometimes you can get more even bass response by engaging different room modes. This takes a lot of work & measurements, but sometimes yeilds flatter deep bass.

ctviggen · « **Reply #25 on:** 25 Jun 2004, 01:15 pm »

I've tried having one sub with stereo music, and I can't take it. I can hear where the sub and also there's a reduced stereo effect. I think the studies are bunk.

doug s. · « **Reply #26 on:** 25 Jun 2004, 02:06 pm »

Quote from: astronaut_glen

why do you need two subs? any sound the sub generates is pretty much unidirectional. read this it makes sense:

http://val.dorta.com/audio/archives/000109.html

it may make sense when you *read* it, but when you *listen*, then it no longer makes any sense!

even if you cross over as low as 50hz, unless the sub is *exactly* centered between the speakers, you *will* be able to localize it. and, w/this location, the best-case scenario will be no change in soundstaging. if you have two subs, placed flanking your mains, the soundstaging will actually improve.

others' comments about less room interaction difficulties, & more spl/less distortion definitely apply w/two subs vs one sub.

ymmv,

doug s.

SteveRB · « **Reply #27 on:** 25 Jun 2004, 03:24 pm »

woah...
call me humbled...

but i use only one sub. i do have it centered with the level low and it disappears into the soundstage with the mini-monitors. i can agree with the argument for more power.

doug s. · « **Reply #28 on:** 25 Jun 2004, 04:41 pm »

Quote from: astronaut_glen

woah...
call me humbled...

but i use only one sub. i do have it centered with the level low and it disappears into the soundstage with the mini-monitors. i can agree with the argument for more power.

glen, yure making the best of using only one sub - don't feel bad! ;~)

regards,

doug s.