Subs R' Us. (1 Viewer)

[Jack Gilvey]

It's fun to be on vacation. As I type, I've got an IB sub(with a single Adire DPL12 and a 128ft^3 closet), a dipole sub( pair of DPL12's), and a PR sub (Dayton DVC,Lambda PR) operating in my room. All I do is move the speaker cable from the amp (Adire AVA250) to the sub I wanna use. Really interesting differences in sound and response. I'm finishing up a vented Shiva EBS for a friend, so I'll then have all the bas(s)es covered.


I did a quick, informal (RS meter w/ corrections, Sterophile Test cd1) FR comparison between the dipole and IB and found that, while the DPL12 infinite baffle was pretty damn flat over the last octave (actually up a little @ 20Hz referenced to 40Hz), the dipole fell only about 6dB down over the same octave (agrees with the theory, I guess). For these measurements, I'm only using one voice coil of each DPL12, so the Qts of the woofs is about 0.8. Really tough to get a feel for "smoothness" this way, since it's such a crude method.


"I'm a loser. I'm a loooooo-ser".
-John Lennon

 

[Jack Gilvey]

Alrighty, done with the EBS. Just about 141L with a full-length 4" flared port. Sounds great thus far, but we're having our inaugural viewing of The Fellowship of The Ring this evening, so that'll be telling (what a way to break in a sub,eh?).

 

[Pete Mazz]

Yea Jack, you'll know right away what kind of cahones it has with that soundtrack. I'll bring popcorn!
Pete

 

[Shawn Solar]

Ahh, that was the first movie I used to test my new DIY 1503. You never forget your first

 

[Jack Gilvey]

We did good. Thing performed like a champ @ 10dB below reference in my small room (~1400ft^3). Damn, there's low sh*t all over that DVD, and the EBS seems to get it all (powered with an AVA250).
Incidentally, I wound up not using the Sonotube I got, I went with an MDF box. Never again, too friggin' heavy.

 

[Pete Mazz]

Man, Pat's buildin boxes....Jack's buildin tubes....What's the world comin to?
Pete

 

[Jack Gilvey]

Hey Pete, those black fine-thread screws you sent worked like a charm on the MDF...no T-nuts this time, a real quickie this one. Even the port is duct-taped till I finalize the Fb.

 

[Wes Nance]

Jack,

How does the PR sub hang in there? I know it has a higher tuning, but would be interested in your impressions on the quality/character of the sound compared to the other offerings.

You really should snag a picture and post it of all those subs in the same room!

Wes

 

[Jack Gilvey]

Hey Wes,
The PR hangs in there just fine. The EBS definitely digs deeper (at over twice the Vb, of course), but I haven't really gotten to compare them on music at all.

You really should snag a picture and post it of all those subs in the same room!

It's crowded in there. I'll try to get a pic, kinda funny. My little green sub is in there somewhere also, along with a few other drivers/PR's and a massive Blueprint 1803. Oy.