[drphoto]

Back in my post about my initial OB bass experiment, Bob mentioned that semi-enclosed baffles...H & U types give more 'slam', while a large plain baffle gives more of the true OB flavor.

That got me thinking. If you're going to run multiple drivers (say 4) what about mixing it up? Say two flats, and two H types?

If I get two more GR servos, I might try this, but that won't be soon. So I thought I'd toss it out there for discussion. At this point, I'm still wetting my pants over what I get from just a pair of drivers in BABBs (big ass bob baffles) 

[drphoto]

Since I put up the first post, I went and threw on Metallica's "Black Album". With this type material, I see a limitation to a pair of drivers in a true OB arrangement. Ok at background levels, but 'stand on the gas' and the drivers run out of headroom to deliver that below the belt punch that is a big part of this type of music. Of course, it may not have anything to do w/ baffle design..... maybe I just need more drivers, which would both move more air and improve amplifier efficiency. (by paralleling 16 ohm drivers)

However, the experiment does raise the question of for realistic playback of music normally heard through a PA ie: hard rock, do we need to 'pressurize' the room? Is this something that can be done via OB? Do we need a mix, not only of OB baffles, but OB plus sealed type subs?

[454Casull]

However, the experiment does raise the question of for realistic playback of music normally heard through a PA ie: hard rock, do we need to 'pressurize' the room? Is this something that can be done via OB? Do we need a mix, not only of OB baffles, but OB plus sealed type subs?

Maybe, but not because of a need to pressurize the room. A rock concert takes place in a very large or boundless environment, meaning that there is no "pressurizing" to speak of.

[gainphile2]

Hi, I got 6x 10" on narrow-ish OB (30cm) and they deliver Metallica fine. That LF in "the struggle within' is most thunderous, OB or non-OB. They are using active SLP and then using linkwitz transform down to -3db at 20Hz, Q=0.75. I can't confirm using measurements as I do not have the space.

I'm not talking punchy bass though, but deeper and more authority than a lot of usual floorstanders+sub. The bass is only there when asked, not droning a.ka. "box effect". I understand that people learnt and  crave this box effect (me included, sometimes) and long for that doof doof sound to impress friends 

I have tried U-frames and H-frames and did not like them. Not sure why. Perhaps they make the polar response slightly different than the mids.

[Bob in St. Louis]

I'd like to receive ten cents every time you use the words or abbreviation "BABB", or "Big Assed Bob Baffles". 

The only 'mix' I've got are total OB from 40Hz on up with Infinite Baffle from 40 on down.
Not sure what mixing "O" and "H" or "W" would do or sound like? 

Bob

[drphoto]

Ok Bob.....checks in the mail. 

 I probably just need more drivers if I want metal rock concerts, but I thought a discussion of mixed baffles might be interesting.

For 90% of the music I play, the pair work suprisingly well.

[Bob in St. Louis]

Isn't there a speaker with a pair of subs in "W" on bottom with OB mids and highs on top?
One of Danny's maybe?

Bob

[454Casull]

Isn't there a speaker with a pair of subs in "W" on bottom with OB mids and highs on top?
One of Danny's maybe?

Bob

Sounds like the Phoenix.

[PDR]

That would be Dannys prototype for the Venues. He started with a W frame and then changed to a H
I am so far the only one that I know of that has a working pair. With the dual servo/driver combo I can say
that the bass is extreme (30w tube gear)...metallica sounds excellent....the best lows I have ever heard. What I should try,
and havnt is to have only one of the servos "on" and see what the difference is.....will try this tonight.

I know there are others in the works.....have seen one almost ready...a little different style than mine, and only 200mi
away...I live in Edmonton Alberta.

I compared these to a $25,000 pair of Sonus Fabers the other day.....lets just say I left with a big smile on my face.
They truly are unbelievable.

Perry

[drphoto]

Cool. What is the top mounted driver? I assume it's a co-ax. Is this a new offering from Danny? (maybe this was discussed elsewhere and I missed it)

As much as I like my Merlin/OB bass setup....I'd love to try full OB/dipole.

[PDR]

Here is a link to the "new OB" at at GR:

http://www.audiocircle.com/index.php?topic=61023.0

And one to my build:

http://www.audiocircle.com/index.php?topic=65750.0

[Telstar]

That would be Dannys prototype for the Venues.

They look nice, but i hope you could cover with some cloth. As they are now its not-WAFfable.

[PDR]

Thanks......they will be going into a dedicated 2ch man cave......

[ttan98]

Thanks......they will be going into a dedicated 2ch man cave......

One lucky Cave Man, with no interruptions from Wifey.

[Danny Richie]

That got me thinking. If you're going to run multiple drivers (say 4) what about mixing it up? Say two flats, and two H types?

If I get two more GR servos, I might try this, but that won't be soon.

\

They need to be loaded the same as the servo control sees them and controls them as one driver.

I am so far the only one that I know of that has a working pair.

There are quite a few out there already. There is even another playing pair near you in Calgary, AB.

[drphoto]

Ah, well that answers that. Thanks Danny. Guess when I get more drivers, it'll be BABBs all around. (another dime sent to Bob  )