this says ceiling speaker:
http://www.greatplainsaudio.com/vintage_altec/403A_ceilingspkr_spec_sheet.pdf
http://www.greatplainsaudio.com/vintage_altec/403A_ceilingspkr_spec_sheet.pdf
Open Baffle Epiphany!
- Thread starter cptnCanada
- Start date
Poultrygeist
Lunatic Member
I've seen ceiling speakers and car speakers used in OB.
These could be good OB options imo. I have a pair of Jensen 6x9 coax car speakers that I'm thinking of doing some cardboard experimenting with. Otherwise, there are a few full-range 6x9s out there that might work well.
Poultrygeist
Lunatic Member
6 x 9 Delco's have a high Qts and probably can be found on the cheap in junkyards.
cubdog
banging through drywall
I'm trying to wrap my head around OB bass response using different woofer configurations.
For example how much deeper do two Eminence Alpha 15s go than a single? What about using two 12 in woofers as opposed to one 15 or 2 15s? I'm really curious as to why two 12 in woofers are not more common given the baffle size needed to support two 15 in woofers.
Does a straight sided rectangular baffle produce more/better bass than say a curved cello shape or figure eight shaped baffle?
Lastly, for now,
how do two sides behind the woofer, picture a box with no top or back, impact the bass. I've seen something like this on various designs. I'm not sure if they are simply for support or have a sonic benefit. Thanks
cubdog
For example how much deeper do two Eminence Alpha 15s go than a single? What about using two 12 in woofers as opposed to one 15 or 2 15s? I'm really curious as to why two 12 in woofers are not more common given the baffle size needed to support two 15 in woofers.
Does a straight sided rectangular baffle produce more/better bass than say a curved cello shape or figure eight shaped baffle?
Lastly, for now,
how do two sides behind the woofer, picture a box with no top or back, impact the bass. I've seen something like this on various designs. I'm not sure if they are simply for support or have a sonic benefit. Thankscubdog
NeonDriver
Well-Known Member
For example how much deeper do two Eminence Alpha 15s go than a single? What about using two 12 in woofers as opposed to one 15 or 2 15s?
Does a straight sided rectangular baffle produce more/better bass than say a curved cello shape or figure eight shaped baffle?
Lastly, for now,
cubdog
Two 15's won't play significantly deeper bass than one 15, but they will be more efficient and couple with the room better. 15s are popular partly because the Eminence Alpha 15 has nice T/S parameters for OB bass. Two 10s or 12s with the appropriate Qts and Fs could work well also.
I don't think the shape of the baffle affects the bass so much as the overall distance from the front of the cone to the back. I think sides on the baffle increase the bass at the possible expense of less even dipole imaging. A wide baffle would have a similar effect.
cubdog
banging through drywall
Everything is a compromise I suppose. I have no issues with using two 15 inch on each side as long as there is a real sonic benefit. As I have said before, I'd prefer, from an aesthetic point of view not to. My room, if it matters, is about 20x30. I wish I had more experience with DIY speakers. It would make these decisions much easier.
cubdog
Ya, I vaguely remembered seeing full-range Delco 6x9s some years ago.
Now I notice brand-new Delco F-R 6x9s on eb*y for $10 a pair with shipping running $15 or so. These are apparently for 2000 year model or so cars and trucks. Could be interesting...
Poultrygeist
Lunatic Member
A room 20 X 30 could support some big honkin' OB's :yes:
cubdog
banging through drywall
I can't wait to get started. I've been doing a bunch of research and started sketching design ideas. I'm pretty set on the driver selection but I'm not sure which active crossover to go with. I'm not sure if that cheap Berhringer is the way to go or if I need to invest in a better unit. Thoughts anyone?
cubdog
tomlinmgt
Lunatic Member
All of my exposure to Behringer products has been in pro PA. Any time we'd play a gig where the house provided sound and I saw Behringer gear I got concerned and more times than I care to remember my concerns were validated. It wasn't the sound that was an issue, it was reliability. I know there a plenty of guys in home audio who have used their equipment with great success, but I've seen and experienced more issues with that one brand than any other. I keep my distance. For active analog I like Ashly and Rane. Affordable, reliable, and clean sounding (to my rookie ears). But like Dave said, minidsp is the hot ticket and no doubt about it will be my next stop.
- Michael
tomlinmgt
Lunatic Member
What software/program are you favoring currently, Dave?
cubdog
banging through drywall
Due to my lack of understanding about how crossovers work, or in fact about speaker mechanics in general, I need to choose the most simple control system. Money, to some extent also comes into play. While I don't want to cut corners, I must by necessity, control my budget. I will do some more research into the MiniDSP to see if they are a viable option. Thanks for all the suggestions.
cubdog
tomlinmgt
Lunatic Member
As I alluded to earlier, I have found no better way to get a grasp on how a crossover (active or passive) affects driver interaction and the result of changing crossover points for individual drivers than twisting some knobs and hearing the changes on the fly. Things start to make sense pretty quickly.
Yep, one of the above will be my "back up plan" if things don't go well enough. No telling how many PC based DSP programs there are out there...
Poultrygeist
Lunatic Member
I bought the Ashly from P.E. for $250. It's said to share many of the internals with the high priced Marchand. I figured if it didn't outperform the $90 Behringer ( which I still use ) I could get most of my money back on ebay. But it's a keeper and invisible in my system.
