Open Baffle Epiphany!
- Thread starter cptnCanada
- Start date
Poultrygeist
Lunatic Member
It's been my experience that full range drivers larger than 8 inches warrant a tweeter whereas smaller ones will play high enough to go it alone.
I have the audio nirvana 12" and certainly don't need tweeters for them
Poultrygeist
Lunatic Member
My 12" Beta LTA's and Zeniths both benefit from tweeters as did the Pioneer Bofu. I originally thought the Zeniths played high enough but when I added the super tweeters I realized that I had been missing much of the shimmer from the high hats.
Think that is it
Probably someone suggested you try a "1st draft" using the pink insulation board you can get at Home Depot. That is what I did and it helped me try out different options.
More important if you are not using helper woofers.
Have fun!
Probably someone suggested you try a "1st draft" using the pink insulation board you can get at Home Depot. That is what I did and it helped me try out different options.
More important if you are not using helper woofers.
Have fun!
mkane
Lunatic Member
My wood is 3/4" plywood and if the foam is cheap I'll try that first. I'm going to make these so the full ranger can be swapped out. Thanks http://www.quarter-wave.com/Project09/Project09.html. Somewhat concerned about where should I locate the full range unit or does this matter.
I would follow martin's template from project 9
That's the plan but, my full range speaker's quite a bit bigger than his. I'll just use his c-c measurements. My wife knows these are coming.
Poultrygeist
Lunatic Member
If you're going to use a plate amp I'd first try it low passing the woofers ( sans the Rolls ) and with the full range speakers running full range. If you don't like the sound then buy the Rolls.
Poultrygeist
Lunatic Member
Means using the low pass crossover on the plate amp
martin king recommends against what PG is suggesting as he finds you get a "mound" where the FR and woofer drivers overlap. i see this when i do the crossover settings using my miniDSP. however, makes sense to try it and see how it works for you. do take a look at the response curve for your FR driver and set the low pass for the woofers accordingly.
Poultrygeist
Lunatic Member
The problem with using an active crossover and SET amp ( assuming mkane is using his ) is the active takes away much of the triode magic. The sound is probably more accurate with an active but at what price? I own a nice Ashly but it sits unused in a closet as I don't like what it does with my SET amp. If I used a SS amp like MJK I might prefer an active.
essNeff
Active Member
M. King's "Plan 9 from Outer Space" OB's used a 2nd order 200hz LP and a 500hz hp to minimize BP gain (hump).
These numbers were specific to the Fostex 103E FR he used in the example.
I would assume that the larger FR drivers would beam quite a bit at higher frequencies narrowing the sweet-spot of the FR.
It makes sense that this "hump" would occur at lower Hz. with the larger drivers. (8 or 10 incher's).
I guess some experimentation with this issue would be necessary to get it about right.
An a\Active XO could be of help here.
These numbers were specific to the Fostex 103E FR he used in the example.
I would assume that the larger FR drivers would beam quite a bit at higher frequencies narrowing the sweet-spot of the FR.
It makes sense that this "hump" would occur at lower Hz. with the larger drivers. (8 or 10 incher's).
I guess some experimentation with this issue would be necessary to get it about right.
An a\Active XO could be of help here.
mkane
Lunatic Member
thanks