I wanted to add a plate amplifier to the H frame I am currently building. Parts express has a amp with 6 dB of boost at 30 Hz, and an identical plate amp without the boost. Looks like there is no defeat on this option
Do I have to worry about boosting this much when this is so close to the drivers Fs
Thanks,
Paul
Do I have to worry about boosting this much when this is so close to the drivers Fs
Thanks,
Paul
I keep coming back to this thread to check the latest developments...
I am wondering if any of you have implemented this Goldwood woofer in an open baffle 3 way.
I would love to experiment with it but I've found that I don't like fiddling with bi-amping and active xo's and would like something with a passive xo that I can run from a single amp.
I am thinking of a BG NEO 3 run as a dipole for the top end, the Goldwood on the bottom and an "as yet to be named" midrange that would cover as much bandwidth as possible. I like the OB 3 way in another thread but it is WAY out of my price range.
I am wondering if any of you have implemented this Goldwood woofer in an open baffle 3 way.
I would love to experiment with it but I've found that I don't like fiddling with bi-amping and active xo's and would like something with a passive xo that I can run from a single amp.
I am thinking of a BG NEO 3 run as a dipole for the top end, the Goldwood on the bottom and an "as yet to be named" midrange that would cover as much bandwidth as possible. I like the OB 3 way in another thread but it is WAY out of my price range.
how about Alpair 10FR?
and will ALPAIR 5 too small for the goldwoods?
i heard the JAMO's OB, its quite stunning.
And im not satisfied with ALpair's bass dynamics from their JG's ML-TL
,
PE is selling $86.65 each for the goldwood now. Parts-Express.com: Goldwood GW-1858 18" Pro Woofer | 18" woofer 18 inch woofer midbass driver pro sound sound reinforcement PA goldwood-41108 huntwoofer123008, it looked good for its price.
cheers
and will ALPAIR 5 too small for the goldwoods?
i heard the JAMO's OB, its quite stunning.
And im not satisfied with ALpair's bass dynamics from their JG's ML-TL
,PE is selling $86.65 each for the goldwood now. Parts-Express.com: Goldwood GW-1858 18" Pro Woofer | 18" woofer 18 inch woofer midbass driver pro sound sound reinforcement PA goldwood-41108 huntwoofer123008, it looked good
for its price.cheers
Hi Martin,
I decided to follow your design, using the Alpair 10 as i asked on the previous post.
I have this questions :
1. Is the baffle size is equal to the size of baffle of the woofer?
2. What would be ideal placement for the fullrange?
3. What if i put the ALpair on the center alignment with the woofer?
Thanks
Cheers
I decided to follow your design, using the Alpair 10 as i asked on the previous post.
I have this questions :
1. Is the baffle size is equal to the size of baffle of the woofer?
2. What would be ideal placement for the fullrange?
3. What if i put the ALpair on the center alignment with the woofer?
Thanks
Cheers
Hi Albert,
I have been listening to the F120A on and off now for a few months and have not been overly impressed. If I had to pick between the Jordan JX92S and the F120A, I would select the Jordan. The Jordan costs less and I believe sounds better.
Last edited:
Hi Henry,
I believe that either the Alpair 10, Alpair 6, or the CHR-70 would all work well with the Goldwood H frame. I have not done the detailed design work so I do not know what baffle size, driver position, or crossover would be optimal. I think that there is an advantage to keeping the baffle size the same and offsetting the driver slightly in the baffle, that geometry is what dictated the crossover frequency and order so that the combined SPL respnse was flat on axis. If you change those variables you might need to rethink the crossover.
Hi Martin,
Would u mind guide me, which formula to calculate baffle size and driver offsetting?
I guess the Alpair is too small.
Im planning to use active crossover, either dbx 234 or behringer ultradrive, since im not that good on experimenting with crossover.
How about the baffle size of your JX92S? since i have jx92s, alpair 10, alpair 5, i might as well try it all.
cheers
Would u mind guide me, which formula to calculate baffle size and driver offsetting?
I guess the Alpair is too small
. Im planning to use active crossover, either dbx 234 or behringer ultradrive, since im not that good on experimenting with crossover
.How about the baffle size of your JX92S? since i have jx92s, alpair 10, alpair 5, i might as well try it all
.cheers
I cannot do the design work for you, I just don't have the time. I don't know of a simple formula to tell you how big of a baffle or how much to offset the driver. The only way I know how to do it is with simulations.
I guess the Alpair is too small
Im planning to use active crossover, either dbx 234 or behringer ultradrive, since im not that good on experimenting with crossover
I think that is a great idea, it will allow you to try all different kinds of crossovers at no cost to find the best combination. I would probably recommend the Behringer unit since it will allow you to vary the crossover slopes and frequencies. I believe the dbx unit might only allow you to change frequencies and locks you into the slopes, I think the dbx 234 uses 24 dB/octave. Spend a little more money for the Behringer, it will make your life easier and allow greater flexibility.
That would be a safe starting point in my opinion. You could also start smaller and add peices to the sides to make it bigger if small did not work. Building a new baffle to stand on top of an H frame is easy, quick, and cheap.
The OB with the Jordan or Fostex driver is 20" x 20" and sits on top of the H frame. It is not attached so it can me moved forward and back and tilted towards the listener. The driver hole center is 7" from the insde edge and 9" from the top edge. The description of the OB dimansions can be found on page 7 of the original article under Project 8.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.