Pure Audio Project upgrades and tweaks

Kingrex · Thursday at 7:47 AM

DasguteOhr said:
You can change all parts at beyma coax its professionell driver , you need only a other 1" diaphargma.
If you want to try the Fostex, remove the diaphragm and you will have only a 10" driver.
1" diaphragms are available from many manufacturers in all imaginable materials. Aluminum, berylium, titanium, polydyne, etc. Only the terminals must fit in the pressure chamber lid.

1" diaphragma horn driver - Google Search

View attachment 155087

I use 1" horndriver without the lid , then it works as dipole. Advantage reduces distortion that occurs in the pressure chamberView attachment 155088

The image of your driver seems to be a CD for the tweeter that has its own magnet.
I sort of wondered what would be the issue of having a second magnet. As long as the bolt holes fit. I guess a spacer could be made to accommodate holes. But, the diaphragm is going to be further back. Possibly inducing timing issues???

What if I used that Fostex and used heavy duty double sided tape to mount it to the back of the 10" driver. I would of course find some additional way to secure it.

If I just changed the diaphragm, would I get much of a performance gain??? Or just another sound. Everything else would remain the same. The magnet, wiring etc???

I need my new microphone before I do anything else. I want accurate measurements.

Kingrex · Thursday at 7:56 AM

Alrainbow said:
Looking at this graph the graph is very uneven in many places.
the 8 to 10k might be a resonant peak
the fall off does seem fast.
But a typical room sweep does not always need to be flat.
one thing to start is on axis 3 feet back to confirm the output of the driver

Could be Al. I wasn't able to find my pile or resistors yesterday. They are buried in the work. I have another place to look. I think it has always fallen off. But the peak could be the room. I can try another sweep in front of the speaker and mute one channel. See what happens. I don't have them toed in much. Maybe 5*. But that may do something to create a peak.

I am ok with the roughtness. What I really wanted was a gentle slope with a high on the bass and slight down on the treble. At least I want to try that.

DasguteOhr · Thursday at 8:56 AM

Kingrex said:
The image of your driver seems to be a CD for the tweeter that has its own magnet.
I sort of wondered what would be the issue of having a second magnet. As long as the bolt holes fit. I guess a spacer could be made to accommodate holes. But, the diaphragm is going to be further back. Possibly inducing timing issues???

Beyma have two models of a 10" coax driver diffrent year of build. No timing issuses the way is too small

Kingrex said:
What if I used that Fostex and used heavy duty double sided tape to mount it to the back of the 10" driver. I would of course find some additional way to secure it.

Bad idea, you're robbing the Fostex of all its strength, resolution, and beam angle. Drill a hole in the coax baffle and push it through flush. Make the hole a bit larger for a gasket around the Fostex.

Kingrex said:
If I just changed the diaphragm, would I get much of a performance gain??? Or just another sound. Everything else would remain the same. The magnet, wiring etc???

Different materials can make your ear feel like it is playing louder

Kingrex said:
I need my new microphone before I do anything else. I want accurate measurements.

Best idea today correct measurement 1m distance height of the coax
I've tried all sorts of drivers in Open Baffle last 8 years , but no standard driver has made me completely happy in the long run. All my drivers have been modified, for example, drilling holes in the magnet to change the TS parameter or QTS value.

Kingrex · Friday at 10:26 AM

I was watching a video on Von Schwikert speakers. They use multiple tweeters. I may try to pull down the hump, then add a second dipole tweeter.

Pure Audio Project upgrades and tweaks

Similar threads