follow up on ZA 14 vs Fountek

[DDF]

Re: follow up on ZA 14 vs Fountek

I wonder if Martin King's spreadsheet could model port output changes with placement in a BR box? It models (accurately) port o/p in an MLTL

[r-carpenter]

Re: follow up on ZA 14 vs Fountek

looks like with the port moved away from the center line the magnitude of usable output slightly drops and ripples move slightly but don't decrease or increase significantly. it appears that the worst port positioning is directly behind the driver, lower magnitude of what we need and relatively higher and wider mid range leakage.
Green=directly behind the driver
Red= centered vertically in the upper section.

[r-carpenter]

Re: follow up on ZA 14 vs Fountek

Here's CSD of the port output. Left is again, port behind the driver and rite is upper section vertical center placement

[Pete Schumacher]

Re: follow up on ZA 14 vs Fountek

Here's CSD of the port output. Left is again, port behind the driver and rite is upper section vertical center placement

Now, do it again with some of stuffing . . . ;)

[r-carpenter]

Re: follow up on ZA 14 vs Fountek

now, this is what happens then you put padding on the walls. a fundamental standing wave is still there (equal in length to the longest dimension, about 11 inches in this case) but lower in magnitude. Padding is only so effective. I also find stuffing such as accustuff only marginally effective in the ported loudspeaker. Unfortunately then you keep on adding it, the usable output drops down in magnitude together with the ripples. Ahh no luck in life.
Peter, don't jump the gun I did.
Anyway, here my to blonds and 2 redheads.

[r-carpenter]

Re: follow up on ZA 14 vs Fountek

here's what the output looks like roughly after padding was added. Note: the over all level was changed in the process.

[Pete Schumacher]

Re: follow up on ZA 14 vs Fountek

now, this is what happens then you put padding on the walls. a fundamental standing wave is still there (equal in length to the longest dimension, about 11 inches in this case) but lower in magnitude. Padding is only so effective. I also find stuffing such as accustuff only marginally effective in the ported loudspeaker. Unfortunately then you keep on adding it, the usable output drops down in magnitude together with the ripples. Ahh no luck in life.
Peter, don't jump the gun I did.
Anyway, here my to blonds and 2 redheads.

Very cool!!!

Instead of Acoustastuff, try a hunk of Owens Corning 703 on the back wall.

[Wolf]

Re: follow up on ZA 14 vs Fountek

here's what the output looks like roughly after padding was added. Note: the over all level was changed in the process.

Is that Proac-Vifa the Neo-DX25?

I love Bird's Eye Maple!
Wolf

[r-carpenter]

Re: follow up on ZA 14 vs Fountek

Is that Proac-Vifa the Neo-DX25?

I love Bird's Eye Maple!
Wolf

yep. i got a few.

[r-carpenter]

Re: follow up on ZA 14 vs Fountek

been playing with the crossover modeling for a couple of days. Decided on 4th/2nd L/R electrical without notch. Will post modeled results in a day or so.

[r-carpenter]

Re: follow up on ZA 14 vs Fountek

small update. Modeled response with 4th order. Fountek/Vifa crossover
Tweeter was measured slightly of axis.

[r-carpenter]

Re: follow up on ZA 14 vs Fountek

and ZA14/vifa

[MSaturn]

Re: follow up on ZA 14 vs Fountek

man, those are both lovely pairs of speakers. I look forward to listening impressions.

[Paul Ebert]

Re: follow up on ZA 14 vs Fountek

Very cool!!!

Instead of Acoustastuff, try a hunk of Owens Corning 703 on the back wall.

Where can one buy 703?

[Pete Schumacher]

Re: follow up on ZA 14 vs Fountek

Where can one buy 703?

http://www.atsacoustics.com/item--Owens-Corning-703-Case-of-6--1004.html