Feedback, opinions and thoughts

[lasse]

Hi all,

Please comment on the system in-being described in this link and the pictures below. If anyone has tried something remotely similar, all feedback is wellcome.

http://techtalk.parts-express.com/sh...d.php?t=230355


Regards//lasse

[Sydney]

Out of curiosity is there a reason behind the recessing? As opposed to a flat baffle covered with the same felt?
The felt should sufficiently dampen high frequency, but I would be concerned that there would be issues are lower frequencies with the drivers in that cavity.

[lasse]

Out of curiosity is there a reason behind the recessing? As opposed to a flat baffle covered with the same felt?
The felt should sufficiently dampen high frequency, but I would be concerned that there would be issues are lower frequencies with the drivers in that cavity.

Hi,

the "felt-and-cavity" design is an attempt to make the speaker more narrow-radiating, as was the thought in the original AR-MGC sidesystems, not to blur the direct sound from the main system and the delayed (20ms) side-beaming system . If you see the SPL-curve for the drivers (in the folder) strange things happen, but I think that this may be fixed with DSP.

regards//lasse

[Sydney]

If you see the SPL-curve for the drivers (in the folder) strange things happen,

Do you mean the linearity in general ( the valley above 600Hz ) or particular spots ( the ripples between 800 - 2Khz )?

[lasse]

Hi,

I mean all the irregularities in the responses from the drivers. I know that, in general, is isnīt a very good idea to install the drivers the way that I have done, in a cavity but this is/was the first attempt to focus the output in a more narrow beam than would be the case in normal mounting.

As perhaps some of you have read in my previous posts on other projects, I tend to aim for learning new stuff in my projects. And one of the topics in this would be to design a speaker with a deliberately "beamy" response, to meet the design goals for the cloning of AR-MGC, a somewhat extreme system.

If this will not work out as planned, well the worst thing will be that I have bought a lot of nice units (drivers, amps, DCX a. o. ) and this can be readily used elsewhere in future projects.

BUT I seldome give up whitout a real fight and will keep trying for a long time...(and ask you for advice and feedback)

Best regards//lasse

[Sydney]

Do you have flat baffle measurements of the same drivers?

[lasse]

Do you have flat baffle measurements of the same drivers?

Yes, but only at 10 deg and from my main system, which has the same mid and tweeter.

I would have liked to been able to present the polar plots from this mounting but I cannot. But the comparason with the data-sheet indicate a "better" directivity of abt 3-7 Db at a mix of 30 and 60 degrees.

I attach the 10 deg plots from the main speakers.

Regards//lasse