Pearl Acoustic Sibelius

[planet10]

You mean the modified alpair 10.3?

I mean, we can access A10.3 which is not the Sibelus driver.

Mods to the A10.3do not affect the bass alignment.

dave

 

[planet10]

Hi Dave, can you simulate the original 10.3 and 10.2 for us?

No. When i need a quarterwave design i ask Scott. @Scottmoose.

Given the access to stuff that hasn’t been published i would fold an A10.3 Festival into a rectangular box.

dave

 

[Hondasnl]

This will work for the 10.3 I think.
35L nett, transform it to a BR Cabinet with exactly the same "looks" and dimensions of the original Sibelius.
It will go nice and deep.

 

[vinylkid58]

35L nett, transform it to a BR Cabinet with exactly the same "looks" and dimensions of the original Sibelius.

WinISD won't give you an accurate simulation of a TL or TQWT.

jeff

 

[Hondasnl]

Just a box with slotted port and some inner panels. Nothing is accurate but give you a good beginning.

 

[Pierrick59]

your sibelius is average this no ? https://sites.google.com/view/low-e...y-tqwtml-voigt-pipe-with-damp-duct?authuser=0
your sims is better?

 

[Cindra]

Well, its not TQWT any more, so not Sibelius clone. I would not put that brace like that. MathCad worksheets by Marting King can be used for simulation if someone have access to them, maybe hornresp but I dont know how to work with that so not 100% sure

 

[Cindra]

your sibelius is average this no ? https://sites.google.com/view/low-e...y-tqwtml-voigt-pipe-with-damp-duct?authuser=0
your sims is better?

Its not sim on linked page but measuring results

 

[fullrangepointsource]

Well, its not TQWT any more, so not Sibelius clone. I would not put that brace like that. MathCad worksheets by Marting King can be used for simulation if someone have access to them, maybe hornresp but I dont know how to work with that so not 100% sure

Hello Cindra,
Yes it is not a simple TQWT it is a mass loaded TQWT (Voigt Pipe) and it may work a bit finer! Our dear "nandappe" stated:

"By making the opening of the enclosure duct-shaped, the frequency range below 300Hz can become flatter or the lower limit can be extended. Please give it a try once".

For a better understanding:

Regards to Zagreb

Stefan

 

[Cindra]

I understand, I was referring on last Hondasnl drawing and Winisd sim in which he changed box to bass reflex

 

[Hondasnl]

This will work for the 10.3 I think.
35L nett, transform it to a BR Cabinet with exactly the same "looks" and dimensions of the original Sibelius.
It will go nice and deep.

Here the simulation with the 10.2 in same BR cabinet.
Red 10.2 / green 10.3.

Simulations looks very nice.

 

[planet10]

Note that given the aspect ratio of the (so-called) BR box Hondasi posted will make it an ML-TL and WinISD can’t handle that.

dave

 

[Hondasnl]

And this?

 

[Vermouth]

Are the drivers used in the Cesti MBR closer to the Pearls custom driver units if someone wanted to clone as closely as possible? "the coil in the main driver was swapped for a coil utilising square section wire, creating a premium driver with flat impedance as frequency rises."

 

[Cindra]

Not even same line od MA drivers...no one will ever make Sibelius at home so best try to make something that will look alike with Alpair 10.3. Dimensions of Sibelius are known, so sims with stock driver than playing a bit with numbers to get something optimal if needed

 

[tigeranand]

These are really good (not all terminals can go through 18mm+ material). And sure ready if you get the crimps as well. Jantzen binding posts.

@tigeranand what amp are you using?

Hypex NC112MP

 

[mhenschel]

no one will ever make Sibelius at home so best try to make something that will look alike with Alpair 10.3

My two cents based on the comments in this thread as I understand 'em:
The Pearl and the 10.3M drivers are different and insofar as they differ any resultant loudspeaker systems will be different.
Reverse engineering the Pearl based on outward appearance, materiality and general design concept assumptions might be productive (while admitting to not actually having the particular Pearl drivers) but...
We have several worked out designs for the 10.3M driver by really brilliant fellows that we can build and have confidence in their performance: The Pensils (that relatively closely resemble the Pearl); the FHXL which might be an arguably better loudspeaker; and versions of the mass loaded Voigt pipe that is the basis for the Pearl (Festival or folded Festival).
There is a consensus that standard construction techniques with baltic birch would work better and be more straightforward to accomplish than variations on the thick solid oak cabinet. Technically, the internal dimensions are the important thing, not the enclosure materials.
In any event, the 10.3M should be EnaBl-treated or benefit form Dave's "simple tweak" or a notch filter.

I will probably Enabl my newly-acquired 10.3Ms and build either a Pensil or FHXL and try to be happy (and not cast envious eyes at expensive Finnish jewelry).

 

[Cindra]

There is also Nandappe TQWT or DDVP for Alpair 10.3.
I know that FHXL take some floor space, but I would not change mine just because of that, and as peace of furniture FH are really unique.

 

[mhenschel]

@Cindra
FHXL are my preference too (although if I was building speakers for someone else I'd lean towards the Pensils.
BTW... did you enabl the cones or install a notch filter?

 

[Cindra]

Nope, I dont need that. Made FHXL with Sota11R and Alpair 11ms and FHmk3 with Pluvia 7HD, didnt need notch on either....but Im switching amps and speaker cables from time to time and difference is quite big