Markaudio Alpair 10.3

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#22
planet10 said:
I doubt that Harely is buying sufficent drivers to get a special version.

Sims have Pensil 10.3 hitting the same high 30s F6 anechoic same as sibelious. In room it will go lower.

View attachment 1057464

dave
Click to expand...
AFAIK, yes Harley's MA drivers have some slight modified drivers c/o Mark Fenlon himself.

It's in one of Harley's YouTube videos explaining how he got his version of MA right for his own design (Sibelius) via slightly tweaked drivers

Probably a close friend of Mark. Lucky guy
 
#25
planet10 said:
Why?

At the frequencies involved the internal structure makes almost no difference — the folds will introduce a bit of HP filter.

One can take a Woden Pensil, and easily transform it into am ML-Voigt (folded or not) that has the same response.Same volume, the pipe is 2x as long.

the shape of a voigt means a resonance train that is lower in frequency if the pipe flares. This makes them harder to damp the ripples and why you see a restricted terminus in most of the good ones.

dave
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I agree that in theory it makes no difference in folding but in reality it does, at least it did for me with a Tabaq that I folded, did not sound the same at all when folded. I did / do not understand why it did not sound the same but I will leave that for others.
 
#26
planet10 said:
Why?

At the frequencies involved the internal structure makes almost no difference — the folds will introduce a bit of HP filter.

One can take a Woden Pensil, and easily transform it into am ML-Voigt (folded or not) that has the same response.Same volume, the pipe is 2x as long.

the shape of a voigt means a resonance train that is lower in frequency if the pipe flares. This makes them harder to damp the ripples and why you see a restricted terminus in most of the good ones.

dave
Click to expand...
Dear Dave,

Why?
Sorry, I cannot explain the principle.
 
#27
Considering various designs with A10.3, if simplicity and ease of build is important, my vote would go for Pensils.
On the other hand, even though neither small nor optimized, a BiB seems to be an easy and quick build.
But, did anyone had a chance to hear both, and perhaps compare (A10.3 in Pensil vs. BiB)?
 
#39
Thanks Dave.

I've put the Alpair 10.3 data into the BIB spreadsheet ( https://speakerprojects.files.wordpress.com/2014/11/bib_calculator_v2.xls ) and I've got this data:

BIB Alpair 10.3.jpg


So it will be a 23.5 x 33.5 x h228.3cm cabinet, with the speaker at 131 cm from the floor composed by:
  • #4 panels 335x2283x18 mm (sides)
  • #4 panels 199x2283x18 mm (front&back)
  • #2 panels 199x299x18 mm (bottom)
  • #2 panels 199x2124x18 mm (inner)

Is it correct?
 
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