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opa1 16th September 2012 09:13 PM

NOS Betsy k's Pioneer Build
 
I just recieved a pair of NOS hemp matrix Betsyk's. I have dims. for a small MLTL.[38.5x8.5x13.5 inside dims]
I just built the big MLTL's. I'd like something smaller. The pencil designs look good. No dims for betsyk though.

What would ya'll like to see built? Something new? Give me some ideas. Bibs are out for now.

Mark

fastbike1 17th September 2012 12:35 PM

Ok, put 'em in a Karlson XK8.


Quote:

Originally Posted by opa1 (Post 3167509)
I just recieved a pair of NOS hemp matrix Betsyk's. I have dims. for a small MLTL.[38.5x8.5x13.5 inside dims]
I just built the big MLTL's. I'd like something smaller. The pencil designs look good. No dims for betsyk though.

What would ya'll like to see built? Something new? Give me some ideas. Bibs are out for now.

Mark


nesha 17th September 2012 01:13 PM

Here is my experience with BesyK http://www.diyaudio.com/forums/wild-...l-tl-tqwt.html
I think that she needs big box, whatever concept you choose it's going to end on the big side...

opa1 17th September 2012 04:20 PM

I've built the 48x21x14 mltl's. They work great. Just looking for another approach.
I'll narrow down the requirements some.
Powered by SEP tube amp. 10x10 room. Run at low volume. No sub support. Space taken up is important. Z height around 36" would be nice.

Ok, put 'em in a Karlson XK8.
Have you modeled a enclosure? Would stands be required?

fastbike1 18th September 2012 12:18 PM

Based on the measured T/S of my pair, they also model very well in 61 liters net BR tuned to 46.7 Hz. F3/F10 52/38. Flat response, 100dB w/ 5 watts Over xmax below 40Hz.

The box I modeled fits your requirements: 34.5"H x 17"w x 9"d (trying for wide baffle).

I've found they model well in BR anywhere from 61liters net to 99 liters. At 99 liters the port is just a 3" hole in 3/4" material.

All about the same output, just progressively lower F3/F10 as the box gets bigger. All flat FR


Quote:

Originally Posted by opa1 (Post 3168342)
I've built the 48x21x14 mltl's. They work great. Just looking for another approach.
I'll narrow down the requirements some.
Powered by SEP tube amp. 10x10 room. Run at low volume. No sub support. Space taken up is important. Z height around 36" would be nice.

Ok, put 'em in a Karlson XK8.
Have you modeled a enclosure? Would stands be required?


opa1 18th September 2012 12:26 PM

On the 61 l, what is the driver and port placement? Any offset of driver?

GM 18th September 2012 03:40 PM

Hmm, the pioneers of audio concluded that the optimum reflex net Vb was whatever raised the driver’s Fs 1.56x in a sealed cab and for high output impedance amps it should be tuned to Fs for best overall LF efficiency.

Based on published specs this equates to a ~2.03 ft^3/57.63 L net Vb tuned to ~50 Hz, so ideally these should be changed based on measured specs and source output impedance.

Using MJK’s L*0.349 driver offset = 36”:

L = 54.15”
CSA = 64.78”^2 + driver, bracing
zdriver = 18.9”
zport = 43.32”
rport = 3”
Lport = 0.75”

All dims i.d. [inside] and approximate and of course damp to 'taste'.

GM

GM 18th September 2012 04:57 PM

Edit: ‘Pencil’ is a specific design routine, right? So we need a name for this particular MLTL design routine since any similarity to the Pencil is strictly coincidence AFAIK and could be quite ‘fat’ if the driver has a high Vas.

The ‘Pioneer’ series seems appropriate, but I’m ambivalent about such things, so any others?

GM

opa1 18th September 2012 07:56 PM

'Pioneer' That works.
When I said Pencil, I was refering to planet10's design for MA drivers. I like the use of the bottom and sides for the vent.

I'd like to make a monolithic design. 'Pioneer Monolithic'. Tall, wide, narrow.

Mark

GM 18th September 2012 11:39 PM

This small a net Vb for this driver in a tall cab causes too much HF ripple if the vent is located at the bottom, hence my positioning it at the bottom 5th of the cab.

Since the Pioneer’s alignment is fixed, its depth will be whatever 1.5x the driver’s protrusion into the cab is, then divide this into the effective CSA to get its internal width and if it’s not monolithic enough then you’ll have to decide on how big it can be and just call it 'Monolithic'.

GM


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