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Old 16th September 2012, 09:13 PM   #1
opa1 is offline opa1  United States
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Default 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

Last edited by opa1; 22nd October 2012 at 08:28 PM.
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Old 17th September 2012, 12:35 PM   #2
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Ok, put 'em in a Karlson XK8.


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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
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Old 17th September 2012, 01:13 PM   #3
nesha is offline nesha  Serbia
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Here is my experience with BesyK BetsyK ML-TL and TQWT
I think that she needs big box, whatever concept you choose it's going to end on the big side...
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Old 17th September 2012, 04:20 PM   #4
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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?
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Old 18th September 2012, 12:18 PM   #5
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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 View Post
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?
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Old 18th September 2012, 12:26 PM   #6
opa1 is offline opa1  United States
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On the 61 l, what is the driver and port placement? Any offset of driver?
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Old 18th September 2012, 03:40 PM   #7
GM is online now GM  United States
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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
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Old 18th September 2012, 04:57 PM   #8
GM is online now GM  United States
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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
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Old 18th September 2012, 07:56 PM   #9
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'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
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Old 18th September 2012, 11:39 PM   #10
GM is online now GM  United States
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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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