Thanks for the cutting dimensions. When I get home I will go onto sketchup and verify the dimensions. I'm away from home now. I also have a wood shop at my disposal (with a cnc machine) incase Home Depot/lowes gives me trouble. I also know people at home depot, so I could always make sure they are there when I go.
Front is 44 1/8 as drawn because it is flush with the sides? (don't know why I wrote 15 3/8 🙂)
The side panels (x2) are each 17 3/4" by 46 1/2". The front is 11" by 44 1/8". The back is 11" by 46 1/2". The top is 11" by 16 1/4". The bottom is 11" by 17". The port piece is 11" by 3 1/4". So Ron, your dimensions were correct minus the front baffle.
Do we have the following information on the Betsy-K:
Impedance of the voice coil (Lvc)
Width of the baffle in inches (Wb)
Impedance of the voice coil (Lvc)
Width of the baffle in inches (Wb)
You need 1lb per cubic foot of damping material in this enclosure.
You need to put damping in the top 2/3's of the enclosure.
Here is an option: Acousta-Stuf Polyfill 1 lb. Bag 260-317
11x16.25x45 = 8043.75 cubic inches
8043.75/1728 = 4.654947917 cubic feet
4.654947917 = 1.551649306 in thirds
1.551649306*2 = 3.103298612
So you need roughly 3lbs of damping material.
You need to put damping in the top 2/3's of the enclosure.
Here is an option: Acousta-Stuf Polyfill 1 lb. Bag 260-317
11x16.25x45 = 8043.75 cubic inches
8043.75/1728 = 4.654947917 cubic feet
4.654947917 = 1.551649306 in thirds
1.551649306*2 = 3.103298612
So you need roughly 3lbs of damping material.
I was referring to the TABAQ TL enclosure to get the 1 lb stuffing numbers.
The damping is high (1 lb per ft3) and is placed in the upper part of the pipe. The last third of the pipe is not stuffed. The stuffing will attenuate the output from the opening, so I solved this by increasing the volume of the cabinet.
Wrong source, sorry.
Hi
lvc is not known for Betsy K. I have asked the manufacturer but did not get any answer.
Hi from
Bjorn
lvc is not known for Betsy K. I have asked the manufacturer but did not get any answer.
Hi from
Bjorn
Paul posted this on another site:
Re 6.6 Ohm,
Fs 68.5 Hz,
Sd 211.2,
Md 10.5g
Bl 5.08,
Qms, 4.80,
Qes .770,
Qts .664,
Spl 95db
Vas 48.744L, Mms 7.02g
Re 6.6 Ohm,
Fs 68.5 Hz,
Sd 211.2,
Md 10.5g
Bl 5.08,
Qms, 4.80,
Qes .770,
Qts .664,
Spl 95db
Vas 48.744L, Mms 7.02g
I have tried to find the Lvc for the Betsy k the past, but I have not had any luck. Are you planning on building a zobel network Ron?
I was looking into it, keeping my options open for now...
What are you planning for your build Dumbledog?
BETSY-K
Re 5.7 ohms
Fs 49.959Hz
Sd 22.966
BL 5.471
Qms 2.798
Qes .548
Qts .458
Spl 94.6
Vas 82.914L
Mms 9.167g
Source: http://www.wildburroaudio.com/speakers.php
Re 5.7 ohms
Fs 49.959Hz
Sd 22.966
BL 5.471
Qms 2.798
Qes .548
Qts .458
Spl 94.6
Vas 82.914L
Mms 9.167g
Source: http://www.wildburroaudio.com/speakers.php
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Ron's specs seem better. I think the ones I quoted were a one off he had made called the Purple Speaker.
I was thinking of forgoing the zobel, since I can't really calculate the design without knowing the Lvc. I was planning on possibly including a baffle step correction circuit if needed, though with the front-firing ported design of the WIBAQ I'm hoping that will enforce the bass enough the baffle step correction won't be needed.