Hi,
I normally use winISD but my windows machine has died and I use mac so I'm out of luck.
I have two NHT 1-11-84 8" woofers coming to make a pair of 'bass bin' to put under a two way i just built a new cab for.
I'm looking for natural bass (not boomy) extending < 40hz (fs is in the low 30s). I'm guessing the current two way extends to about 60hz or so but I haven't measured.
I believe these are suited to BR but I would love to do a TL of some sort if the driver is suited and someone were willing to sim one for me.
I'd be very appreciative if someone can help me out here. if i can supply more info please let me know.
NHT 1-11-084-011 8" Woofer
Reve= 5.500 Ohm
Fo= 32.240 Hz
Sd= 21.739m M2
Krm= 1.060m Ohm
Erm= 0.899
Kxm=55.063m H
Exm= 0.521
Vas=63.487 Ltr
Cms= 946.082u M/N
Mmd= 23.916m Kg
Mms= 25.759g
BL= 8.919 TM
Qms= 1.935
Qes= 0.361
Qts= 0.304
No= 0.570%
SPLo= 89.579 dB
I normally use winISD but my windows machine has died and I use mac so I'm out of luck.
I have two NHT 1-11-84 8" woofers coming to make a pair of 'bass bin' to put under a two way i just built a new cab for.
I'm looking for natural bass (not boomy) extending < 40hz (fs is in the low 30s). I'm guessing the current two way extends to about 60hz or so but I haven't measured.
I believe these are suited to BR but I would love to do a TL of some sort if the driver is suited and someone were willing to sim one for me.
I'd be very appreciative if someone can help me out here. if i can supply more info please let me know.
NHT 1-11-084-011 8" Woofer
Reve= 5.500 Ohm
Fo= 32.240 Hz
Sd= 21.739m M2
Krm= 1.060m Ohm
Erm= 0.899
Kxm=55.063m H
Exm= 0.521
Vas=63.487 Ltr
Cms= 946.082u M/N
Mmd= 23.916m Kg
Mms= 25.759g
BL= 8.919 TM
Qms= 1.935
Qes= 0.361
Qts= 0.304
No= 0.570%
SPLo= 89.579 dB
winISD says 25 liters tuned to 43Hz (a 2 inch diameter by 3.7 inch long vent) yielding an f3 of 47KHz is optimal. Not exactly room shaking bass...
Thanks!
I want to cover the range of a string bass. as it is now things become abruptly attenuated in something like a bass solo. I imagine there will be some room gain.
What was the roll off like below f3? Does it tank or go gentle for while.
NHT used these in some of their three way towers but I don't know the specs.
Whatever the case, I like playing around to see what happens. Got to get a windows machine working again.
I want to cover the range of a string bass. as it is now things become abruptly attenuated in something like a bass solo. I imagine there will be some room gain.
What was the roll off like below f3? Does it tank or go gentle for while.
NHT used these in some of their three way towers but I don't know the specs.
Whatever the case, I like playing around to see what happens. Got to get a windows machine working again.
Classic BR roll off (-18db/octave) according to the sim. But in room - who knows? Room gain will probably be your friend. As would having the driver close to the floor.
IMHO low bass is hard to sim as the room and driver position has so much influence. Build a test box using cheapo OSB and find out for yourself what it sounds like. While you're at it stuff the vent, open up the back of the box and add some "wings" made of cardboard to widen up the front baffle. You might be amazed at what open baffle bass sounds like...
IMHO low bass is hard to sim as the room and driver position has so much influence. Build a test box using cheapo OSB and find out for yourself what it sounds like. While you're at it stuff the vent, open up the back of the box and add some "wings" made of cardboard to widen up the front baffle. You might be amazed at what open baffle bass sounds like...
I'm not sure what Im going to do regarding xo point and slope. I want to put these things in a box and poke at them first. This is all an exercise. See what i can learn from this.
Really im not expecting the last word in high fidelity here. The drivers were cheap and my time is limited. Any bass extension will be awesome. These are needed at least as much as stands as for bass extension.
Width ~ 10" but I can always bevel the front baffle to a wider cabinet. The mid/tweeter cabinet is 8 1/4 and i don't like the looks of a giant cab under a smaller one.
Depth - any
height - 20 - 22
Due to an annoying tinnitus issue i cant really sit for extended listening so i'm rarely listening on axis. Height isn't chiseled in stone.
Really im not expecting the last word in high fidelity here. The drivers were cheap and my time is limited. Any bass extension will be awesome. These are needed at least as much as stands as for bass extension.
Width ~ 10" but I can always bevel the front baffle to a wider cabinet. The mid/tweeter cabinet is 8 1/4 and i don't like the looks of a giant cab under a smaller one.
Depth - any
height - 20 - 22
Due to an annoying tinnitus issue i cant really sit for extended listening so i'm rarely listening on axis. Height isn't chiseled in stone.
Hi,
1 cuft / 28L tuned to 35Hz will be drier in the bass
with a slower roll off that could work with room gain.
35L with 30Hz tuning will give you -6dB at
35Hz and -10dB at 27Hz, but -3dB is 60Hz
Not a driver to attempt open baffle with IMO.
rgds, sreten.
For a room gain alignment to work the driver must
be well clear of the rear and sidewalls at least and
differently spaced to them. Not a lot of choice
with the driver height to the floor usually.
1 cuft / 28L tuned to 35Hz will be drier in the bass
with a slower roll off that could work with room gain.
35L with 30Hz tuning will give you -6dB at
35Hz and -10dB at 27Hz, but -3dB is 60Hz
Not a driver to attempt open baffle with IMO.
rgds, sreten.
For a room gain alignment to work the driver must
be well clear of the rear and sidewalls at least and
differently spaced to them. Not a lot of choice
with the driver height to the floor usually.
Last edited:
looks interesting.
Do you have port lengths for any of these? i prefer slots. Whats the f3 on the 28l 35hz?
What do you mean differently spaced to the rear and side walls? Asymetrically placed in the room I assume. I didn't know this. I assume it has something to do with distributing cancellations across the frequency range.
Do you have port lengths for any of these? i prefer slots. Whats the f3 on the 28l 35hz?
What do you mean differently spaced to the rear and side walls? Asymetrically placed in the room I assume. I didn't know this. I assume it has something to do with distributing cancellations across the frequency range.
Hi,
f3 is 50Hz but the shape above and below f3 is different to 25L/43Hz.
For 2" vent diameter 28L/35Hz 5.4" and 35L/30Hz 6", (WinISDbeta).
rgds, sreten.
f3 is 50Hz but the shape above and below f3 is different to 25L/43Hz.
For 2" vent diameter 28L/35Hz 5.4" and 35L/30Hz 6", (WinISDbeta).
rgds, sreten.
Last edited:
ok. thanks. lots of good info. since i need more height than the volume requires it might be interesting to put a moveable floor in the cab and some varying pvc pipe ports and experiment a little.
i can visualize what these configurations would look like in winISDs chart but i dont really know what they are going to sound like.
Will report back assuming this doesn't stretch out for months like the monitor cab did.
i can visualize what these configurations would look like in winISDs chart but i dont really know what they are going to sound like.
Will report back assuming this doesn't stretch out for months like the monitor cab did.
OK, a single inverted ‘U’ fold Vb = Vas, Fb =Fs MLTL is doable. Assuming 0.75” material thickness, this will be 22” H x 10” W x 24.5” D:
L = 41”
WxD = 8.5” x 11.125”
Zdriver = 14.31”
Zport = 38”
Dport = 3”
Lport = 4”
It’s large enough to allow some tuning flexibility, including increasing its height, which I prefer:
L = 60”
WxD = 8.5” x 11.125”
Zdriver = 21”
Zport = 57”
Dport = 4”
Lport = 3.5”
All dims i.d. and approximate. Simmed stuffing density is 0.25 lbs/ft^3 of polyfil.
GM
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