Well, if a full-length 165K box is desired:
Line: 169.5in
Zdriver: 34in
Sl=88.125in^2
IMO, this is pushing the drivers a bit hard though. Having said that, the simulations do appear to over-estimate excursion compared to real-life, so YMMV. Frankly, I think the 138in long cabinet does a good job, but for the insane...
The 166 should be a good alternative, preferably with Dave's phase plugs to smooth things out. Best of the lot along with the 165 IMO is the 168ESigma. Much pricier though.
Line: 169.5in
Zdriver: 34in
Sl=88.125in^2
IMO, this is pushing the drivers a bit hard though. Having said that, the simulations do appear to over-estimate excursion compared to real-life, so YMMV. Frankly, I think the 138in long cabinet does a good job, but for the insane...
The 166 should be a good alternative, preferably with Dave's phase plugs to smooth things out. Best of the lot along with the 165 IMO is the 168ESigma. Much pricier though.
Attachments
Scott,
If time permits can you sim a 124” Line with an SI of 72” just to see how my BIBs measure up?
If time permits can you sim a 124” Line with an SI of 72” just to see how my BIBs measure up?
Thank you Scott!
Nothing seems terribly wrong.
Much appreciated!
Now back to my latest adventure - acoustic room treatments! I can't wait to see how that turns out. At least i will end up with a decorated room in the end. I hope it 'sounds' better when i'm done.
Thanks!
Nothing seems terribly wrong.
Much appreciated!
Now back to my latest adventure - acoustic room treatments! I can't wait to see how that turns out. At least i will end up with a decorated room in the end. I hope it 'sounds' better when i'm done.
Thanks!
Godzilla said:
Greets!
Bound to work over some BW, but with no reflection/absorption specs here or on the Armstrong site that I could find, your guess is as good as mine.
Anyway, FR drivers are already beaming in the BW where early reflections cause the most grief, so over-toeing them with the left channel lined up with the far right seat and vice versa usually is sufficient.
GM
I read somewhere ( yeah I know...dodgy) that you can 'tame' certain frequencies in a room by placeing sound absorbing stuff at specific intervals, where they reflect off the wall/floor/etc. to the listening position.
If you've got reaallly good ears and/or a mic that measures the bumps and dips at the listening chair and you are good at math you could put 'stuff' at measured distances as a starting point. At least thats what they do in theatres to prevent booming...I think....
Stroop
If you've got reaallly good ears and/or a mic that measures the bumps and dips at the listening chair and you are good at math you could put 'stuff' at measured distances as a starting point. At least thats what they do in theatres to prevent booming...I think....
Stroop
Scottmoose said:
Greets!
Well, I was referring to 'blonds', as in blond colored wood, etc., rather than the 'blonde' haired folks of which I was once one, and while I've enjoyed a disproportionate number of them in my time, it's the green or gray eyed, red or auburn headed 'foxes' that really makes my blood boil.
GM
FE103 Bibs anyone?
Does anyone have listening experience to report with FE103 Bibs built per the dimensions on Godzilla's site?
I have a pair that need to be put to work.
Thanks much
Ryan
Does anyone have listening experience to report with FE103 Bibs built per the dimensions on Godzilla's site?
I have a pair that need to be put to work.
Thanks much
Ryan
Someone named Bruce built them and seemed to like them.
There is a link to his project but i don't have it bookmarked. Perhaps someone does.
Godzilla
There is a link to his project but i don't have it bookmarked. Perhaps someone does.
Godzilla
Hemp drivers & low Q
You are right - I am confused. There is A Brown Soun, Tone Tubby and Hemptone/cone which all seem related. And Hemp Accoustics whose FR8 driver looks VERY similar to the Hemptone 8". And when you talk about the new TT drivers I assume this is something different to the Hemptone 8" full range. If somebody could explain the relationship between all these I would be very greatful!!
On the low Q - I also associate this with a "fast" driver, that is one with clean response and no overhang (hope these are the appropriate terms here) and also something that goes hand in hand with full range response. Am I wrong here?
Cheers,
Chris
Scottmoose said:
You are right - I am confused. There is A Brown Soun, Tone Tubby and Hemptone/cone which all seem related. And Hemp Accoustics whose FR8 driver looks VERY similar to the Hemptone 8". And when you talk about the new TT drivers I assume this is something different to the Hemptone 8" full range. If somebody could explain the relationship between all these I would be very greatful!!
On the low Q - I also associate this with a "fast" driver, that is one with clean response and no overhang (hope these are the appropriate terms here) and also something that goes hand in hand with full range response. Am I wrong here?
Cheers,
Chris
Scottmoose said:
Greets!
When I was helping Freddy with AJhorn recently I noticed that it predicts much better BIB damping than MJK's WSs and more in line with what I remember just watching woofers that were easily damaged on over-excursion. That said, for most of these drivers ~1 W is the upper limit down low IMO and why I recommend such big cabs for a little added protection.
GM
stroop said:
Greets!
You can if it's a simple square or rectangular room, but after that the math gets a bit intense and why RTAs, etc., were developed.
Hmm, theater, etc., acoustics are designed in from the ground up, so the damping is for fine tuning its reverberant field AFAIK.
GM
GM said:
With the set currently in my living room, if the needles are around 1 watt, maybe bouncing to the 5-10 watt area, those cabinets are screaming, but clear and defined. Oddly though, the BIB seems cable of handling a larger wattage, bigger sound of coures, then any of the other sets i have built.
Off the topic, Scott, you may have missed it, but have you heard Martin Grech? He is from around your neck of the world. I believe London.
Not a name I'm familar with AFAIK... (?)
Big cab -good idea for the low excursion units. Worth keeping in mind, that.
Chris -see my other post re some hemp information. Basically, Tone Tubby are the real deal WRT genuine hemp cones. Hemp Acoustics lost those via sharp practice, so I gather, and assorted other things.
You're mostly right re low Q -basically, the lower it is, the more powerful the motor (more to it than that, but you get the idea). An FR unit doesn't necessarily have to be low Q though -there are plenty of high Q classic WR / FR drivers, and the Visaton B200, with a Qt of 0.72 is probably the most famous of the current higher Q drivers.
Big cab -good idea for the low excursion units. Worth keeping in mind, that.
Chris -see my other post re some hemp information. Basically, Tone Tubby are the real deal WRT genuine hemp cones. Hemp Acoustics lost those via sharp practice, so I gather, and assorted other things.
You're mostly right re low Q -basically, the lower it is, the more powerful the motor (more to it than that, but you get the idea). An FR unit doesn't necessarily have to be low Q though -there are plenty of high Q classic WR / FR drivers, and the Visaton B200, with a Qt of 0.72 is probably the most famous of the current higher Q drivers.
Re: Hemp drivers & low Q
Greets!
Yes in that the harmonics are higher in amplitude to the fundamentals, which is technically harmonic distortion. Remember that any driver with a Qts <0.5 is increasingly over-damped with decreasing Qts (can't reach the transient peak) and >0.5 is increasingly under-damped with increasing Qts (overshoots/'rings'), so this affects the cab alignment and how it interacts with the room to balance it all out. The other definition of a 'fast' driver is where it has a rising response in its mass controlled BW due to excessive break-up modes and/or has a whizzer, which again is harmonic distortion, euphonic though it may be to some since we are amplitude oriented creatures.
GM
ChrisMmm said:
Greets!
Yes in that the harmonics are higher in amplitude to the fundamentals, which is technically harmonic distortion. Remember that any driver with a Qts <0.5 is increasingly over-damped with decreasing Qts (can't reach the transient peak) and >0.5 is increasingly under-damped with increasing Qts (overshoots/'rings'), so this affects the cab alignment and how it interacts with the room to balance it all out. The other definition of a 'fast' driver is where it has a rising response in its mass controlled BW due to excessive break-up modes and/or has a whizzer, which again is harmonic distortion, euphonic though it may be to some since we are amplitude oriented creatures.
GM
Scottmoose said:
Thanks Scott, I had missed the piece in your earlier post about hemps. Looking forward to the forthcoming TT drivers.
Chris
That's it exactly GM! I knew you'd know the why's and whatsits!
P.S. I know you know this...but you'd be amazed the amount of theatres that get it rather wrong!
Stroop
P.S. I know you know this...but you'd be amazed the amount of theatres that get it rather wrong!
Stroop
Hey Scott,
Which of the tone tubby's has the good highs? Do they all need a tweeter? No charts as you know. Darn it I know I've seen something somewhere!! But...just...can't....remember. Argh.
Stroop
Which of the tone tubby's has the good highs? Do they all need a tweeter? No charts as you know. Darn it I know I've seen something somewhere!! But...just...can't....remember. Argh.
Stroop
