There seems to be a lot of assumptions going on here. The resonance of the slot is of course a function of the drivers size etc...
However, with the 15" drivers used here, the resonance appears at approx 270 hz, and is not at all a problem at 130hz with a steep active XO. The larger the driver, the lower the resonance. A friend of mine just built ripoles with 21", and even there the resonance is not as prominent as I would have guessed (but of course at a lower point than in my slobs)
However, with the 15" drivers used here, the resonance appears at approx 270 hz, and is not at all a problem at 130hz with a steep active XO. The larger the driver, the lower the resonance. A friend of mine just built ripoles with 21", and even there the resonance is not as prominent as I would have guessed (but of course at a lower point than in my slobs)
Regular OB from midbass up to 650 has been tested, but falls short of the SLOB and midhorn response by a far strech. The latter also requires less EQ and is an overall smoother response.
The SLOBS as a mono sub is a bad idea, it is perceived to be far more directional even at low frequencies.
I truly appreciate the proposals, but the system is pretty much tried and tested with all different kind of configurations. The SLOB is better than regular OB from 130-150 and down, and the midhorn better than regular OB from 130 and upward.
I sad perceived to be more directional. The physical feeling of dynamic slam and punch in the bass region is very directional with this bass system. Of course there is also bass elsewhere in the room, but the impact of the sound is very concentrated. That is also why the SLOBs are angled to play directly towards the listening position.
Move two feet to the left or right, and the punch is pretty much gone....
Move two feet to the left or right, and the punch is pretty much gone....
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i never got that directional bass in U or H frame OB...the deep bass has always stayed very diffuse.... it sometimes makes you think that the bass is coming from the sofa underneath 🙂
but i shall take your word for SLOB...
what is the difference then between single SLOB sub in the middle and two SLOBs left and right? do you get a stereo bass effect or is it more like single drum kit in the middle vs. two drum kits left and right? If it is the later, is it really an improvement?
but i shall take your word for SLOB...
what is the difference then between single SLOB sub in the middle and two SLOBs left and right? do you get a stereo bass effect or is it more like single drum kit in the middle vs. two drum kits left and right? If it is the later, is it really an improvement?
I hear diffuse low end from OB's when they are under dimensioned and/or used with high q, long excursion woofers.
I have tried a middle slob only very shortly, and mostly for measuring/prototyping.
However, the bass is very much indeed a stereo thing. A symmetrical "loading" of the room is key to good bass reproduction and the perceived stereo image imo, so I would never recommend a mono sub as an optimal solution.
And yes, its a huge improvement.
I have tried a middle slob only very shortly, and mostly for measuring/prototyping.
However, the bass is very much indeed a stereo thing. A symmetrical "loading" of the room is key to good bass reproduction and the perceived stereo image imo, so I would never recommend a mono sub as an optimal solution.
And yes, its a huge improvement.
FWIW, the stereo vs mono sub debate has raged in several threads here over the years.
Both sides seem intractable. I am firmly in the stereo sub camp, but have found (by testing) that many people just don't hear the direction of bass very well. I don't know why the individual differences exist.
Just to put it into perspective why there may be different opinions and experiences with bass. Back to the thread!
Both sides seem intractable. I am firmly in the stereo sub camp, but have found (by testing) that many people just don't hear the direction of bass very well. I don't know why the individual differences exist.
Just to put it into perspective why there may be different opinions and experiences with bass. Back to the thread!
I'm not sure it's that.
Woofers in the corners have a lateral mode cancellation where room width is 1/4 wl. In the middle of the room it's at room width = 1/2 wl, but at the quarter width positions half the horizontal radiation goes to the first mode and the other half partly fills it back in.
I like the result of woofers not far from the quarter width points and it allows me to put mids on the floor in the corners. Crossed at or below the Schroeder frequency, drums image for me where the mids put them, without pulling toward the woofers.
Woofers in the corners have a lateral mode cancellation where room width is 1/4 wl. In the middle of the room it's at room width = 1/2 wl, but at the quarter width positions half the horizontal radiation goes to the first mode and the other half partly fills it back in.
I like the result of woofers not far from the quarter width points and it allows me to put mids on the floor in the corners. Crossed at or below the Schroeder frequency, drums image for me where the mids put them, without pulling toward the woofers.
Pano,
I do not think there is much debate against multiple omni subs; the more the better it seems.
But I had the impression that single dipole/ripole sub would be okay under 60-80hz.
I do not think there is much debate against multiple omni subs; the more the better it seems.
But I had the impression that single dipole/ripole sub would be okay under 60-80hz.
An externally hosted image should be here but it was not working when we last tested it.
New plans emerging....
This will replace the j-horn I guess. I am waiting to hear about the differences. These will have the altecs in them?
My project is going good too. I decided on sealed bass arrays with 4x12" ScanSpeak 30w/4558t00 each from 38hz up to 160hz, then cross to cf110 round tractrix. I am planning on powering them up with four hypex nc400 modules with two smps1200a400.
So the tapped horn I had will be covering from 20hz to 38hz and wont be operating in regions that it lacked good performance.
My project is going good too. I decided on sealed bass arrays with 4x12" ScanSpeak 30w/4558t00 each from 38hz up to 160hz, then cross to cf110 round tractrix. I am planning on powering them up with four hypex nc400 modules with two smps1200a400.
So the tapped horn I had will be covering from 20hz to 38hz and wont be operating in regions that it lacked good performance.
Yes, replacement for the J-horn. They will not have altecs, these are made for 12" drivers, and I need something more "tight" then altecs for powering a horn with higher compression. Been looking at some neodymium drivers from Precision Devices.
Those 12" will need to be very efficient as well. You can check what I am using for the similar frequency range. The supravox 285-2000. It is around 11". Model it and see if it works for you. This driver sounds really good (at least thats what I think)
Perhaps B&C 12pe32 for a 12" candidate? Looks like it would work for a front horn
B&C Speakers
Cheers
FM
B&C Speakers
Cheers
FM
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