I went to his place til implement the new amp, speakers and DSP in his system this weekend. He repainted the J-horn before installation. The result is quite allright!
I went to his place til implement the new amp, speakers and DSP in his system this weekend. He repainted the J-horn before installation. The result is quite allright!
Looks great. Are those subs open-baffle?
Hi PMA,
No better sounding result if you remove the top & bottom drivers in the array ? (not enough sensibility anymore or are you EQ the array ?)
No better sounding result if you remove the top & bottom drivers in the array ? (not enough sensibility anymore or are you EQ the array ?)
Edam,
The very nature of the "open baffle" (or di-pole) is that it is very inefficient at producing bass due to the front-to-back wavelength cancellation, therefor, as many drivers as possible are used to compensate for this aspect.
And YES, e.q. must also be applied to counter balance the bass loss.
Yep I know, but I asking myself despite - 2 drivers if the bass sound should be better if these two drivers were swaped from the closest front surface ; floor & ceilling ! (ok - 3 db due to the close surface and near 50% of less spl due to the total Sd is twice less...)
Experiment if you prefer (but yes at the price of more cone mvt due to less surface ! At least it'a bass array and there is room mode as well !
Just a question if this empiric test was ever made in PMA long experience ?
Experiment if you prefer (but yes at the price of more cone mvt due to less surface ! At least it'a bass array and there is room mode as well !
Just a question if this empiric test was ever made in PMA long experience ?
What would be the point of removing the top and bottom driver?
The need for EQ in the bass is very room-dependent. In one of the rooms where I have measured and voiced a similar bass OB, there is no EQ below 70Hz and they go as low as 30Hz with a very addictive kick...
The need for EQ in the bass is very room-dependent. In one of the rooms where I have measured and voiced a similar bass OB, there is no EQ below 70Hz and they go as low as 30Hz with a very addictive kick...
I don't see a sensible reason as you're not crossing them high enough to be a point source.
so we can putt this arrays in all position, oblic, vertical , horizontal what ever the height, on the sides walls, etc : with the same result because the wave lengths are longer than the room size ?
Would you be able to describe the subjective sound differences between the open baffle array, the SLOBs and a monopole configuration? Do you feel you ever miss the feeling of room loading that you get with a monopole? And have you considered going with tapped subwoofers?
The regular OBs sound extremely dry, punchy and without any audible lag. That is my main concern with regular, boxed or vented bass solutions.
The SLOBS are even more drier, go deeper and carry a first-tone punch that is very addictive.
The feeling of a slow "wave" of bass loading the room is gone, and is not missed IMO. When that is said, I do not miss bottom end or feeling of pressure in my room with 16pcs of 15" woofers.
Tapped subs are very good at the lowest frequencies. Me and a friend are planning 2pcs of 21" drivers in tapped horns per side, to go into his stereo.
The tapped horns I have heard, however, do not mach the SLOBS or OB's dry, airy and "in the room"-bass in the 50-120hz region.
After other projects have been finished I felt the need for a better temporary setup.
Step one:
Step one:
Step two:
Had some leftover parts from a test I did with 12" woofers in a closed box for midbass purposes earlier. Rebuilt into open baffles with a bit of a U-shape.
Had some leftover parts from a test I did with 12" woofers in a closed box for midbass purposes earlier. Rebuilt into open baffles with a bit of a U-shape.
Near as I can figure, PMA's room is quite a bit MORE sensitive to bass than a typical room.
I say "near as I can figure" because in most cases, open baffle bass simply can not compete with the ease and power of a monopole type woofer system.
PMA also speaks about "first note bass", or some such thing that I probably have not remembered correctly, but that is the kind of "half-note" sound I hear from any and all open baffle bass attempts that I have auditioned. To me, they are just not right; not even close, but oddly enough, that's the very same kind of sound that so many of the open baffle crowd seems to love. So, as usual, different strokes for different folks. At the end of the day, it's each system's owner who either enjoys his own sound, or does not. No one else's opinion matters at all.
That would be 4x 12 inch woofers on each channel. He had them arranged 3 vertical and side by side at the bottom, (if that makes sense ?) 3 in a line but the bottom woofer had a woofer next to it. The baffle was a very large triangle.
I think they were GRS woofers. The bass quality was quite poor indeed.
It did not take very long before that very same person gave up completely on the OB idea for bass, at least. He has since gone to a classic bass reflex with a single 10 inch on each side, and it's bass performance is really quite remarkable. It is a Leach design.
If you are enjoying your sound quality, then please, by all means continue to do so. But for me, an open baffle bass approach will never EVER suffice.
No, that is not the only open baffle bass that I have heard. I have also auditioned a couple of single 15's; each one a slightly different style from a different builder. Add to the list: 4 x 10 inch line arrays, 3 x8 inch in a quasi- full range attempt, and 6 per side 8 inch.
In all auditions, except the first one listed in my previous post, the system owner thought it was just wonderful. I respectfully disagreed. In all but one case we are still friends, simply coming to the understanding that we all hear things differently. In the one case, the system builder has cut off absolutely all ties of friendship and communication with me. It must be he is simply SO ANGRY that I did not find his attempt at bass reproduction to my liking.
And said person is a phD. Go figure.
p.s. Many of my associates in audio still maintain that I have not given "OB" a fair chance. So, my question is, just where do I listen to a good one ?
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