Juli 2023 Refresh of SBA_SLOB_GUY OB PROJECT in the not too big Home Office room, pics says more than long explanations
The waveguide for the 8 inch is used here only like a filler driver between the side mounted 2 X 15 inch kick bass and and the midrange horn with the compression driver - it's a kind of waste but the final setup will be moved to the big room under the roof top later. The cabling is in complete prototype state, this has to be done much better for the final installation.
The waveguide for the 8 inch is used here only like a filler driver between the side mounted 2 X 15 inch kick bass and and the midrange horn with the compression driver - it's a kind of waste but the final setup will be moved to the big room under the roof top later. The cabling is in complete prototype state, this has to be done much better for the final installation.
Hey @perrymarshall, I am considering using the W15 driver instead of the SB Audience in my build (because I have two of them). The xmax is a bit higher at 15mm (good for EQ), qts is a bit higher at .79, fs is 27.6, and sensitivity is about the same. Whats your reaction as to how this driver might fit into a the design?
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Sensitivity for W15 is actually a good bit lower - 4 ohms and 95dB vs. SB being 8 ohms and 98 dB, so you'll have to compensate for that in your DSP EQ.
Running two of those in parallel would also present a ~2ohm load for your amp. If you wire the coils in series then you've got an 8 ohm system and lose a proportional amount of sensitivity which again you have to compensate for with EQ.
Running two of those in parallel would also present a ~2ohm load for your amp. If you wire the coils in series then you've got an 8 ohm system and lose a proportional amount of sensitivity which again you have to compensate for with EQ.
Hi Gents,
Wondering if anyone has auditioned both Supravox 215 RTF & Ems LB8. Originlly was thinking of
FC for wide band mids but feel that it's too much of a hassle hence decided to go with permanant
magnets instead. Would love to hear your thoughts on sound before I decide on which way to go.
Basically the OB that I'll build will include a Coral 3BX super tweeter with acoustic lens.
Thanks
Wondering if anyone has auditioned both Supravox 215 RTF & Ems LB8. Originlly was thinking of
FC for wide band mids but feel that it's too much of a hassle hence decided to go with permanant
magnets instead. Would love to hear your thoughts on sound before I decide on which way to go.
Basically the OB that I'll build will include a Coral 3BX super tweeter with acoustic lens.
Thanks
Stunning in musical sense probably.
Visually very demanding, don't want these in my listening room.
Surely they'll do fine in Elisabeth Murdoch Hall.
https://www.melbournerecital.com.au/venues/emh/
Visually very demanding, don't want these in my listening room.
Surely they'll do fine in Elisabeth Murdoch Hall.
https://www.melbournerecital.com.au/venues/emh/
Magnepan 3.7 / 3.6
Some info in these threads :
Thread 'Magnepan - convert to active crossovers'
https://www.diyaudio.com/community/threads/magnepan-convert-to-active-crossovers.392837/
Thread 'Double Bass Array'
https://www.diyaudio.com/community/threads/double-bass-array.401001/
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Hi Zmyrna,
No, I don´t think so, and even believe there´ll never be, as vibration generally is indeed an issue. Especially with an OB. Even more so if you make simple OBs - nail your 18" bass driver (with 200gr or so of moving mass) to an old barn door and let the thing shake and dance...
Your worries are justified.
All the best
Mattes
No, I don´t think so, and even believe there´ll never be, as vibration generally is indeed an issue. Especially with an OB. Even more so if you make simple OBs - nail your 18" bass driver (with 200gr or so of moving mass) to an old barn door and let the thing shake and dance...
Your worries are justified.
All the best
Mattes
I use braced 3/4" MDF and resonance is not audible to my ears at low to moderate levels. If I listened at head banging levels which I don't, I'm sure I'd get audible resonance.
I used a double layer of 19 mm MDF with steel rails for increased stiffness, and some bitumen sheets for a little dampening. It turned out very good, with no audible resonances, and very little vibration can be felt on the baffles themselves.
As mentioned before, the finished speaker weighs about 75 kg. The moving mass of the four Eminence Delta 12B woofers I used is just 128 grams. The 1/125 rule is satisfied
(1/586)
I think some of the trick is to select drivers with low Mms. I do remember trying the opposite, with a Beyma 21" that had 370 grams moving mass. That did not work so well in a small and light baffle.
As mentioned before, the finished speaker weighs about 75 kg. The moving mass of the four Eminence Delta 12B woofers I used is just 128 grams. The 1/125 rule is satisfied
(1/586)I think some of the trick is to select drivers with low Mms. I do remember trying the opposite, with a Beyma 21" that had 370 grams moving mass. That did not work so well in a small and light baffle.