Have many projects in my hand, and I haven't even thought about doing a full scale OB, but today I was browsing PE buying some items I needed, when I cam across some buyout 15" woofers that caught my attention. So cheap that I decided to buy the woofer and drivers necessary for a cheap 3-Way OB. These are the components:
2 ea. - Titan 15" Paper Woofer 4 Ohms (1 ea. per speaker)
2 ea. - 6.5" Poly Mid-Woofer 4 Ohms
(1 ea. per speaker)
1 pr. - Pyle Bullet Horn Tweeter 4 Ohms (1 ea. per speaker)
US$27.95 per speaker, plus crossover price (still figuring that) and wood, and I should be able to make them for less US$80.00 each. And, I most probably have some of the crossover components lying around somewhere.
2 ea. - Titan 15" Paper Woofer 4 Ohms (1 ea. per speaker)
2 ea. - 6.5" Poly Mid-Woofer 4 Ohms
(1 ea. per speaker)
1 pr. - Pyle Bullet Horn Tweeter 4 Ohms (1 ea. per speaker)
US$27.95 per speaker, plus crossover price (still figuring that) and wood, and I should be able to make them for less US$80.00 each. And, I most probably have some of the crossover components lying around somewhere.
About the crossover : the most redundant parts will be resistors, as you'll have to cut 5 dB from the midrange and 10 dB from the tweeter, being the woofer 85.8 dB sensitive, 88 the mid and 93 the tw.
Yes, I have to double check, but I believe that I have 4 or 6 adjustable L-Pads somewhere in a box of used parts. From 85.8 dB to 88 dB, it is only 2.2 dB difference which is not significant, and within 3 dB; I might not need attenuation for the mid. If I build passive L-Pad, it is very inexpensive, might add $2.00 or less.
It is not 2-3 dB difference because of the EQ required ( and asked for, being it a dipole and suffering from bass cancellation ). But first build then listen 😉
The devil of OB's and dipoles is in crossovers. But if the baffle is wide, only bass needs dipole-eq. But the eq of the bass unit drops it's efficiency a lot!
Yes, recently started to use my measuring mic, in the past I would just setup the active XO, listened, and when it sounded the best to me I would build the passive XO based on those parameters. So, I will probably build an XO based on mic measurements, also getting a MiniDSP to play with. My preference is always passive for convenience reasons. Appreciate your input.
Yes, in this case the baffle won't be much wider than the 15" woofer, so I will most probably add Bass Drop Compensation Circuit. As you said the devil is the XO, also the art and the science. I will probably end up spending more on the XO's than in everything else.
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