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see updated crossover about 10 posts down
For this project, the name for which has yet to be finalized (there are a couple candidates), the goal was to put together a speaker that would sound good, (especially compared to cheap floorstanders in big box retail stores), be easy to build even for those with limited woodworking skills and minimal tools, and with a price in the $100 range for parts & materials, not including finishing. I also wanted to put together a fairly well-documented build, since this was targeted at folks new to speaker building. For those of you looking for something smaller, i have a PC speaker / HT satellite in the works for about $25 per speaker.... stay tuned.
Some of these goals were satisfied better than others -- the documentation and cabinet drawings are still in progress, and the price bumped up a little over the ambitious target, but you're probably still less than $110 a pair including MDF, and probably a few more bucks (vinyl laminate and painted baffle) to be completely done.
Even though the drivers are buyouts, they're expected to be in stock for a while. The 12-ohm nominal woofer (which measures more like a nominal 8-10 ohm) makes this design safe for any amp. I used the Bravox 06BV02S in the prototype because i have about a dozen of them, but the 06VB03B is very similar, but sacrifices a few hz of F3 but uses a smaller box. For those that prefer the gray-cone bravox drivers' appearance, i haven't tested them, but they're probably a drop in replacement. (i'll test it for free if anyone sends one postage paid).
The tweeter is the Peerless India T25QX01, which has a custom faceplate meant to match up with the Bravox woofers. this means that both drivers are surface mounted, but have rounded frames to reduce diffraction, and a jigsaw is more than sufficient to cut the holes because you won't see any rough edges on either one. the port is a "press-fit" design with a slight lip that will also cover some slightly less than round holes.
The cabinet is about 1.45 ft^3, tuned to about 45 Hz. (8.5"w x 36"h x 12.5"d. if you use the bravox -03 woofer that's currently in stock, you can shave this to 10.25" deep.) Both model with F3's in the upper 30s, though the -02 woofer that's no longer available shows about 1dB higher below 100 Hz. The lower bass isn't overpowering, but gives a good full-range sound. Since the tweeter is crossed fairly close to its Fs, they're not going to play extremely loud without some increasing distortion, but i haven't noticed any issues at normal levels.
The in-room measured frequency response is pretty good, with a slight dip around 4,000 hz, and otherwise +/- 2dB. the distortion measurements at 90dB reference level were pretty good too. all of the measurements were done with ARTA at 96kHz, using a pioneer home theater receiver run in stereo mode for the amp, and ART tube MP pre-amp, and a dayton EMM-6 microphone.
Current pricing list for version 1 crossover:
(2) $10.25 - Bravox 06BV03B 12-ohm blue poly woofer
(2) $9.60 - Peerless India T25QX01 1" tweeter
Bravox 06BV02B
(2) $6.25 - .90 mH 20ga inductor ($7.25 for 18ga)
(2) $3.49 - .15 mH 20ga inductor
(2) $1.25 - 3 ohm dayton 10W resistor
(4) $1.00 - 4 ohm dayton 10W resistor
(2) $1.25 - 7 ohm dayton 10W resistor
(2) $1.25 - 12.5 ohm dayton 10W resistor
(4) $0.61 - 10ufF nonpolarized electrolytic cap
(2) $1.34 - 1.0 ufF nonpolarized poly cap
(4) $0.61 - 12ufF nonpolarized electrolytic cap
(2) $0.56 - 6.8ufF nonpolarized electrolytic cap
(2) $3.49 - binding post terminal cup
(2) $3.15 - 2.5" flared port tube
version 2 crossover is below, direct link here
all told, including port, posts, etc, these will run about $90 / pair in parts (maybe $94 if you add screws and some insulated terminals. if you buy everything for 2 sets and get the quantity discount for 4+, you can hit the $80/pair in parts threshold).
any feedback or constructive criticism appreciated.
For this project, the name for which has yet to be finalized (there are a couple candidates), the goal was to put together a speaker that would sound good, (especially compared to cheap floorstanders in big box retail stores), be easy to build even for those with limited woodworking skills and minimal tools, and with a price in the $100 range for parts & materials, not including finishing. I also wanted to put together a fairly well-documented build, since this was targeted at folks new to speaker building. For those of you looking for something smaller, i have a PC speaker / HT satellite in the works for about $25 per speaker.... stay tuned.
Some of these goals were satisfied better than others -- the documentation and cabinet drawings are still in progress, and the price bumped up a little over the ambitious target, but you're probably still less than $110 a pair including MDF, and probably a few more bucks (vinyl laminate and painted baffle) to be completely done.
Even though the drivers are buyouts, they're expected to be in stock for a while. The 12-ohm nominal woofer (which measures more like a nominal 8-10 ohm) makes this design safe for any amp. I used the Bravox 06BV02S in the prototype because i have about a dozen of them, but the 06VB03B is very similar, but sacrifices a few hz of F3 but uses a smaller box. For those that prefer the gray-cone bravox drivers' appearance, i haven't tested them, but they're probably a drop in replacement. (i'll test it for free if anyone sends one postage paid).
The tweeter is the Peerless India T25QX01, which has a custom faceplate meant to match up with the Bravox woofers. this means that both drivers are surface mounted, but have rounded frames to reduce diffraction, and a jigsaw is more than sufficient to cut the holes because you won't see any rough edges on either one. the port is a "press-fit" design with a slight lip that will also cover some slightly less than round holes.
The cabinet is about 1.45 ft^3, tuned to about 45 Hz. (8.5"w x 36"h x 12.5"d. if you use the bravox -03 woofer that's currently in stock, you can shave this to 10.25" deep.) Both model with F3's in the upper 30s, though the -02 woofer that's no longer available shows about 1dB higher below 100 Hz. The lower bass isn't overpowering, but gives a good full-range sound. Since the tweeter is crossed fairly close to its Fs, they're not going to play extremely loud without some increasing distortion, but i haven't noticed any issues at normal levels.
The in-room measured frequency response is pretty good, with a slight dip around 4,000 hz, and otherwise +/- 2dB. the distortion measurements at 90dB reference level were pretty good too. all of the measurements were done with ARTA at 96kHz, using a pioneer home theater receiver run in stereo mode for the amp, and ART tube MP pre-amp, and a dayton EMM-6 microphone.
Current pricing list for version 1 crossover:
(2) $10.25 - Bravox 06BV03B 12-ohm blue poly woofer
(2) $9.60 - Peerless India T25QX01 1" tweeter
Bravox 06BV02B
(2) $6.25 - .90 mH 20ga inductor ($7.25 for 18ga)
(2) $3.49 - .15 mH 20ga inductor
(2) $1.25 - 3 ohm dayton 10W resistor
(4) $1.00 - 4 ohm dayton 10W resistor
(2) $1.25 - 7 ohm dayton 10W resistor
(2) $1.25 - 12.5 ohm dayton 10W resistor
(4) $0.61 - 10ufF nonpolarized electrolytic cap
(2) $1.34 - 1.0 ufF nonpolarized poly cap
(4) $0.61 - 12ufF nonpolarized electrolytic cap
(2) $0.56 - 6.8ufF nonpolarized electrolytic cap
(2) $3.49 - binding post terminal cup
(2) $3.15 - 2.5" flared port tube
version 2 crossover is below, direct link here
all told, including port, posts, etc, these will run about $90 / pair in parts (maybe $94 if you add screws and some insulated terminals. if you buy everything for 2 sets and get the quantity discount for 4+, you can hit the $80/pair in parts threshold).
any feedback or constructive criticism appreciated.
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