Greetings
I've yet again revised my DIY sub project plans. Seems I've traded my SAF problem for a neighbors in the apartment complex problem...sigh. So it looks like I'll be scaling back a bit. My current criteria are high musicality , serious low end, reasonable cost and modest needs in the SPL department.
Here's my latest design idea.
Two Tang Band 8 inch W8-740C drivers in a push-pull configuration
Fs 28
Vas 23 L
Qts .30
Qms 10.53
Qes .30
X Max 12mm
Single voice coil
Z 4
re 3.2
BL 13.35
pe 230
1w1m 84
price $32
Vented box about 1.5 ft^3, tuned to 23Hz
150w - 250w plate amp
My initial simulations show a nice EBS type curve down into the low twenties that should serve well as I'll be using large towers as my mains and crossing over around 60Hz.
I've a few concerns including : 1. Quality of Tang Band woofers (seem to be known for their excellent inexpensive small full-range speakers) - 2. paper cone and foam surround - 3. fitting a vent that long in a small box.
I've very little audio background and haven't built any speakers in 15 years, so any feedback on these or other issues with this design highly appreciated.
thanks!
I've yet again revised my DIY sub project plans. Seems I've traded my SAF problem for a neighbors in the apartment complex problem...sigh. So it looks like I'll be scaling back a bit. My current criteria are high musicality , serious low end, reasonable cost and modest needs in the SPL department.
Here's my latest design idea.
Two Tang Band 8 inch W8-740C drivers in a push-pull configuration
Fs 28
Vas 23 L
Qts .30
Qms 10.53
Qes .30
X Max 12mm
Single voice coil
Z 4
re 3.2
BL 13.35
pe 230
1w1m 84
price $32
Vented box about 1.5 ft^3, tuned to 23Hz
150w - 250w plate amp
My initial simulations show a nice EBS type curve down into the low twenties that should serve well as I'll be using large towers as my mains and crossing over around 60Hz.
I've a few concerns including : 1. Quality of Tang Band woofers (seem to be known for their excellent inexpensive small full-range speakers) - 2. paper cone and foam surround - 3. fitting a vent that long in a small box.
I've very little audio background and haven't built any speakers in 15 years, so any feedback on these or other issues with this design highly appreciated.
thanks!
tuned to 23hz the port will be long with a small box
how long exactly?
84db/1watt is abit low
lots of speaker are paper cone and foam,i dont know about tang band though..
personaly im buying a pro 15inch to get efficient 34hz..
push pull reduces 2nd harmonics i think..and reduces box size,i forget exactly.
www.linearteam.org
how long exactly?
84db/1watt is abit low
lots of speaker are paper cone and foam,i dont know about tang band though..
personaly im buying a pro 15inch to get efficient 34hz..
push pull reduces 2nd harmonics i think..and reduces box size,i forget exactly.
www.linearteam.org
Looks like the vent works out to nearly 21 inches , then add an inch for double flared ends. I have considered a slot port where one side of the box becomes the inside wall of the vent - something like a transmission line. I think however a flared PVC tube would have less chance of chuffing, and would take up a bit less volume due the thickness of MDF board.
Push-pull config requires double the volume, normally has twice the efficiently, and there's some debate on which type of distortion it reduces (i.e. 1st or 2nt). I am planning to mount the drivers on opposite sides of the box, one firing in, one out. When the polarity's reversed on one they'll be mechanically in sync but electrically 90 degrees out of phase.
I'll probably have to wire them in parallel and end up with 8 ohms, unless I could find a cheap amp that handles a 2 ohm load. I don't know what the net efficiency will be???
thanks
<peter>
Push-pull config requires double the volume, normally has twice the efficiently, and there's some debate on which type of distortion it reduces (i.e. 1st or 2nt). I am planning to mount the drivers on opposite sides of the box, one firing in, one out. When the polarity's reversed on one they'll be mechanically in sync but electrically 90 degrees out of phase.
I'll probably have to wire them in parallel and end up with 8 ohms, unless I could find a cheap amp that handles a 2 ohm load. I don't know what the net efficiency will be???
thanks
<peter>
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