I'm trying to make computer speakers can I put 2 drivers in one box?
I was thinking of putting them anywhere between 30 degrees and 90 degrees with respect to one another.
I can't find off-axis response of my tang bangs or even the exact model for that matter. I'm assuming most 3 inch drivers have similar off axis response.
Looks like it's a good idea, if two per speaker is a good idea for near-field listening, that the drivers should not be in the same plane and should be at least 30 degrees askew.
Any thoughts?
My drivers look like this, but are shielded: http://www.axiomedia.it/TB-Speakers/PDF/W3-881SJF.pdf
Here is Peerless 830986 off-axis response I'm going by: http://www.europe-audio.com/datasheets/peerless/830986.pdf
I was thinking of putting them anywhere between 30 degrees and 90 degrees with respect to one another.
I can't find off-axis response of my tang bangs or even the exact model for that matter. I'm assuming most 3 inch drivers have similar off axis response.
Looks like it's a good idea, if two per speaker is a good idea for near-field listening, that the drivers should not be in the same plane and should be at least 30 degrees askew.
Any thoughts?
My drivers look like this, but are shielded: http://www.axiomedia.it/TB-Speakers/PDF/W3-881SJF.pdf
Here is Peerless 830986 off-axis response I'm going by: http://www.europe-audio.com/datasheets/peerless/830986.pdf
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If you are nearfield a single driver per side should be loud enough. 3 in drivers have excellent polar response because they are small and adding a second will cause comb interference - spatial non uniformities when you move your head around. It will make the polar response worse with lobing. If you want to do two drivers near field angle them at least 45 deg apart horizontally get a wide soundstage. Look in the Master Nagaoka matrixed speaker thread. Two drivers vertically aligned sound good farther away but not near field unless you run them as 1.5way (low pass one of them so that it essentially acts as a woofer below interference freq cutoff - depends on spacing of drivers but about 700 Hz).
For nearfield you could place the second driver on the back (bipolar) IF you can pull them a bit out from the wall. You will mostly avoid nearfield compfiltering and get nice bass and enveloping spacious sound without the directivity of FR drivers or need for BSC filter.
You can block some of the higher frequencies from the front driver with foam or felt to balance out the response between the two drivers.
You can block some of the higher frequencies from the front driver with foam or felt to balance out the response between the two drivers.
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lol, it depends........................
I preferred 2x4" (parallel run wide open) over using 1 as baffle step (or blocked with 1-4" of foam).
Less distortion, but less vertical dispersion too............
How near are you calling nearfield ?
I'd try a single driver first.
If you want more output or if it sounds strained, try dual driver (baffle step or run wide open).
I preferred 2x4" (parallel run wide open) over using 1 as baffle step (or blocked with 1-4" of foam).
Less distortion, but less vertical dispersion too............
How near are you calling nearfield ?
I'd try a single driver first.
If you want more output or if it sounds strained, try dual driver (baffle step or run wide open).
So even with the woofers at an angle of 40-45 degrees with respect to one another, the design is not a good idea? Is it a good idea with the BSC cutoff at around 700 Hz?
I had this idea also, but wasn't sure if I would like the sound.
Why do I need to block the high frequencies from the front driver?
I think it can work at 30 to 45 deg but be prepared for some lobing in horiz plane in the polar response. For two closely aligned vertical drivers or horizontal drivers if you low pass one if then at 700 Hz this should minimize the comb filtering/lobing. This is different than BSC where you are attenuating the highs above the baffle step freq to balance the bass and treble.
Because they will be more dominating than what comes from the back. It's to get somewhat equal dispersion.
You could get even better high dispersion by making a foam lens. Take a piece of foam that is thick enough to attenuate the highs. Then cut a ca. 2.5 cm wide vertical slit in it to make a lens.
This will both slightly attenuate the highs and dispersed them better
Oops I just remembered something.
The whole reason I wanted to do the drivers at an angle was to disperse the high frequency.
Actually, I just remembered something else: I don't think I would have lobing, would I?
Because of the angle of the drivers.
Another reason I wanted them at an angle.
Oh wait, I guess I would a little, but not as much as if they weren't on angle.
Maybe I should do 90 degrees?
So, one 30 cm^2 fullrange driver, then or a 2-way with 50-95 cm^2 mid and a Vifa XT25?
Any opinions.
Nearfield is one speaker 2 feet from me at 10 degree angle and another 3.3 feet away at 60 degree angle. Bit of an awkward setup. Maybe I should post a pic.
The whole reason I wanted to do the drivers at an angle was to disperse the high frequency.
Actually, I just remembered something else: I don't think I would have lobing, would I?
Because of the angle of the drivers.
Another reason I wanted them at an angle.
Oh wait, I guess I would a little, but not as much as if they weren't on angle.
Maybe I should do 90 degrees?
So, one 30 cm^2 fullrange driver, then or a 2-way with 50-95 cm^2 mid and a Vifa XT25?
Any opinions.
Nearfield is one speaker 2 feet from me at 10 degree angle and another 3.3 feet away at 60 degree angle. Bit of an awkward setup. Maybe I should post a pic.
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For what it is worth I designed a small two driver per speaker system more than 10 years ago. I used two Tangband W3-871S drivers per side in a 1.5 way arrangement. A series coil was inserted in series with the lower driver while the upper driver was run full range Thus the overall impedance is near 4 ohms at low frequencies as the two drivers are in parallel. As frequency increases the impedance transitions to 8 ohms at high frequencies as the inductance of the coil rolls off the response of the lower driver.
I still use these speakers for a small listening system in a bedroom. It looks good with purple heart side panels.
I still use these speakers for a small listening system in a bedroom. It looks good with purple heart side panels.
Low passing one of the drivers seems a real waste to me. Why not just use a real bass driver then? The FR drivers extension makes is possible to put the crossover low and get good integration.
Angling the drivers is a technique lots of manufacturers has been using for decades to get better coverage. Time window and and EPI microtowers spring to mind.
It's a good way to cure one of the few problems with FR drivers.
90 degrees seems like it should work well at close range. A good deal of reflections is going to be involved though, depending on the room.
Angling the drivers is a technique lots of manufacturers has been using for decades to get better coverage. Time window and and EPI microtowers spring to mind.
It's a good way to cure one of the few problems with FR drivers.
90 degrees seems like it should work well at close range. A good deal of reflections is going to be involved though, depending on the room.
For nearfield, use 1 driver /side, that gives you double the budget so you can afford a better driver.
dave
dave
If Jimmy doesn't already have the drivers, or even if amenable to suggestion for another model, my current favorite small drivers for nearfield would be the FF85WK or Mark Audio Alpair6P
Hi,
The 0.5 (or 1.5) way is a good idea for speakers placed on open
stands used farfield, and is certainly not a waste of the bottom
driver as it implements BSC and adds +6dB maximum output.
You still need a high pass and a sub for it to work well.
Nearfield two drivers will lobe, due to distances at any angle,
though it is so less so higher up the more you angle them.
A single driver with about 3dB of BSC and driver EQ done
at line level or within the PC can work well with a T amp.
You can't trust the graphs provided by TB much.
No sub, I'd add :
Peerless 830878 3-1/2" Passive Radiator
rgds, sreten.
The 0.5 (or 1.5) way is a good idea for speakers placed on open
stands used farfield, and is certainly not a waste of the bottom
driver as it implements BSC and adds +6dB maximum output.
You still need a high pass and a sub for it to work well.
Nearfield two drivers will lobe, due to distances at any angle,
though it is so less so higher up the more you angle them.
A single driver with about 3dB of BSC and driver EQ done
at line level or within the PC can work well with a T amp.
You can't trust the graphs provided by TB much.
No sub, I'd add :
Peerless 830878 3-1/2" Passive Radiator
rgds, sreten.
My setup is too awkward to know what to do.
I need really good off-axis response.
That's one reason why I wanted to use two angled 3 inch fullranges.
I might have to go two-way?
I posted a picture of my setup, but if you lol at how I live I will be really sad
lol 😀
The speakers can go where the white ones are now or one can go on top of the dresser where the candle is. The right one can go somewhere else too.
I use kx drivers and my Audigy 2 sound card. I would like to have 2 or 4 channels, but can go 6.
Each channel can play pretty much any frequencies and have many effects/eq.
I will probably add a subwoofer eventually.
I need really good off-axis response.
That's one reason why I wanted to use two angled 3 inch fullranges.
I might have to go two-way?
I posted a picture of my setup, but if you lol at how I live I will be really sad
lol 😀The speakers can go where the white ones are now or one can go on top of the dresser where the candle is. The right one can go somewhere else too.
I use kx drivers and my Audigy 2 sound card. I would like to have 2 or 4 channels, but can go 6.
Each channel can play pretty much any frequencies and have many effects/eq.
I will probably add a subwoofer eventually.
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I think maybe your original idea wasn't bad at all. Maybe a splayed cabinet with two drivers (like the roof of a house), hung on the wall would be a good idea? More desk space and more bass support.
You could even do it in foamcore to make it easier to get just the right angle. 90 degrees might not be optimal.
You could even do it in foamcore to make it easier to get just the right angle. 90 degrees might not be optimal.
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You could do a two driver variant of this speaker - which is a SSS (single speaker stereo). The foam core allows smooth 45 deg angle transitions and let me prototype this in 2 hrs. The bass response in this is not bad at all with 70 Hz extension. The W3-881sjf could probably work very well in this config.
I put this in a corner of a room and it sounds very nice. With a two driver and two speaker setup I imagine it can work well too.
More info in Master Nagaoka thread.
I put this in a corner of a room and it sounds very nice. With a two driver and two speaker setup I imagine it can work well too.
More info in Master Nagaoka thread.
How about, one driver in the front and two in the back?
Two in the back wired in parallel for 4 ohms and those two wired in series to the 8 ohm driver in the front?
So twice the power going to the back two.
And since there are two in the back it works out perfect, so all three get the same power.
And a total of 6 ohm load for the amp.
Does this sound right?
Is the setup a good idea?
Two in the back wired in parallel for 4 ohms and those two wired in series to the 8 ohm driver in the front?
So twice the power going to the back two.
And since there are two in the back it works out perfect, so all three get the same power.
And a total of 6 ohm load for the amp.
Does this sound right?
Is the setup a good idea?
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