I am designing a center channel speaker for a friend down the hall (I am in a dorm), and I am thinking of a WWTWW configuration with the Tangband W4-616S shielded wide range driver and the Tangband 25-302S shieldeded neodymium tweeter (both can be found at Parts Express). I am trying to think of a way to get some decent dispersion out of the tweeter, so I am spacing the woofers as far away from the tweeter as I can without exceeding the 24" width of the unit or having the distance from the acoustic center of each driver pair exceed the wavelength of the crossover frequency. I'm wondering what kind of a crossover I should use for this. I am thinking second-order Linkwitz-Riley at 5000 Hz. I am also wondering what kind of woofer spacing will help the most to cut down on the comb-filtering. I only really need 45 or 50 degrees horizontal off axis dispersion.
why such a high XO point? woofer 24" apart might crate lobing.
I would do the follow:
make 2.5 way.
outer woofers LP 300Hz
inner woofers 3k 6db
tweeter 3k 12db.
I would do the follow:
make 2.5 way.
outer woofers LP 300Hz
inner woofers 3k 6db
tweeter 3k 12db.
oh i forgot.
outer woofers in series
inner woofers is series
this way load does not drop too low.
outer woofers in series
inner woofers is series
this way load does not drop too low.
I to am just starting a center channel for Bob of CSS.
Will use the W3-319S1 and the W3-871S in the same WWTWW
to match to the Spires I just finished that uses the same drivers.
Run the drivers in parallel and series to get the proper load.
And it does not mater if the outer two drivers are parallel and the inside series or the right side paralell and the left series.
You end up with the same load.
The W4 drivers will work but cross them low.Not high.
The tweeter you may have to change.As all the 28-847S and 25-302S need a 2500-3000 xover point.
you need to go lower to stop the problems you will soon walk into.
You are looking at a point of around 1000k to start.
Al
Will use the W3-319S1 and the W3-871S in the same WWTWW
to match to the Spires I just finished that uses the same drivers.
Run the drivers in parallel and series to get the proper load.
And it does not mater if the outer two drivers are parallel and the inside series or the right side paralell and the left series.
You end up with the same load.
The W4 drivers will work but cross them low.Not high.
The tweeter you may have to change.As all the 28-847S and 25-302S need a 2500-3000 xover point.
you need to go lower to stop the problems you will soon walk into.
You are looking at a point of around 1000k to start.
Al
1000k? 1K? that is in the middle of the critical vocal range.
i agree with a XO around 3k. my idea of using the outer (319) in series and then the inner (871) in series is to reduce lobing.
take the outer (319) in series via a single inductor at 300Hz, take the inner (319) in series via a LP network at 3k. below 300Hz all 4 drivers will be operational droping imp down to 8 ohms. between 300-3k imp will gradually rise to 12 ohms before the tweeter kicks in and drop the system's imp down again. you can get a rough simulation of this using LSPCad.
i agree with a XO around 3k. my idea of using the outer (319) in series and then the inner (871) in series is to reduce lobing.
take the outer (319) in series via a single inductor at 300Hz, take the inner (319) in series via a LP network at 3k. below 300Hz all 4 drivers will be operational droping imp down to 8 ohms. between 300-3k imp will gradually rise to 12 ohms before the tweeter kicks in and drop the system's imp down again. you can get a rough simulation of this using LSPCad.
- Status
- Not open for further replies.