Hi
Starting a new build soon, these are 2.5-way mains and 2-way center and surrounds.
Drivers are the W14 Silver Flute woofers, and the Hi-Vi K1 tweeters - bargain-basement priced drivers.
I need help with the crossover design for those mains, desperately.
I have three questions:
1. To design the L-pad for a 2.5 way speaker, do I need to take the combined SPL of the upper and .5 woofer together, or just one woofer? I thought it was only one, but I see Zaph's TMM uses no L-pad on the tweeter, so I'm a bit thrown off. I assumed the second woofer was only correcting the response in the baffle step area.
2. To create a basic set of crossover values, do I need to take the nominal driver impedance, or the actual impedance at the crossover point? I'm getting a very wierd set of values using spreadsheets, though they look a lot closer to real designs. I'm aiming for a 1.8 KHz crossover. This gives me 2.2. mH/3.5uF on the woofer for 2nd order LR, and 4.3 uF and 1.8 mH on the cap. That 1.8 mH looks wierd, but it could just be me. I thought the cap should be bigger, and the coil smaller at that frequency.
3. To derive the inductor for the .5 woofer, do I subtract the inductance of the first inductor? I am referring to the XO Zaph shows on his TMM project. I was aiming for a 1st order at the F2 frequency on a 7.5" wide baffle, giving me a 4.7 mH - so I was thinking what I need is a 2.5 mH after reducing the value of the first inductor.
Thanks in advance for your help.
Sangram
Edit:
Sorry three last Qs
1. When I'm calculating the tweeter XO, I had added the L-pad series resistance to the impedance at the XO point. Is that the right thing to do?
2. I'm guessing I'll need a notch filter - there is a nice one designed for this woofer on Zaph's page - could that be used, you think, without changing anything else?
3. With the zobel and the crossover cap, should I still put in a Zobel? This is becomign a very complex crossover if I need that as well.
Starting a new build soon, these are 2.5-way mains and 2-way center and surrounds.
Drivers are the W14 Silver Flute woofers, and the Hi-Vi K1 tweeters - bargain-basement priced drivers.
I need help with the crossover design for those mains, desperately.
I have three questions:
1. To design the L-pad for a 2.5 way speaker, do I need to take the combined SPL of the upper and .5 woofer together, or just one woofer? I thought it was only one, but I see Zaph's TMM uses no L-pad on the tweeter, so I'm a bit thrown off. I assumed the second woofer was only correcting the response in the baffle step area.
2. To create a basic set of crossover values, do I need to take the nominal driver impedance, or the actual impedance at the crossover point? I'm getting a very wierd set of values using spreadsheets, though they look a lot closer to real designs. I'm aiming for a 1.8 KHz crossover. This gives me 2.2. mH/3.5uF on the woofer for 2nd order LR, and 4.3 uF and 1.8 mH on the cap. That 1.8 mH looks wierd, but it could just be me. I thought the cap should be bigger, and the coil smaller at that frequency.
3. To derive the inductor for the .5 woofer, do I subtract the inductance of the first inductor? I am referring to the XO Zaph shows on his TMM project. I was aiming for a 1st order at the F2 frequency on a 7.5" wide baffle, giving me a 4.7 mH - so I was thinking what I need is a 2.5 mH after reducing the value of the first inductor.
Thanks in advance for your help.
Sangram
Edit:
Sorry three last Qs
1. When I'm calculating the tweeter XO, I had added the L-pad series resistance to the impedance at the XO point. Is that the right thing to do?
2. I'm guessing I'll need a notch filter - there is a nice one designed for this woofer on Zaph's page - could that be used, you think, without changing anything else?
3. With the zobel and the crossover cap, should I still put in a Zobel? This is becomign a very complex crossover if I need that as well.
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