Just a little info on those enclosures...
They would be roughly 40" high, 20" wide and 12" deep at the center of the baffle. At 20" wide, BS is around 230 Hz. Of course, none of this is set in stone and I can adjust all dimensions as needed to dial in the system.
Now as far as playing around with these online x-over calculators, they ask for HP and LP impedance. I'm assuming this should be the actual Re of the drivers and not the nominal impedance of 8 ohms. IWO, 7.2 ohms for the Alpair, 5.7 ohms for the Scanspeak.
How close to being "in the ballpark" do these calculators get you? Being 1st order, they will have a 90 degree phase swing. Is there any way of correcting that or is it even worth it?
I notice the inductors are around the 3.5mH mark which isn't too bad, but those caps! Upwards of 85uF!
They would be roughly 40" high, 20" wide and 12" deep at the center of the baffle. At 20" wide, BS is around 230 Hz. Of course, none of this is set in stone and I can adjust all dimensions as needed to dial in the system.
Now as far as playing around with these online x-over calculators, they ask for HP and LP impedance. I'm assuming this should be the actual Re of the drivers and not the nominal impedance of 8 ohms. IWO, 7.2 ohms for the Alpair, 5.7 ohms for the Scanspeak.
How close to being "in the ballpark" do these calculators get you? Being 1st order, they will have a 90 degree phase swing. Is there any way of correcting that or is it even worth it?
I notice the inductors are around the 3.5mH mark which isn't too bad, but those caps! Upwards of 85uF!
I'm assuming this should be the actual Re of the drivers and not the nominal impedance of 8 ohms. IWO, 7.2 ohms for the Alpair, 5.7 ohms for the Scanspeak.
No. That is the REAL part of the impedance at DC. A starting point is the impedance at the XO point.
dave
No. That is the REAL part of the impedance at DC. A starting point is the impedance at the XO point.
dave
So I put in 8 ohms for LP and HP on the calculator(s)?
But seriously, it might be time to migrate this chain of exchange to the general FR or even Multi-way forums?
Yeah, that has proven useless. I started a thread yesterday morning and it's gotten nowhere, though several threads have started since mine, even one this afternoon and they already have multiple replies. I guess I'm not well liked on this forum.
No. That is the REAL part of the impedance at DC. A starting point is the impedance at the XO point.
dave
No. You look at the impedance curve at the point where you XO as a starting point. Iy is just a starting point, the calculator assumes the impedance is REAL, when it is really COMPLEX. And it assumes the drivers have flat response.
dave
Thank you, Dave.
Yeah, that has proven useless. I started a thread yesterday morning and it's gotten nowhere, though several threads have started since mine, even one this afternoon and they already have multiple replies. I guess I'm not well liked on this forum
Not at all - but note how quickly the conversation turned towards discussion of XO methodology, not just topology?
There must be reasons for that
I wish you success with the project
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