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Hi,
I have paradigm S8's with a 2 channel setup (normal 2 channel preamp/and monoblocks) and wish to integrate a subwoofer. There are two ways i can do this.1) Let the s8's roll off naturally and let them run full range, .... tune in the subwoofer to carry the bottom octaves i.e. 15Hz-41Hz?? or should i go higher to overlap where the s8's bottom out)...
2) use an x30 active external x over and run the s8's through the 50Hz (vs the 80 or 120 hz) high pass output and dial in the subwoofer to fill in a little more i.e. 15/20Hz to 50 or 60Hz).....
Which is more appropriate for the s8's "full range" (freq 41hz-20khz)
just so you know,
I have powerful 500wpc mcintosh MC501 monoblocks so i'm not too concerned about "relieving" the amps of the lower octaves (and therefore less current demand)..i was wondering if relieving the S8's of the Lower few octaves (i.e. under where they "roll off") would relieve them a bit and open up their midrange/high bass..i.e. if I use option #2....Or is the midrange clarity not effected by the way their x overs are set up..
The downside in #2 as i see it is that i'm using more interconnects...an external x over...i.e. more stuff in the equation......Hopefully you'll understand this question...i think i made it more complicated than intended..could you give me some advice??
thanks...
Follow Ups:
Go with option 1.
You can set the sub's LP filter set at 10Hz or 1 octave above the lowest -3dB (e.g 40Hz) frequency of the main speakers.
Depending on the subs roll off rate which typically should be 24dB/octave, set the sub to begin roll off at 50Hz or 80Hz or anywhere in between if the sub's roll off rate differs.
I've tried it both ways with my KEF 104/2s and Velodyne HGS-15. I prefer the THX setting of passing frequencies below 80 Hz to the sub. It seems to make for greater transparancy. I don't think it's that the efficient 104/2s stress my 250 watt per channel amp in full range; I suspect it has to do with the speaker itself. Why not try both ways and decide for yourself which you prefer?db
I am an advocate of rolling off the extreme low end and passing that to the sub for two reasons not mentioned:
1. That permits you to position the S8s for optimal balance and imaging without the constraint of getting the extreme bass bass right as well. Accomplishing all three is usually not possible and leads to compromise.
2. The sub can be positioned for optimal bass performance and equalized to minimize the influence of room modes which are inevitable in that range.Kal
Here are some specs regarding the speakers and xovers..maybe this will help for you folks more in the know....Paradigm S8
Design
6-driver, 3-way, MagneShield™ (four bass drivers, one mid, one tweeter
Crossover
3rd-order electro-acoustic at 1.8 kHz
2nd-order electro-acoustic at 250 Hz
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