Calcutlating adaption of loudspeaker filter circuit
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Posted by Rene on August 4, 2008, 9:59 am
Please log in for more thread options Some time ago I decided to built myself a good speaker set for my computer. I have already built two Visaton CT Center 81's (http://www.visaton.com/en/bauvorschlaege/computer/856/index.html), they sound great but need a subwoofer which is the next I will build (this one http://www.visaton.com/en/bauvorschlaege/subwoofer/564/index.html), together with 3 more of these little speakers (their looks are even better then their sound, though one might think otherwise when looking at the one on the site - I also did not use the grid). I also wanted to build my own "5.2" amplifier (two separate amps for the speakers in the subwoofer, that's what I meant with the .2 and the ""'s) based on not-too-expensive integrated amplifiers but now I managed to lay my hands on a Technics 5.1 home cinema receiver for much less money than the diy option would cost (the sub output is passive so I will have to build an amplifier for that, but that's no problem). However, now I have another problem. The receiver wants surround speakers of at least 6 ohms where the CT Center 81 is only 4. In the past there was a CT Center 80, the difference was in the filter that was less sophisticated but also had an impedance of 6 ohms. I could of course use that design to built into my speakers but I think it would not improve sound quality (it won't be just for fun that Visaton changed the design). Unfortunately I have not much knowledge about the math behind filters. I was hoping to find someone in this group able and of course willing to have a look at the schematics and the technical data I have put at the bottom of my post and see of he/she would know how I might change the values of some components in my current filters. Many thanks in advance! Yours sincerely, Rene The filter of my speakers is: http://www.visaton.com/bilder/weichen/gross/ct_center81_w.gif. The old version can be seen on http://www.visaton.com/bilder/weichen/gross/ct_center80_w.gif but as I said, I would rather use the first one. Data from the SC5 tweeter are here: Nominal power handling with high pass 60 Watt (12 dB/Okt.; 6000 Hz) Peak power handling with high pass 100 Watt (12 dB/Okt.; 6000 Hz) Nominal impedance 8 Ohm Frequency response (-10 dB) 1500 - 22000 Hz Mean sound pressure level 90 dB (1W/1m) Resonance frequency fs 2500 Hz Magnetic induction 0,7 Tesla Magnetic flux 33 µWeber Voice coil diameter 1,3 cm Height of winding 0,18 cm Cutout diameter 4,8 cm Net weight 0,098 kg D.C. resistance Rdc 6,2 Ohm Inductance of the voice coil L 0,08 mH And here are the data of the F8SC "woofer": Nominal power handling 20 Watt Peak power handling 30 Watt Nominal impedance 8 Ohm Frequency response (-10 dB) 80 - 15000 Hz Mean sound pressure level 82 dB (1W/1m) Maximum cone displacement 5 mm Resonance frequency fs 103 Hz Magnetic induction 0,8 Tesla Magnetic flux 150 µWeber Height of front pole-plate 3 mm Voice coil diameter 2 cm Height of winding 0,45 cm Cutout diameter 7,6 cm Net weight 0,25 kg D.C. resistance Rdc 7,7 Ohm Mechanical Q factor Qms 3,03 Electrical Q factor Qes 1,52 Total Q factor Qts 1,01 Equivalent volume Vas 1,4 l Effective piston area Sd 30 cm2 Dynamically moved mass Mms 2,2 g Force factor Bxl 2,69 T · m Inductance of the voice coil L 0,35 mH | ||||||||||
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