QUESTION FOR A ELICTRICAL ENGINEER
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Silver Member Username: Langless28Post Number: 403 Registered: Dec-04 | ok this is for my dual 6.5" tang band abc box setup for home. if im correct, according to the12volt.com. and using their calculators. if i wanted a high pass filter on my subs of 25hz, all i would have to do is connect a 796ufd cap in series to the pos lead of the speaker? |
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Silver Member Username: Langless28Post Number: 405 Registered: Dec-04 | someone has to know and i know i spelled electrical engineer wrong. |
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Platinum Member Username: GlasswolfWisteria, Lane USA Post Number: 11431 Registered: Dec-03 | that's a first order crossover. 6dB. way too shallow. I'd go no shallower than 12dB/octave for subs. probably 18dB given the choice. |
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Platinum Member Username: GlasswolfWisteria, Lane USA Post Number: 11432 Registered: Dec-03 | in fact since you're doing this as an ISF, I'd say go 24dB slope. cut it off sharply. Otherwise you could damage the drivers. |
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Silver Member Username: Langless28Post Number: 407 Registered: Dec-04 | yeah thanks glasswolf, acutally i was gonna put your name in the tread title but i though id give others the chance, but what did u mean kby ISF. i gotta read up on this stuff. ha, and does the voltage of the cap and what material its made of make a diff? |
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Platinum Member Username: GlasswolfWisteria, Lane USA Post Number: 11437 Registered: Dec-03 | use mylar non-polarized 1% tolerance capacitors. they'll be high quality. ISF is infrasonic filter. (subsonic filter) |
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Silver Member Username: Langless28Post Number: 411 Registered: Dec-04 | thanks alot, so the cap voltage doesnt matter? |
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Silver Member Username: Langless28Post Number: 413 Registered: Dec-04 | and is their a online parts store to purchase caps and other small electrical components. i go to wentworth institute of technology, you think one of the EE professors would have one layin around somewhere |
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Silver Member Username: Langless28Post Number: 415 Registered: Dec-04 | ? |
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Gold Member Username: RedlinerWilmington, Ma Post Number: 1164 Registered: Jun-05 | you go to wentworth in boston by any chance |
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Silver Member Username: Langless28Post Number: 417 Registered: Dec-04 | yeah |
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Gold Member Username: B101Queen City, NC USA Post Number: 2117 Registered: Sep-05 | dude, dont be cheap, its only like a few cents at radio shack..  same few cents they add with them component filters.. |
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Gold Member Username: RedlinerWilmington, Ma Post Number: 1168 Registered: Jun-05 | aww nice job man tough school i wanted to go there but im gonna be going to umass lowell thats cool though good luck there |
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Gold Member Username: InsearchofbassPost Number: 4746 Registered: Jun-04 | bassfishing being new to the area of designing crossovers i was wondering if you could explain how you figured out the capacitor you needed or do you have a website to teach the concept |
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Gold Member Username: InsearchofbassPost Number: 4747 Registered: Jun-04 | oh i see 12 volt.com |
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Silver Member Username: Langless28Post Number: 418 Registered: Dec-04 | theirs the 12volt.com and i found this site useful but confusing http://sound.westhost.com/lr-passive.htm good luck sean. im building mine for my abc box. i want to make a highpass(used for subsonic) filter of about 29hz, glasswolf said use 24db/octave, but its real complicated and the tolerances must be more exact and since heat from the coils changes impendance, a 24db/octave crossover might acually distort the music real bad even if the crossover is made well. i think im gonna go with 18db or possibly a 12db/octave crossover. |
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Platinum Member Username: GlasswolfWisteria, Lane USA Post Number: 11439 Registered: Dec-03 | here; http://www.pac-audio.com/products/productsCatagory.asp?mmSearch=Crossovers scroll down to the 100W capacitors and the chokes |
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Silver Member Username: Langless28Post Number: 419 Registered: Dec-04 | thanks alot glasswolf, are all those completed crossover netoworks or components? |
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Platinum Member Username: GlasswolfWisteria, Lane USA Post Number: 11444 Registered: Dec-03 | both, on that page. they have the components for building your own though if you scroll down about a page or so.. chokes are first then the caps right after. can't miss em. yellowish or light grey (I forgot) radial caps |
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Silver Member Username: Langless28Post Number: 421 Registered: Dec-04 | thanks. do u know the plan for a 24db/octave crossover 12volt.com only has it up to 18 which is prolly what im going to do. and is my assumption right on the above post were 24db crover. can distort the music cus of high tolernaces and change in impendance? |
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Platinum Member Username: GlasswolfWisteria, Lane USA Post Number: 11453 Registered: Dec-03 | I've never had an issue with steep filters, but 18dB is plenty steep to cut off those subs. that'll do just fine. cheaper, easier to build, does the job. |
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Platinum Member Username: GlasswolfWisteria, Lane USA Post Number: 11454 Registered: Dec-03 | PS a 24dB filter would be an adaptation of a linkwitz-riley filter. here: http://kahuna.sdsu.edu/~tucker/diyaudio/xover.html |
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