Power rating for Inductors

Scorpion · 07-19-2007, 09:48 PM

I want to build a notch filter to smooth out the resonant freq of a horn in a midcab i built. The crossover is rated at 400w and the hf driver has a rating
of 80w. I have used the notch filter calc at Lalena.com and i got an LCR
of:

L=1.36 mH
C=54.6 uF
R=6.1 Ohms

Ive built a couple of things before but have not much experience with inductors. The inductors ive found at mouser dont show a max watt rating.
What power rating should i look for? What Voltage rating should i use on the 54.6 uF Cap?

Enzo · 07-20-2007, 01:08 AM

If this is part of the crossover, then it must handle the voltages and currents of the speakers and amp. That all depends upon power levels.

I wouldn't have looked at Mouser for these parts, so I don't know what they have. Parts Express has a pretty good selection of crossover parts.

But rather than this brute force method, why not just get a basic graphic EQ and insert it before the power amp? Or a parametric?

Scorpion · 07-20-2007, 02:16 PM

This is part of a speaker system in a single enclosure . It is a 15" x horn midcab. Next up will be a 18" bass bin. I'll check out parts express .

David Schwab · 07-20-2007, 02:22 PM

Why not just move the crossover point?

Scorpion · 07-20-2007, 03:12 PM

The speaker cabs are built ,loaded and the (nonadjustable) crossover is installed.
I used componants recomended by Eminences tech expert and i built the cab according to the formula given for that woofer by Eminence. The whole thing sounds good but needs some tweaking in the midrange. Lalena.com says i need a notch filter to cut the frequencies that are listed on the spec sheet of the horn as the "resonant frequency". BTW a Parts Express tech told me that the parts in an LCR circuit will only get a portion of the wattage that the horn gets. He said a 12w would work.

Steve Conner · 07-25-2007, 03:19 PM

Let me get this right, you're trying to use a horn tweeter below its resonant frequency? That's probably not such a good idea because too much LF energy could burn it out.

Normally the crossover point should be a good octave above the resonance. What crossover point does the maker of the horn recommend? and what crossover point are you actually using?

Scorpion · 07-25-2007, 04:10 PM

No, I'm running the tweet @ 1.6K . I have read that you can or should smooth out the midrange responce of the horn at the resonance frequency with a notch filter . Several websites have calculators to figure your LCR values based on the resonance frequency and impedance. However,
Ive opened up a couple of brand name cabs and i'm not seeing alot of tone shaping circuits, just crossovers.

07-19-2007, 09:48 PM	#1
Scorpion Junior Member Join Date: Jul 2007 Posts: 4	Power rating for Inductors I want to build a notch filter to smooth out the resonant freq of a horn in a midcab i built. The crossover is rated at 400w and the hf driver has a rating of 80w. I have used the notch filter calc at Lalena.com and i got an LCR of: L=1.36 mH C=54.6 uF R=6.1 Ohms Ive built a couple of things before but have not much experience with inductors. The inductors ive found at mouser dont show a max watt rating. What power rating should i look for? What Voltage rating should i use on the 54.6 uF Cap?

07-20-2007, 02:22 PM	#4
David Schwab Pickup Maker Join Date: May 2006 Location: Montclair, NJ Posts: 5,583	Why not just move the crossover point? __________________ Those who create are rare; those who cannot are numerous. Therefore, the latter are stronger. - Coco Chanel www.sgd-lutherie.com www.myspace.com/sgdlutherie www.myspace.com/davidschwab

07-25-2007, 03:19 PM	#6
Steve Conner Supporting Member Join Date: May 2006 Location: Glasgow, Scotland Posts: 2,981	Let me get this right, you're trying to use a horn tweeter below its resonant frequency? That's probably not such a good idea because too much LF energy could burn it out. Normally the crossover point should be a good octave above the resonance. What crossover point does the maker of the horn recommend? and what crossover point are you actually using? __________________ "Ohhhh miracle bulb shines feebly"

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07-20-2007, 01:08 AM	#2
Enzo Senior Member Join Date: May 2006 Location: Lansing, Michigan, USA Posts: 10,303	If this is part of the crossover, then it must handle the voltages and currents of the speakers and amp. That all depends upon power levels. I wouldn't have looked at Mouser for these parts, so I don't know what they have. Parts Express has a pretty good selection of crossover parts. But rather than this brute force method, why not just get a basic graphic EQ and insert it before the power amp? Or a parametric?

07-20-2007, 02:16 PM	#3
Scorpion Junior Member Join Date: Jul 2007 Posts: 4	This is part of a speaker system in a single enclosure . It is a 15" x horn midcab. Next up will be a 18" bass bin. I'll check out parts express .

07-20-2007, 03:12 PM	#5
Scorpion Junior Member Join Date: Jul 2007 Posts: 4	The speaker cabs are built ,loaded and the (nonadjustable) crossover is installed. I used componants recomended by Eminences tech expert and i built the cab according to the formula given for that woofer by Eminence. The whole thing sounds good but needs some tweaking in the midrange. Lalena.com says i need a notch filter to cut the frequencies that are listed on the spec sheet of the horn as the "resonant frequency". BTW a Parts Express tech told me that the parts in an LCR circuit will only get a portion of the wattage that the horn gets. He said a 12w would work.

07-25-2007, 04:10 PM	#7
Scorpion Junior Member Join Date: Jul 2007 Posts: 4	No, I'm running the tweet @ 1.6K . I have read that you can or should smooth out the midrange responce of the horn at the resonance frequency with a notch filter . Several websites have calculators to figure your LCR values based on the resonance frequency and impedance. However, Ive opened up a couple of brand name cabs and i'm not seeing alot of tone shaping circuits, just crossovers.

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