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3db passive cut for tweeters


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gandalf91 
Member - Posts: 35
Member spacespace
Joined: August 30, 2011
Location: Florida, United States
Posted: August 30, 2011 at 1:49 PM / IP Logged  
Hey everyone, I'm new here and began constructing my first custom mobile audio system near the beginning of summer. I am now almost complete but I do have one little nit-picky modification I would like to make to my most recent item installed (a JBL P660c component speaker set). The crossover units included with each woofer/tweeter pair has a nice feature for a 6db high-cut to the tweeter. When I installed the set and powered on for the first time I found the tweeter presence to be a bit in excess. So I hit the high cut...well that leaves things sounding a bit muffled, and also affects the imaging a bit negatively (IMO).
So I decided I want to implement a 3db cut and get the best of both worlds. My initial thought was add another 2-ohm resistor in series between the crossover and tweeter in order to cut the power in half...then I read even a passive resistor will dissipate power with it, resulting in a four-fold decrease in power, leaving back at square one with -6db.
So I'm wondering if anyone here could point me in the right direction toward rigging up something through other means. Perhaps a voltage regulator of some sort?
DYohn 
Moderator - Posts: 10,741
Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: April 22, 2003
Location: Arizona, United States
Posted: August 30, 2011 at 3:49 PM / IP Logged  
gandalf91 
Member - Posts: 35
Member spacespace
Joined: August 30, 2011
Location: Florida, United States
Posted: August 30, 2011 at 4:13 PM / IP Logged  
Thanks! I had never heard of these types of circuits before, but that seems like it will fit the bill perfectly. I did return with some obscure values though. 0.58ohms for R1 and 4.84 for R2. Might be a bit tricky to find something like that (maybe I'm wrong). I suppose I could try and use a 0.5ohm and a 5ohm resistor. Might result in something closer to a 2.5 db cut from what I gather playing around with the calculator, but that's completely fine!

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