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Old 1st February 2007, 10:19 PM   #1
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Unhappy Mid range too forward?

Pls,i need help with my kenwood 3way speaker. it utilize horn tweeter,horn midrange n 10inch woofer. the problem is that the midrange and high note are too forward while the bass is lack of size tho its a large 10inch paper cone driver. how do i pull back the mid and high note and push to bigger bassline???? how do i tweak the crossover??? thank you...
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Old 2nd February 2007, 02:20 AM   #2
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You add L-pads after the XO. You can buy the variable rotary ones or if you know how much attenuation you need, you can do it with a few resistors. The trick is to not change the overall impedance of the circuit. For example if your mid is 8 ohms at the XO point, you can add a series of 4 ohms and a parallel of 8 ohms after and get a 3 dB drop in level.

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Old 2nd February 2007, 04:46 AM   #3
Pano is offline Pano  United States
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As Cal says. L-Pads. The vaiable type will help you dial in the sound you want.

Your crossovers almost certainly have some form of attenuation for the highs and mids. But it seems that you need more.

BTW, like your user name!
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Old 3rd February 2007, 11:30 AM   #4
Geoff H is offline Geoff H  Australia
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Hate to be pedantic, but doesn't Cal's attenuator drop the voltage by a factor of two, thus power by a factor of 4. That's 6dB. Probably just a typo.

As a guide, -3dB is barely audible, -6dB is, -10dB sounds like half the volume.

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Geoff.
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Old 3rd February 2007, 03:08 PM   #5
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You may be right as I'm not a big technical guy. I thought that since the circuit is still 8 ohms and the driver is receiving half of it, I said 3 dB. He could do the same thing by using a 16 ohm bypass and a series 8 ohm after. Doing that way seems to divide the power among the resistors better. Am I on base here?
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Old 3rd February 2007, 04:52 PM   #6
adason is offline adason  United States
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hi tome arm

i have Lafayette speakers which i use in the laboratory as background noise makers
they utilize horn midrange and tweeters as your kenwoods
had the same problem as you
upper midrange sounded like chainsaw
i did not want to bother with lpads /those speakers costed less than lpads would/ so i lightly stuffed the throat of midrange horn with sound absorbing wool...you can achieve any attenuation you desire, its fully reversible, its fun!
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Old 4th February 2007, 07:02 AM   #7
Geoff H is offline Geoff H  Australia
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Yeah, Cal, your close. The 2nd example sees a 16ohm resistor across a 8 ohm VC. (Tut tut, were all assuming an 8 ohm system) giving 5.3 ohms, forming the lower leg of the voltage divider. The series resistor being 8 ohm, will cause a voltage ratio of 0.376, or a power ratio of 0.14, or about 8db. The load on the crossover is 13.3 ohms.

Tone Arm, I'd try Cals first example. A few resistors wont cost much. 6dB will make a considerable change to the balance.

Cheers,
Geoff.
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Old 4th February 2007, 07:13 AM   #8
Pano is offline Pano  United States
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Gee, Geoff -- I like Adason's idea. Stuff the horn! (so to speak)
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Old 4th February 2007, 08:11 AM   #9
Geoff H is offline Geoff H  Australia
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Yeah, I'll do a trade. I have a couple of docile mids and tweets about.

Edit: Panno, good thing you're surrounded by ocean. Less chance of him dropping by and stuffing your masterpieces.
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Old 4th February 2007, 08:59 AM   #10
Nordic is offline Nordic  South Africa
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Wish there was a similar easy fix for bright tweeters... mine were from a pretty high efficiency box... now used with new woofers... they are WAY too bright...
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