I'm planning a midbass and horn setup and want to go passive. I realise I need to seriously attenuate the horns (approx 105dB efficiency and 8Ohm drivers) in relation to the midbass (approx 89dB efficiency and 4ohm) my amp is happily 2 ohm stable.
I know I can use a simple Lpad (I have a variable rotary L-pad for initially setting the horn level) but would their be any benefit (bear in mind I have already built the Xover so don't want to change the driver impedance) in running a 16Ohm compression driver with a 16ohm resistor in parallel to get my 8 Ohm load. This would reduce the sensitivity without having a resistor in series. Would this be any better than an L-Pad, I have heard people saying that series resistors can 'suck the life' out of detailed treble units.
I know I can use a simple Lpad (I have a variable rotary L-pad for initially setting the horn level) but would their be any benefit (bear in mind I have already built the Xover so don't want to change the driver impedance) in running a 16Ohm compression driver with a 16ohm resistor in parallel to get my 8 Ohm load. This would reduce the sensitivity without having a resistor in series. Would this be any better than an L-Pad, I have heard people saying that series resistors can 'suck the life' out of detailed treble units.
Puggie said:
You can try to simply use resistors... if you really think those efficency figures are accurate
autoformers! Fostex is a good "off the shelf" choice... adjustable from 0 to -20 dB.
Cyclotronguy
Cyclotronguy
Resistors in series should be fine as long as you use Non-Inductive ones.... if you add an inductive resistor in series, it will almost surely "suck the life" out of your tweeter
had the same problem
I found that the mills resistors from Parts Express did a beautiful job in this application.Make suere you got thoose attenuation values right.
My DC horn went from dull to crisp in a jiffy!
I found that the mills resistors from Parts Express did a beautiful job in this application.Make suere you got thoose attenuation values right.
My DC horn went from dull to crisp in a jiffy!
Radio Shack has a transformer volume control for controlling speakers in another room. The stereo version has two step down transformers on it. I just used them to cut down my 95dB tweeters to match the 85dB woofers. The initial listening test is very good. if you don't mind buying a product and tearing it apart for parts it may work for you.
The draw back is the first two steps are 3dB each followed by 2dB steps for a total of 22 dB in ten steps.
Radio Shack Part Number
mono 40-993
Stereo 40-987
Brian
The draw back is the first two steps are 3dB each followed by 2dB steps for a total of 22 dB in ten steps.
Radio Shack Part Number
mono 40-993
Stereo 40-987
Brian
roddyama said:
I second that.
Active xover or passive line stage xover are even better.
Try that, you'll never go back.
Any attenuation between amp & drivers would suck the life out of them. The larger the attenuation, the worse.
Filters in line stage are much easier to be done right. Low power amps for mid-high are also not hard to build or expensive to buy.
If you have to have xover, be it mechanically (full range), or in line stage.
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