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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Thanks a lot, but I guess I wasn't clear... posted by Twistnshout on May 21, 2001 at 17:15:07:
An L-pad consists of a series resistive elemetyn, and a shunt resistive element. You would have to measure both to arrive at the fixed pad equivalent.AN 8 ohm L-pad will maitain a nominal 8 ohms as it is adjusted, and not add to the speaker impedance already there.
As an example:0 dB attenuation is 0 ohm series, open shunt.
-3 dB atten is 2.34 ohms, and shunt of 19.4 ohms
-6 dB atten. is 4 ohm series, 8 ohm shunt
-9 dB is 5.16 and 4.4
-12 dB is 6.0 and 2.7All of these assume an 8 ohm resistive load, as do almost all commercially available L-pads.
If you know what the sensitivity difference between the two drivers is, then you should be able to judge the amount of tweeter atenuation needed, and try a few fixed L-pad values and see which one sounds the most balanced. This eliminates any potential errors when measuring the l-pad for values.
In any case, given the drivers you state, your tweeeter atenuation will probably be on the order of about 12 dB, rather the the 14 that the straight sensitivity ratings would tend to indicate. If you do use the L-pad method, and measure the series and shunt resistances, they should come out very close to what I posted for the -12 dB case.
Jon Risch
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Follow Ups
- Re: Thanks a lot, but I guess I wasn't clear... - Jon Risch 01:02:15 05/22/01 (1)
- Hugely helpful--thanks so much! (nt) - Twistnshout 06:33:43 05/22/01 (0)
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