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Old 24th June 2012, 01:18 PM   #1
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Default Attenuator for tweets or mids

this thread is the result of a silly question someone asked me

can we use resistors in signal path to attenuate a speaker? for example to attenuate a tweeter which has a higher db than other drivers... or to attenuated mid-range?
if I got a "Yes"here, what Ohm should we use? can a variable pot (like ALPS) be used to do so? we should put it on a small PCB with a jumper, while the jumper is locked all the signal passes through, unlock the bridge and here we adjust the pot!

Alkeng.com have some nice attenuators: link

Click the image to open in full size.
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Old 24th June 2012, 01:26 PM   #2
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Yes you can. do a search on Lpad. You can buy variable ones but they don't work like normal potentiometers.

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Old 24th June 2012, 01:50 PM   #3
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Quote:
Originally Posted by wintermute View Post
Yes you can. do a search on Lpad. You can buy variable ones but they don't work like normal potentiometers.

Tony.
I far as I know potentiometers are either liner or logarithmic... both will do the -db function but I think liner one is better and easier to adjust... I got some high quality Alps 100KAX6 (logarithmic) and 100KBX2 (liner) pots... can I use them?
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Old 24th June 2012, 02:23 PM   #4
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well, I think resistors with 5watt is minimum power rating

using too big fixed pad resistors, it might be interesting to place a variable resistor in paralel with each
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Old 24th June 2012, 03:36 PM   #5
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Quote:
Originally Posted by tinitus View Post
well, I think resistors with 5watt is minimum power rating

using too big fixed pad resistors, it might be interesting to place a variable resistor in paralel with each
I learned from Klipsch crossovers to use autotransformer to attenuate and do -db function... will using resistors result in destroying some of sound or increasing sound distortion?
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Old 24th June 2012, 03:44 PM   #6
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by ARIYAHOOR View Post
... will using resistors result in destroying some of sound or increasing sound distortion?
these days I use only series resistors
destroys the signal ?
well, isnt that the purpose

joke aside
it all affects the signal
just make sure it helps more than it hurts, and you have gained more than lost
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Old 24th June 2012, 03:44 PM   #7
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Transformers are useful to match impedances , but can eat most of the budget when making an Xover . You can read the part regarding the L-pad adjustments in the sticky thread made by Allen B ; they can become part of the X-over itself , like determining
shape , steepness depending on the position .
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Old 24th June 2012, 10:19 PM   #8
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L pad calculator - attenuation dB damping impedance decibel loudspeaker speaker voltage divider - sengpielaudio Sengpiel Berlin
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