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Thread: What pot to adjust volume of single driver in loudspeaker?

  1. #1
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 1,250
    I'm Chris.

    Default What pot to adjust volume of single driver in loudspeaker?

    I want to trim and balance the volume of the mid range driver of my 3 way speakers. I think a potentiometer is what is needed, but which one? The driver to be adjusted is about 6 ohms.
    Source
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    Pre amps -- Hi fi Collective twin mono ladder stepped attenuator, with Charcroft Z-foil and silver wired. And First Watt B1 active no gain buffer.
    Power amps -- Welborne 45 SET monoblocks 1.8W / Decware Taboo 6W / Elekit 300B TU-8600SVK plus further improved components 9W / ICE Power 1000W
    Speakers
    Highly modified Endorphin P17 open baffle speakers containing both vintage and modern alnico drivers and paper cones. All silver wired - 8" Cube Audio FC8 full range drivers and vintage 15" Altec VOTT 416 bass drivers. All sat on Townsend Audio Podium seismic isolation platforms.
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  2. #2
    Join Date: Mar 2018

    Location: Queensland, Australia

    Posts: 33
    I'm Dazz.

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    You need an L-pad like one of these https://www.parts-express.com/cat/speaker-l-pads/306

  3. #3
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 1,250
    I'm Chris.

    Default

    Quote Originally Posted by garrard View Post
    You need an L-pad like one of these https://www.parts-express.com/cat/speaker-l-pads/306
    Thanks Dazz. I take it if my driver is 6 ohms then 8 ohms is the closest L Pad and will be fine.

    Out of interest, when the driver volume is optimised can I measure the two resistances in the L Pad and replace with a pair of high quality resistors?
    Source
    SW1X Universal Music Server UMS I Signature with Power Supply Unit PSU I Signature
    SW1X USB II
    SW1X DAC III Special
    Audiolab 6000 CDT transport
    Amps
    Pre amps -- Hi fi Collective twin mono ladder stepped attenuator, with Charcroft Z-foil and silver wired. And First Watt B1 active no gain buffer.
    Power amps -- Welborne 45 SET monoblocks 1.8W / Decware Taboo 6W / Elekit 300B TU-8600SVK plus further improved components 9W / ICE Power 1000W
    Speakers
    Highly modified Endorphin P17 open baffle speakers containing both vintage and modern alnico drivers and paper cones. All silver wired - 8" Cube Audio FC8 full range drivers and vintage 15" Altec VOTT 416 bass drivers. All sat on Townsend Audio Podium seismic isolation platforms.
    BK Electronics XLS400FF Sub.
    Cabling
    Silver mains cables, interconnects and speaker cables by SW1X
    Headphones
    HRT HeadStreamer and SennHeiser HD650 headphones

  4. #4
    Join Date: Mar 2018

    Location: Queensland, Australia

    Posts: 33
    I'm Dazz.

    Default

    Quote Originally Posted by bumpy View Post
    Thanks Dazz. I take it if my driver is 6 ohms then 8 ohms is the closest L Pad and will be fine.

    Out of interest, when the driver volume is optimised can I measure the two resistances in the L Pad and replace with a pair of high quality resistors?
    Someone here may know if a 6 ohm version exists anywhere.


    ... and yes I imagine you could replace it with fixed resistors (of sufficient power rating).

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