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Thread: 8 ohm for 30 ohm swap

  1. #1
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 944
    I'm Chris.

    Default 8 ohm for 30 ohm swap

    I have a two way speaker with 8 ohm mid and 8 ohm bass driver. If I then exchange the bass driver for a 30 ohm bass driver, will it be louder and an easier loud for my 2w triode amp. Appropriate changes will be made to component values in the low pass filter.
    Thanks
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  2. #2
    Join Date: May 2008

    Location: Surrey

    Posts: 6,571
    I'm Rob.

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    I would say that the power output would be roughly a quarter of that into 8ohms.

    This may help.
    https://geoffthegreygeek.com/speaker...plifier-power/
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  3. #3
    Join Date: Jan 2008

    Location: Norfolk, UK

    Posts: 4,768
    I'm Rob.

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    What 8ohm bass driver so you currently have? Itís a very common impedance for a bass driver and thereís a plethora of drivers out there that may work as a replacement.

  4. #4
    Join Date: Mar 2017

    Location: Seaford UK

    Posts: 1,621
    I'm Dennis.

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    Very much depends on the driver sensitivity. The quoted impedances are only nominal anyway, in reality they are all over the place. It will take less current (nominally 1/4 of previous), and so be an easier load form that point of view, and if it is more sensitive, you could have a win/win. Depends on driver design, magnets, gap, coil density in gap, weight of diaphragm.

  5. #5
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 944
    I'm Chris.

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    Quote Originally Posted by Filterlab View Post
    What 8ohm bass driver so you currently have? Itís a very common impedance for a bass driver and thereís a plethora of drivers out there that may work as a replacement.
    I have the Emminence Alphas and they are just too quiet compared to my Seas Exotic W8s
    SW1X Universal Music Server UMS I Signature with Power Supply Unit PSU I Signature
    SW1X USB II
    SW1X DAC III Special
    SW1X Open Baffle Speakers containing both vintage and modern alnico drivers and paper cones. All silver wired and crossover-less where possible - 4" vintage Siemens Klangfilm tweeters, 8" SEAS X2-08 EXOTIC W8 midrange drivers and vintage 15" Altec VOTT 416 bass drivers
    Hi fi Collective twin mono ladder stepped attenuator, with Charcroft Z-foil and silver wired.
    DRD 45 single ended, 45 triode, monoblocks,
    Silver mains cables, interconnects and speaker cables by SW1X

  6. #6
    Join Date: Dec 2017

    Location: limerick

    Posts: 52
    I'm charles.

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    The output transformer will reflect that impedance back to the output valve according to its turns ratio and it will not perform as intended.

    What 30 ohm drivers do you have and at what sensitivity? I assume you have Emminence Alpha A's which are about 96dB. The only way to get power into a 30 ohm speaker would be to get Jack Elliano at Electraprint to custom wind you a pair of new transformers.

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