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Midwest Audio Fest

It’s that time audio enthusiasts!

Registration for the 2019 Speaker Design Competition is now open! Visit midwestaudiofest.com for details and to list your speaker project.
We are excited to see all returning participants, and look forward to meeting some new designers this year, as well!

Be sure your plans include a visit to the Parts Express Tent Sale for the lowest prices of the year, and the Audio Swap Meet where you can buy and trade with other audio fans.

We hope to see you this summer!

Vivian and Jill
2 of 2 < >

Midwest Audio Fest

It’s that time audio enthusiasts! Registration for the 2019 Speaker Design Competition is now open! Visit midwestaudiofest.com for details and to list your speaker project. We are excited to see all returning participants, and look forward to meeting some new designers this year, as well! Be sure your plans include a visit to the Parts Express Tent Sale for the lowest prices of the year, and the Audio Swap Meet where you can buy and trade with other audio fans. We hope to see you this summer! Vivian and Jill
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Best Parts Express xovers/filters for a workshop sound system?

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  • Best Parts Express xovers/filters for a workshop sound system?

    Cheap sound setup for my home workshop, fed from my laptop. The game is to do it cheaply!

    Currently, I have these (new) speakers from this Samsung home theater system -
    https://smile.amazon.com/dp/B00WZOE2..._t1_B018IN2STQ.

    I use my laptop through this little Pyle ~2x15 (really) amp -
    https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1.

    Out of the amp, left and right each go to one of the 3-ohm "front" speakers and one of the 3-ohm "surround" speakers in series; 6 ohm load total per side (amp wants 8 ohms).

    Sounds great - but - I'd like to use the mono un-powered sub - unknown specs.

    My thought is this - "bass-blockers" on the Pyle speaker-level outputs before going to my speaker pairs - the product here at 6 ohms would give a cut at ~225 Hz
    https://www.parts-express.com/speake...50-hz--266-200.

    Then use a low-pass at ~250 on each side, paralleled to the amps's output with the bass-blocked sides going to the small speakers - or maybe these 500 Hz versions? too high?
    https://www.parts-express.com/dayton...tave--260-1760

    Then - build the "Wye" circuit to combine both <250Hz channels into one, using the 10-ohn 10 Watt resistors here
    https://www.parts-express.com/jantze...istor--255-954

    And then feed the mono sub with the single output from that "Wye" circuit.

    Would it work?

    What if i do the "Wye" right out of the amp, and use a single low pass

    Or, I see the specials on the speaker wire terminal plates; at 550 high pass and 550 low pass - but 550 seems to high to pass to the sub.
    So - what's a cheap way to do this?

    Thanks a million!

    Forrest

  • #2
    IMO, you're going about this all wrong. Use the ".1" sub channel on cheap TPA3116 2.1 amp module (and 24V PS) and feed it the same signal as the pyle is getting from the laptop (Y splitter). The amp's sub channel will have a ~100 hz lowpass filter built in. And the volume and/or sub controls on the amp will allow you balance the sound with the L-R channels on the Pyle. With the 24 V PS you'll get ~70 W rms (clean) into the sub. If you can lay you hands on an old laptop supply for free this will cost way less than massaging the power oututs of the Pyle. A laptop supply circa 19 V will get you 40+ W rms into the TB.

    Click image for larger version

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    • #3
      Hey - I like it - let me go through it - thanks! Plenty of 24V power supplies from work - I do commercial industrial LED lighting R&D

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      • #4
        Trying to understand this one - https://smile.amazon.com/AOSHIKE-Sub...ct_top?ie=UTF8 - does it take a stereo input and combine them, then low pass and amplify to a mono sub output?
        Thanks -

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        • #5
          Originally posted by McDesign View Post
          Trying to understand this one - https://smile.amazon.com/AOSHIKE-Sub...ct_top?ie=UTF8 - does it take a stereo input and combine them, then low pass and amplify to a mono sub output?
          Thanks -
          It looks like that is correct. But that description is pretty....jumbled, to put it kindly. English translation issues and I'm not sure they really know which product they have for sale here. It says "dual channel output", but there's only one set of output connections!
          Co-conspirator in the development of the "CR Gnarly Fidelity Reduction Unit" - Registered Trademark, Patent Pending.

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          • #6
            Originally posted by McDesign View Post
            Trying to understand this one - https://smile.amazon.com/AOSHIKE-Sub...ct_top?ie=UTF8 - does it take a stereo input and combine them, then low pass and amplify to a mono sub output?
            Thanks -
            That is what it appears to be. After combing the L-R signals into a mono sub signal, the on-board op-amp likely implements the LP pass filter and adds some signal gain for the sub. But I haven't analysed this board as I have others so YMMV. Look for a 24V PS with 3+ amps.

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            • #7
              Wow - what a great site to get useful responses so quickly - thanks to all!
              Forrest in Atlanta

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              • #8
                So here's where I am now - twin stereo plug out of the laptop docking station; one to the Pyle driving (4) 3-ohm home theater cubes, and a bridged tweeter from some old Panasonic bookshelf speakers from the '70s, probably!
                Other output goes to the filter and amp for an old Altec-Lansing computer speaker set, without using the left and right speakers - this is the side I want to replace.

                Forrest in Atlanta

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