Home › Forums › Help/Technical Questions › Portable V256 Vocoder – Amp Speaker Advice for Pedal Output

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  • January 19, 2024 at 7:46 am #207965
    insultcomicdog
    Participant

    I have an Electro Harmonix v256 pedal I would like to use in a backpack (portable). I picked up a Tip Negative Sleeve Positive USB to 9V Power Supply Cable and a USB power bank which powers the pedal fine. I can connect this setup to a powered guitar amp thats plugged into wall outlet and it sounds fine.

    I got a 80W 100W TPA3116D2 Mono Amplifier Board Class DC 12V-26V Digital Audio Power Amplifier to amplify the pedal output.

    This is the amp: https://a.aliexpress.com/_mMqENH6

    I picked up a 1/4 jack to connect the output of pedal to amp. I was going to use 24 awg speaker wire (red to center pin of jack, black to outer shield of jack).

    These are the speakers (will be just using one):

    Pyle PL42BL 4-Inch 180W Two-Way Speakers Pair https://a.co/d/cvx6EiO

    I’m cautious about the amp and speaker portion of circuit. Since the pedal is the most pricey part of my project I don’t want to blow it up and let out blue smoke. Does this setup work? Anything I should change? Is there an alternative budget friendly non DIY amp/ speaker can I use with this pedal that is portable?

    January 20, 2024 at 8:08 am #208100
    EHX STAFF
    Keymaster

    Contact the techs on Monday at info@ehx.com

    Going from the pedal to the amp you should use shielded cable or it may be noisy.
    Going from the amp to the speakers use the speaker wire.

    February 9, 2024 at 8:54 am #209000
    insultcomicdog
    Participant

    Update.

    I switched my amp to this 9-20V 20W TDA2030A Class AB Mono Power Audio Amplifier.

    https://a.aliexpress.com/_m0cp1BG

    And the speaker is now:

    Tang Band W2-800SL 2″ Aluminum/Mg Full Range Speaker Driver

    https://www.parts-express.com/Tang-Band-W2-800SL-2-Aluminum-Mg-Full-Range-Speaker-Driver-264-807?quantity=1

    I’m using a 1/4 jack shielded patch cable to connect v256 pedal output to amp with a 3.5 mm mono jack to connect to the amp.

    When I tested setup (no blue smoke was released!), but the sound volume is quite low. For example if I connect an iPod to this amp and speaker I can fill the whole room with sound, but using the v256 pedal I barely can fill my desk with sound.

    Is there anything else I can do to increase the volume besides getting a more powerful amp? Am I using the wrong cabling/adaptor to ouput sound to amp?

    February 9, 2024 at 10:58 am #209005
    EHX STAFF
    Keymaster

    Your ipod is meant to drive headphones and has a much higher output than the pedal, which is designed to drive a pre-amp.
    Sound like you will need a small preamp before the power amp.

    February 9, 2024 at 1:16 pm #209006
    insultcomicdog
    Participant

    Thanks for the tip about a pre-amp. I have a headphone amp kit I build a while back that I’m going to try:

    https://www.worthpoint.com/worthopedia/banzai-v2-cmoy-headphone-amplifier-173543067

    My main concern is blowing up the pedal, power amp or speaker because of incompatibility.

    My plan is the output the pedal to headphone amp then output headphone amp to power amp (9-20V 20W TDA2030A Class AB Mono Power Audio Amplifier). I will report back with my results.

    Is there a portable pre amp you would recommend to use with the power amp and speaker listed above?

    February 11, 2024 at 11:50 am #209008
    EHX STAFF
    Keymaster

    You cant hurt the pedal as long as you dont drive the power amp into the 256.
    Check on Ali for a preamp. They are cheap and some could be used as a mixer to add other things in the mix.

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