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Tweeter Hiss on Markbass CMD1020p

Discussion in 'Amps and Cabs [BG]' started by Accostingwalrus, Nov 26, 2018.

  1. Hey fam, I have a Markbass CMD1020p combo amp. Its a 2x10 with a piezo tweeter. There is a background hum/hiss that i believe is coming from the tweeter. If i turn down the high end the hiss goes away so its definitely tweeter. And its there when the amp is on but not plugged into a bass. The amp sounds soooooo good, the tone is so warm and when i turn up the volume the bass hugs my soul. But the background hiss gets a little annoying, which is why im asking if there is anyway to reduce the noise without turning down the high end (love me some slaps)
  2. Rick James

    Rick James Inactive

    Feb 24, 2007
    New Jersey
    Tweeters can't create hiss, they can only reproduce the hiss created by the amp.
    AlexanderB likes this.
  3. That was a real fault of those combos. Those LeSon piezo tweeters don't really do anything useful to the sound. They start so high, far higher than any really useful low-treble that they just end up hissing and occasionally reproducing string squeak. They should have put compression drivers in those. My NY121 barely ever registers any sound out of its piezo tweeter.

    There's no harm in dialling back the treble to stop that hiss. You might want to also look at your signal chain. Your bass might be hissing if it's active. My TRB1005j hisses quite a bit if I boost the onboard treble. My Laklands don't hiss nearly as much.
  4. Russell L

    Russell L

    Mar 5, 2011
    Cayce, SC
    Ditto. My CMD 121H combo has a compression driver. Never a hiss. Such a good sounding combo overall, too.
  5. Jeff Scott

    Jeff Scott Rickenbacker guru..........

    Apr 11, 2006
    Disconnect the tweeter; that always makes bass amps sound better (to me). I still have the tweeter connected on my Minimark and I don't recall there being too much (any, really) hiss from it.
  6. Marko 1

    Marko 1

    Mar 9, 2009
    N.E. Ohio
    I can turn mine (compression drivers) down or off, which I do.
    Blew the one on my GK 212MBE (thought the switch was off, loud band), so that's out. :D
  7. So i put a mr clean scrubby thing over the tweeter and it blocked out all of the hiss! And it didnt really affect the tone as much as i thought it would
    seamonkey and JxBass like this.
  8. Jeff Scott

    Jeff Scott Rickenbacker guru..........

    Apr 11, 2006
    Now, you have a nice, clean tone. :D
    eriky4003 likes this.
  9. Crazzle


    Oct 17, 2018
    Here's my solution... Girlfriend's crocheted "granny squares" : )
    seamonkey likes this.
  10. What all the Markbass hiss complainers/whiners neglect to mention is you need be ear level right in front of tweeter. If you stand up or move slightly away you can't hear it. And of course when you actually play it's moot.

    A lot of electronics have some high frequency noise home or Pro and if you have a teeter that has good output in that range you will hear some noise with ear up to tweeter in quiet room; So What!
    We all know tweeters don't hiss?

    Some tweeters with less output/response or Compression Horns [no real highs] may mask electronics noise/hiss somewhat.

    If the Amp/Speaker combination sounds great when using it that's what counts and in this instance The Markbass amps/Speakers are quality sounding products and competitive with anything in there price range. There are other great amps out there maybe with technically better tweeters[to me many [not all] horns are not better; harsh and hard if not cut a lot]

    I don't and never have heard any negative effects of P tweeter on overall sound in Markbass Cabinets.
    I do notice with tone/EQ set for Slap and Pop you get the 'Ping' sound with Markbass when you pull, I have heard a lot RnB and Jazz players use that tone. Can get more conventional 'Pop' bring down Highs to flat and boost upper midrange [800 on Markbass.]
    Last edited: Jul 5, 2020
    SJan3 and TN WOODMAN like this.
  11. PS; If knowing your tweeter 'Hisses' is unbearable and annoy's you to no end. This may be best solution [easiest also]

    "Unscrew the speaker and you get access to the 'crossover' such as it is. The first set of wires are labelled 'input'. Pull the spades off the connectors and attach them to the speaker and put the wires from the speaker on to the connectors on the crossover. It isolates the tweeter and the crossover and you get the amps full output to the speaker."

    Then you will have A CMD 121, NY 121, CMD 102 Etc. Jeff Berlin Model:)
  12. BassmanPaul

    BassmanPaul Inactive

    Wow! You must be stuck at home with nothing to do 'cos of the Pandemic!!

    The OP was last here on December 23 2019. The poster before you was last here on April 01 2020.

    Zombie alert!
  13. :) Nah to pandemic homebody but Bored possibly. Just wanted a space/spot for those whom are bombarded with this Hissing tweeter stuff to have an alternative Point of View when Goggling. [Most recent I could find]

    And give them a chance to see 'The Forest for the Tree's
    BassmanPaul and SJan3 like this.
  14. BassmanPaul

    BassmanPaul Inactive

    Being a tad older 'n' you I don't hear any hiss unless I have my hearing aids on. :(

    As you get older you'll hear less and less hiss. It's part of the damn misnamed 'Golden Years.' Rusty years would have been better! :rollno:

    All high gain electronics, tube or transistor, produce hiss. it's the price we pay for that gain. I get zero hiss through the tweeters in my Acme B2s but then again I designed the tube preamp with just enough gain to drive my power amp fully.
    SJan3 and NEBADON2000 like this.
  15. Also, it's pretty easy to damage those Le Son tweeters. I've seen many NY121s with dead Piezo Tweeters. They don't really fizzle out and smoke, they just stop working completely, and because they're isolated and Piezo, they don't seem to affect the load on the amplifier...

    It didn't help that the amplifiers commonly feed those speakers had a treble control centred around 10k. That's incredibly high and invites misuse to the point where the amp will hiss gleefully into those piezos.

    I used to see NY121s hit the used market and many had perfectly fine woofers and blown tweeters. Luckily mine still works - and I don't find it hissy - it's just really harsh and really don't positively contribute to the sound of the cabinet. Same thing with the Markbass tweeter "add-on" they had originally... It was basically a piezo tweeter in a box the size of a Rubik's Cube.
  16. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

    Mar 6, 2021

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