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Am I the only one having problems with MarkBass tweeters?

Discussion in 'Amps and Cabs [BG]' started by Agito, Apr 25, 2010.


  1. zzaass

    zzaass

    Jan 19, 2010

    I just disconnected the one in my 121p (before it got the chance to blow) first impression is that the amp is a little less hissy. The tweeter is a Le Son Model Lj and has a three cornered design
     
  2. billfitzmaurice

    billfitzmaurice Commercial User

    Sep 15, 2004
    New Hampshire
    Owner, Bill Fitzmaurice Loudspeaker Design
    If it uses a single piezo tweeter it's a given that they will blow. Piezos, unlike dynamic tweeters, are voltage limited, not power limited. That limit is roughly 25 volts, and even a 50 watt amp with moderate distortion will deliver that much to a tweeter. The only reliable method to use piezos is in pairs, series wired, which doubles their voltage limit.
     
  3. Don Sibley

    Don Sibley

    Jun 27, 2005
    Fort Worth, TX
    Problem is finding one that will fit in the tiny little space Markbass leaves for the tweeter in that combo. I gave up and returned the combo to GC.

    I wanted to change mine out because that tweeter is a hideous piece of hammered dog crap. If it is silent after it blows. I would call it a blessing.
     
  4. I surely don't recommend any of the Markbass combo amps. I again have not heard of a ton of tweeter failures, but that cheap sounding piezo tweeter with no attenuator is just a sin against nature, and is a classic example of why some people 'don't like tweeters'. If that is the only execution of a tweeter one has heard, I wouldn't like tweeters either. It is also one of the reasons that some post that 'Markbass amps are noisy' (which they are not). However, if you have a piezo tweeter that has no attenuator, it will amplify the normal background hiss of any amp to levels that many would find annoying.

    I again STRONGLY recommend to the OP that he puts a replacement tweeter from Markbass in there, and then sell those cabs and move to something else.

    MB, IMO, makes some of the findest sounding heads out there, and the cabs with the compression horns sound quite nice. The little combo cabs are IMO not of the same sound quality and design as the rest of their product line.
     
  5. Don Sibley

    Don Sibley

    Jun 27, 2005
    Fort Worth, TX

    Agreed. :smug:
     
  6. I blew the tweeter in my CMD-112P tonight. It happened after I yanked the cord out of my bass with the amp still on. I knew better but wasnt thinking. Anyway, I am about to disconnect it until i find a replacement. What tweeter do you guyes recommend?
     
  7. Billnc

    Billnc

    Aug 6, 2009
    Charlotte NC
    I don't like tweeters on bass. I don't like Piezo tweeters in any application. I think my better cabs have all had Foster horns. I've rarely used horns as they only seem to add unwanted freqs. Fosters seem to work well.
     
  8. billfitzmaurice

    billfitzmaurice Commercial User

    Sep 15, 2004
    New Hampshire
    Owner, Bill Fitzmaurice Loudspeaker Design
    Fosters are only fair to middling; the main reason they're used so much is that they're inexpensive. I agree that tweeters for bass are a generally bad idea, midrange drivers work much better. If one must use a tweeter then a high quality tweeter capable of running to 2.5kHz would be best, but those cost about $10 more than what Fosters do, and the crossover components would cost perhaps $5 more than those for a Foster do, and so...:rollno:
     
  9. fishstix

    fishstix

    Feb 28, 2006
    Wisconsin
    The tweeter in my 121p blew a while back and it's past the warranty period. I chose to open it up and bypass the crossover and just use the 12. I think it sounds much better this way, kind of like a smaller version of the Jeff Berlin model. It doesn't have the sparkling highs for slapping but it never was great for that as it really started to compress with the small enclosure. It has a more "old school" tone to it now and actually sounds pretty cool for slapping with a p bass still, IMO. Without the tweeter it seems to handle a lot more power and works great for rehearsals (which was one of the main things I bought it for).
    I think this cab would have been much better from the get go if they left the tweeter off it. However, I paired it with the matching extension cab a while back and used the attenuator on it to dial in just a smidgen of the tweeter and that was killer. The two together were pretty cool. Too pricy for the results IMO though.
    With that said, if you're out of warranty and have your tweeter go, try bypassing the crossover and just using the 12 before getting rid of it. You may be happy with the results. JM .02
     
  10. I have put piezo's in my cabs way before they were stock items(I think).
    I have never blown one and I play pretty hard and dig in.

    I set my Markbass piezos about half way...never had an issue with them.

    I know they are not the best tweeter for bass(or metal:eek: ) but they work for me.
     
  11. For now, I have juts unplugged the tweeter in my 121P and it sounds fine. I run mine with a 151 cab that has a tweeter anyway but, I would like to replace the tweeter in the 121P at some point. I dont really blame Markbass for the failure as it was my own stupididy that caused it to fail. This amp is 3 years old and has performed flawlessly until this issue. If anyone has a link to a good replacement tweeter, please post or forward it to me. Thanks!
     
  12. jgroh

    jgroh Supporting Member

    Sep 14, 2007
    Pennsylvania
    As others have said, the combos are not my favorite, but I love my LMII. Ive gigged the hell out of that thing and its still working great. I get so much love from my bandmates and people in the audience over that thing its not funny.
     
  13. Larry Cotten

    Larry Cotten

    Sep 9, 2009
    Denver
    I left my 4-10 Mark Bass cab for warranty repair and was told the tweeter was bad. After a month I picked it up and did one gig and now it's doing the same thing (buzz sound). Next week I'll take it back once again...I'm not too happy with MB at the moment.

     
  14. hnmusac

    hnmusac

    Dec 10, 2011
    HI, I have posted another forum about lack of presence playing with the band with my MM Sterling.

    I think the piezo tweeter from my NY151 is gone. I tried to listen close to the tweeter and playing high notes, but no sound is coming out. So I think it is busted.
     
  15. Russell L

    Russell L

    Mar 5, 2011
    Cayce, SC
    I don't know ifthe tweet in my traveler 151P cab has ever worked. I've certainly never heard it. It's never changed the tone, no matter where I set the knob. It also doesn't hiss, rattle, or do anything like what I hear folks say that one does when it's gone, or going, bad. Kind of a mystery to me. My hearing is bad, but I've had bandmates listen, and they can't tell either.

    QUESTION: if it is bad, and if it makes no noise, can I just play on? Is there anything wrong with playing with a bad tweeter if it doesn't affect the sound? Does it affect the ohmage? Does disconnecting it change the ohmage? And what is involved in disconnecting it?
     
  16. hnmusac

    hnmusac

    Dec 10, 2011
    I just plugged normal P10 cable and the tweeter started to hiss, and the attenuator is now working.

    I am wondering why tweeter doesnt work with speakon cable???
     
  17. Russell L

    Russell L

    Mar 5, 2011
    Cayce, SC
    Again, lemme ask, can I play with the tweeter blown (if it is)? Does it hurt anything?
     
  18. fishstix

    fishstix

    Feb 28, 2006
    Wisconsin
    I haven't run into any problems.
     
  19. Russell L

    Russell L

    Mar 5, 2011
    Cayce, SC
    That's good to hear. Anyone else?
     
  20. You have one of the MB cabs that uses a piezo tweeter. As far as I know, piezo's don't even typically use a crossover, so if yours is blown, your driver would still run full range and no harm will be done to anything.

    The way to tell if the tweeter is working or not (since some basses don't even put out frequencies as high as those piezos 'start point') is to unplug your bass (so you in no way risk hurting your ears), turn you VLE filter all the way off, turn your treble control all the way up, and crank both the input gain and master. That extreme setting will pump out all kinds of hiss above 10k, and you should hear that screaming out of that little piezo. If you don't, it is trashed.
     

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