Aguilar DB750 fan noise and replacement

Discussion in 'Amps and Cabs [BG]' started by stockplus, Apr 14, 2022.

  1. stockplus

    stockplus

    Aug 11, 2015
    Eugene, OR
    Hi,

    So I just picked up this DB750 and it sounds great. The fan noise (IMHO) is another story. I can see this being no big deal when playing live with a band - and indeed that seems to be the consensus on here. Unfortunately, I'm usually playing in the living room semi-quietly these days.

    Just out of curiosity I looked into replacing the fans. I haven't cracked the case open yet but I read in another thread here that this is the culprit:

    3110KL-05W-B30-D00

    31.8 CFM (0.890m³/min)
    0.106 in H2O (26.4 Pa)
    2700 RPM
    28.0dB

    I looked around on Mouser and Digi-Key and found some comparable fans; several of them are quieter (down to 17-ish dB) but of course with lower CFM and static pressure.

    My question is - is it safe to replace these fans with something that's in the 23 CFM, 1850 RPM range? There are some Sanyo Denki fans with those specs rated for 20dB - like this guy. Seems like a pair of these would be substantially quieter, but will I cook the amp using these lower-volume fans?

    Edit: I should add that I am definitely not going to ever be driving a 2 Ohm stack of speakers at arena volumes. Might be powering a modest 8 or 4 Ohm load at quiet suburban levels, though.

    Thanks!
     
    Last edited: Apr 14, 2022
  2. abarson

    abarson

    Nov 6, 2003
    Santa Cruz
    I would not make any assumptions about what fan is in there.
    Either open it up and work off the specific model or contact Aguilar for info and recommendations.
     
  3. Wasnex

    Wasnex

    Dec 25, 2011
    I have seen multiple DB750s go down. I can't say it was due to overheating, but I would not suggest decreasing the air flow or pressure of the fan.
     
    rodl2005 and agedhorse like this.
  4. stockplus

    stockplus

    Aug 11, 2015
    Eugene, OR
    I totally agree. First thing I did was get an email out to Aguilar (no reply yet). I haven't had a chance to pop the cover off the take a look at the fans in person. I was just getting antsy so I figured I would ask the community. :thumbsup:

     
  5. stockplus

    stockplus

    Aug 11, 2015
    Eugene, OR
    Point well taken - thank you!

     
    Wasnex likes this.
  6. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
    I would not change the fan without verifying from the manufacturer what's really needed.

    Going from memory, I recall there being 2 fans in those amps, and that they may in fact be an odd voltage as well. There may be more than one version of the amp where the fans have changed as well.

    There's a lot of dissipation happening in the output stage, I wouldn't recommend derating the cooling system from what the designer intended. It will not be an inexpensive repair if you guess wrong.
     
    Wasnex likes this.
  7. stockplus

    stockplus

    Aug 11, 2015
    Eugene, OR
    Sage advice, thank you as always Mr. Field.

     
    agedhorse likes this.
  8. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
    You take your chances, note the disclaimer.