Bass Café
Giovani Battista Rogeri Basses
(Italian model, $4950)
Wan-Bernadel Deluxe Basses
(French model, $4950)
Basses Under $3,000: Thompson Plywoods, Hybrids, Emile Gillet, starting at $1,485
Bass Bows
Upright Bass Strings
Bass Sheet Music, Methods
& Etude Books
Bass CD / DVDs
Bass Accessories (Rosin, Pickups, Metronomes, Tuners, Amps etc...)
Bass Covers & Bow Cases
Bass Flight Cases
Bass Teacher Directory
Violin, Viola & Cello Cases
Gift Certificates
About Us
Contact Us
New Videos
Email Newsletter icon, E-mail Newsletter icon, Email List icon, E-mail List icon Join Email List
For Email Newsletters you can trust

Gewa Double Bass HumidifersGewa Bass Dampit

These are the new Gewa double bass humidifiers used to humidify the interior body of a bass.  In some super dry climates (like where we are in the Phoenix area), we can and do use these all year 'round.  Most though that live in more seasonal areas will only have to worry about super dry times during the winter when the air is cold and the home heater dries and heats the air inside.  While violins and cellos shrink and contract in similar ways and percentage ratios, when a bass contracts, 2% can mean 1/4" or even more.  Adding humidity to the bass will help minimize the change so that the bass will not crack!  A 'weather crack' (about 95% of bass cracks!) is caused when the natural moisture content in the wood is lost during the dry months and then causes it to contract and shink.  The back, usually is the most aggressive part of the bass in contraction (maple!) and will shink more than the top.  Again, if the seams to do not 'pop' open (between ribs and back, or top) then the back pulls the ribs, which still glued to the top, will then pull apart the softer spruce wood top.  So the pressure point or 'release' point...is your top! Also, here is when flat back style basses can crack against the support bracing in the bass.

How these work and how to use them.  Both the Dampit and Gewa style of humidifiers have been around for at least 4 decades! They are made from a latex rubber tube, with a super absorbant sponge inside that acts as a 'wick" allowing the moisture to evaporate into the (un-varnished) body interior, by simply hanging inside from the f-holes.  At the bottom 2 inches of the tube, there are no holes.  This is to keep excess water from dripping into the bass and at the same time, feed that sponge wick and evaporate into the bass.  While basses have a nice protective varnish on their exterior that has a protective seal, inside the bass is bare wood and will absorb that moisture.

Buy your Bass Humidifers here:



When filling the Dampit with water, be sure not to over fill them.  Needless to say, we never want them to drip inside the bass. The best way to use these is to simply hold them under the faucet, then squeeze all the extra water out.  If you are not used to using them, try hanging them on a bathroom towell rack and then come back in an hour or two to see if they are dripping or not.  You want to hear that "Squishy" sound at the bottom of the tube, but not see dripping or water to come out of it too easily when pinched.  A little goes a long way, especially if you use 4, which is the most effective way.

What works best.  We have found that using 4 moderately moistened (safely) Gewa Humidifiers in your bass and storing it with the cover on and zipped up, creates an optimal way for the bass to fully absolb the much needed moisture.  So, after a practice or playing session, when you are finished with the bass for the day, hang the tubes in, then put the cover on.  This creates a safe, not overly wet 'bass humidor'.  Without the cover, the nice humid air will just evaporate out through the f-holes.  The cover makes a significant difference this way.

There are other ways to deal with humidity.  See our other dedicated humidity page where we explain some other ways to help your bass along in the dry times of year.