Boulder Amplifiers custom black 2150s are moving to the technician's bench where Ken will test them for three days. Every parameter will be examined, from their distortion levels to their thermal shut down points and everything in between. Most electronic parts failures occur within 48 hours of initial use, so they will also be "burned in" for 48 hours to try as much as possible to eliminate the chance that any failures will occur once you get them home.
Once they're done on the test bench, Boulder Amplifiers custom black 2150s head to the sound room where they're listened to in order to be sure that the measured specs match the audible performance. Various and different kinds of music will be used before the paperwork is signed off to indicate that the amps meet Boulder expectations.
This isn't unique to just the big or custom pieces: every product they produce gets auditioned like this before it leaves the factory and sent off to its new home.
And last step. Boulder Amplifiers custom black 2150s move to the shipping department. Each amp will be wrapped in a foam material specially made. It's a soft foam on the inside (so that the bead-blasted and anodized finish on the amp is protected and not harmed) with a layer of durable plastic bonded to the other side. The plastic layer prevents the heavy amps from rubbing through the foam layer during shipping, keeps the tight fitting packing materials from tearing the foam wrap, and allows the packing tape to be removed without damaging the foam wrap.
The amps are then packed with their accessory kits (power cord, owner's manual, any other accessories) and the top of the crate is then screwed down and sealed.