Blast Box Bluetooth Speaker

Blast Box Bluetooth Speaker

Build log for my 5 driver 25000mAh battery powered bluetooth speaker kit from Parts Express.

Project links
2020 Posts

Blast Box Crossovers Complete

Used 2 perf boards and copious amounts of hot glue and assembled the two crossovers used by the Blast Box bluetooth speaker.

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Blast Box Electronics Assembly Complete

Installed the 25000 MAH 5 battery pack, amp and two crossovers into the assembled box

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Because of the COVID a memorial gathering me and some friends hold every summer was adjusted to be smaller and more socially distant, since we were camping more spread out outside the bluetooth speakers we had seemed inadequate. I wanted something that could be run of battery if necessary, did not require internet and had actually good bass when used outside. Even with some models costing $300-500 they still sounded pretty bad outside. Parts Express offers a number of different bluetooth speaker kits and the Blast Box seems to be designed to be the best sounding model in open areas.

My Upgrades

  • 2 Spring Loaded Side Handles
  • Upgraded to 21 Volt Battery pack from included 12 volt.
  • Black protective corners and aluminum angle for case

Bill Of Materials (BOM)

Part Qty Unit Cost Total Cost
Parts Express      
Blast Box 200 Watt Portable Bluetooth Speaker Kit 1 $250.00 $250.00
21V Output Power/26650 Battery Charger Bundle 1 $70.00 $70.00
2-Piece Grill for 6-1/2” Speaker Black 1 $5.00 $5.00
2-Piece Grill for 8” Speaker Black 1 $6.00 $6.00
4-Pack Rubber Cabinet Feet 1.7” Dia. x 0.75” H 1 $2.00 $2.00
White Perforated Large Hole Crossover Board Pair 3.5” x 5” 1 $4.00 $4.00
Penn-Elcom C1823K Metal Cabinet Corner Black 3 Leg 16 $0.60 $9.60
External Bluetooth Antenna Kit with 11.8” (300 mm) Cable 1 $5.00 $5.00
Reliable Hardware Company RH-5112BO-A Screws 1 $6.00 $6.00
ACE Hardware      
48” 1/2” Aluminum Angle 3 $7.00 $21.00
Matte Black Rustoleum Paint 1 $5.00 $5.00
TOTAL     $392.60