The Portable Hulk

The Portable Hulk


Project Category:
Portable Speakers

Project Level:

Project Time:
8-20 Hours

Project Cost:
$100 – $500

Project Description:
Portable, rechargeable, Bluetooth speaker system

Design Goals:
The primary design goal that I had was to make a portable Bluetooth speaker just to “see if I could do it”. Of course, I wanted the end result to sound better than any $40 speaker that can be bought at discount stores.

Driver Selection:
295-549, 295-417, 275-022

Enclosure Design:
At first, I was going to build a sealed design (and probably should have for the sake of size) but decided to add a passive radiator. I used two Dayton Audio GF180-4 6.5” woofers and the Dayton Audio DSA215 8” passive radiator tuned to approximately 40hz. Installed in approximately 2.5 cu ft.

Enclosure Assembly:
I may regret it, but I used some leftover shelving boards for the cabinet construction. Once I assembled the wood and completed cutouts, I took it to a local truck shop and had it coated with Line-X bed liner.

Crossover Design:
I purchased a ready-built 3,500 hz crossover that seems to work ok for these drivers.

Tips & Tricks:
Hone your soldering skills! Use plenty of glue on your wood joints.

I probably need to attenuate the tweeters slightly because they do seem to overtake the system, but I must say the for a first attempt, this thing ROCKS!

About the Designer:
Just a hobbyist that enjoys learning.

Project Parts List:

Dayton Audio DSA215-PR 8″ Designer Series Aluminum Cone Passive Radiator
Dayton Audio GF180-4 6-1/2″ Glass Fiber Cone Woofer 4 Ohm
Dayton Audio TD25F-4 1″ Soft Dome Tweeter 4 Ohm


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  1. 1
  2. 3
    Dan Still

    left a note liking the fact of a passive radiator being used and was wondering if it got posted and how do you keep the curious fingers away from your cones?

  3. 4

    @Dan Still, Sorry i havent responded…I didnt realize you had commented. Anyway, i should have used two passive radiators, not one! As for curious fingers, i dont have any of those around my house, however, you could easily install covers to protect the drivers, i just chose not to. I am now actually thinking about modifying this and taking the 8″ passive radiator out and installing a new 8″ subwoofer and change the amplifier out to a 2.1 version. 😀

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