portable full range speaker with passive radiator

[zdanielz]

hi,

2 month ago I built a portable bluetooth speaker with 2 - 4" full range speaker..
the speaker was great but I didn't had enough bass.

so im thinking to add 2 passive radiators.

also I want to know if it will work better with mid drivers.

this is my speakers - Dayton Audio RS100-4 4" Reference Full-Range Driver 4 Ohm

this is the passive radiators that I'm thinking to buy - Dayton Audio ND105-PR 4" Aluminum Cone Passive Radiator

thanks!!

 

[18Hurts]

The rule for passive radiators is it should have twice the Xmax of the active driver

Your FR has 4mm of Xmax while the 4" PR has 6mm of Xmax--not enough!

This one will work

Dayton Audio ND140-PR 5-1/4" Aluminum Cone Passive Radiator

The 5.25" PR has more surface area so won't need to move as far--and it has 9mm of Xmax so won't be damaged even if you crank that 4" full range past max.

 

[planet10]

A PR is a substitute for a vent — usually used when the size of the vent becomes unmanagle for the box size. So your driver needs to be suitable for a BR to start with. What driver dis you use? How big is your box?

dave

 

[Nenola]

Do you have the drivers in sealed or reflex enclosure? I would start from figuring out the optimal box for those. Like planet10 said, PR is a substitute for a vent, they don't add bass or anything if compared to reflex enclosure.

And if you compare DIY speakers with commercial products, the commercial ones often have some DSP and other tricks to make them sound "better", at least more bass-heavy.