Add subwoofer to powered bookshelf speakers?

[rdy23]

Hi

I recently got edifier r1280t speakers and connect my phone to them via Bluetooth receiver which connects to speakers by 3.5 to RCA. The Bass seems a little on the lower end.

Is there anyways I can add a subwoofer to the mix?

Any subwoofer recommendations?

 

[jsmithepa]

It maybe more convinient and cheaper? to buy a new set with built-in sub.

But OK, if you insist, u do it this way:

BT receiver -----(stereo)----->SUB-------->L+R.

Powered SUB must have the following features: Unpowered (RCA) jacks to L+R, Crossover knob, Gain knob (for sub only), must be able to take in stereo signal.


In the per-chance that your current L+R have a sub out jack, any sub then will do, for flexibility can take stereo or mono signal, may need a crossover, and a gain knob, if sub gain knob not present on L+R.

 

[rdy23]

Ahhhh. I never realized sub could have L+R outs. That would be awesome. Thanks a lot.

 

[rdy23]

Gonna Check on significance of gain and crossover knob

 

[jsmithepa]

Sub Gain = because u want to be able to adjust sub loudness against L+R.
Crossover = because you only want to send low frequencies to the sub.

 

[americanaudiophile]

Most subs don't have line level outputs and unless the BT receiver has a volume control you will need one to adjust both the sat/sub volumes with one control.
You could use one of these
https/www.amazon.com/rolls-SX45-Tiny-Stereo-Crossover/dp/B00102VWJK
which is the perfect solution but would cost as much as the Edifiers.
Or you could get a passive line level volume control.
https/www.crutchfield.com/p_142RLC/EFX-Remote-Level-Control.html?tp=3091&awkw=133761554425&awat=pla&awnw=g&awcr=70489238545&awdv=c&awug=9004452&gclid=EAIaIQobChMIrc_N3dK93AIVgo2zCh2flQDwEAQYASABEgJwR_D_BwE
whose input would go to the BT receiver. You would split the output and connect both the sats and subs.