Can you help me cinch up my bluetooth speaker design?

This is yet another antique radio to bluetooth speaker conversion. My dad passed away recently. He has a collection of old electronics that included an old Philco radio. The insides aren't salvageable, alas, so it's a candidate for conversion. I've got a few questions regarding the build (which will be my first speaker build ever).

The interior dimensions are roughly 13.5 x 7.5 x 8". It's got a single 5.5" oval opening in the front. I'm planning to build a cabinet that will go inside of the radio body, and to go mono rather than stereo. Here are my questions:
  1. Given the cabinet size, would you go with a single full range speaker or a combination of speakers?
  2. Based on your answer to #1, what bluetooth amp board would you recommend?
  3. I've just learned about the existence and purpose of passive radiators. If going with multiple speakers rather than a single full range, does each speaker get its own isolated space in the cabinet and its own PR or can one PR work with multiple speakers in the same cabinet?
  4. I'd like to keep the original knobs that were on the radio and in their original locations, but of course their purposes will change. Of course one will be volume, but if you were me, what would you do with the others? Treble & bass? Crossover frequency & bass volume? Something else? (I have 4 knobs total)
Thanks!
 
Pics, please?
There's a fiber mesh that goes behind the oval opening in the front, and of course there's a vented back that I've removed. I still have the internals, though it looks like some of the tubes are burned out.

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Kind of looks like an oval car radio speaker might fit inside. Note exactly enough space to develop serious bass. Maybe that and some damping material. However damping material might not be good for heat flow of active electronics. Besides, looks like it would have to be mono. What would you do with stereo sources?
 
Well, if you ( manage to) preserve the original Power amp, that would be half (1/3) of the work, although I would always change and old speaker for a more performing One.
The same goes for all the parts of a system, so my First sentence Is not-true.
But, well, tubes...nobody has a tube BT!

The idea of making a sub enclosure Is good: every function must be separated...
 
Pics, please?
I'd like to keep the original knobs that were on the radio and in their original locations, but of course their purposes will change. Of course one will be volume, but if you were me, what would you do with the others? Treble & bass? Crossover frequency & bass volume? Something else? (I have 4 knobs total)
The functions are skip/previous, volume up/down, source select and sby/on
 
depends what the final choice of amplifier is. for push buttons likely could find pots with dual function with rotary and button.
also power on/off switch on one as well.

might be possible still get stereo with side by side drivers that fit in current cutout.
even passive radiators on back for bass.
 
Hi, I have build myself a bluetooth portable speaker. Using some old Scan Speak tweeters and Focal woofers.
In testing some crossover, sounds realy good. 2+20W, using 12V power now ( battery later ).

Frank
 

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