Cheap,speakers suitable for upgrading

Obvious upgrade candidates are the Celestion speakers that feature versions of the HF1300 tweeter. This tweeter has no output above around 13.5kHz, so each model would benefit from a supertweeter, as per B&W DM4 and Spendor/Rogers and IMF models.

This could be in a pod placed on top of the existing speaker and connected to the existing terminals on the speaker in question.

As the HF1300 has a near vertical cut-off just above 13kHz, the supertweeter may probably be best introduced via a steep filter, say third order or higher.

I thought I would try ripping the stuffing out of my speakers as recommended by some.

Well I can assure you I re-stuffed them pronto.

Agree with Dave the cab is where to start. That's where a lot of the makers cut costs, and they don't want it too heavy because it costs more to ship.

It’s definitely not a cure-all and IME it can offer as many drawbacks as it does benefits. Personally I’d favour looking at the type of stuffing and the amount in most cases, rather than just ripping it out. I don’t like the solid foam blocks in large quantities, but that’s just based on my dabbling. Less of that would be a good start. I have liked the effects of mass
-damping cabinet walls though. It always seems to go hand in hand with removing all stuffing, but the two don’t need to be linked. You can always put some or all the stuffing back.

I’ve tried doped and undoped drivers, which also seem to go with this territory. A narrow doping ring near the cone centre can work, but spreading loads of goo all over a driver is a sonic killer to me. Anyone in any doubt should just buy a few Royds. The ones with the most goo are the worst. Try taking a Minstrel and fitting undoped drivers. It’s so much better it’s not funny. I’ve had other doped/undoped experiences and they always tell me doping lowers efficiency and makes the drive unit slower and more lethargic in its response.

Just my thoughts. YMMV and I encourage anyone who is interested to try for themselves. It was fun for me and I hope it is for you.

Actually, it's Bison Kit and Plastidip to taste, but I shan't go there  

My speakers have no stuffing, no crossover, acrylic cabs and doped drivers. They sound bloody marvellous...

Whatever floats your boat. Listen without prejudice to as much different stuff as you can, try different things, develop your knowledge, go for what suits you.

Which speakers are you using, Rupert?