Replacing speakers in Lat-1's

What is your system by the way????

Nothing fancy, but I like it. I've got a pair of Spendor SP1/2Es driven by an Image 65i tube amp. Source is a Squeezebox through a Lavry DA-10 DAC.

Spendor makes their own mid/bass units in house and use a fairly high crossover point to the tweeter. There would be no practical substitute for the mid-woofer and they are already using Scanspeak for the tweeters. Use any other drivers in that speaker and you've completely defeated the purpose of buying a Spendor. You're in the same boat with any high quality design.

Since you have a Krell system I doubt you can improve your speakers other than changing them for LAT1000 ...
However DIY people with some knowledge of loudspeaker design and the help of of a measurement system can modify these speakers to sweet other amplification systems (eg. tube amplifiers) and their taste.
Can you imagine a tri-amplified LAT1 without passive crossover using an active crossover?

There sounding better. OOOps there brand new. Need to be broken in along with the new tweeters.

the answer is- Yes you can improove.and a lot. but-
1)I would strongly recomend not to change xover unless you want to fine tune speakers a litle. you can change tweeter to 70000 series ring radiator you will get better dynamic ,more imediacy insound(just measure/calculate krell xover voltage divider or serial resistor to ensure the same eficienty with THE SAME voltage divider values)

bass drivers also can be changed to better ones (22W) bass will be fuller and more punchy not hard sounding .

what you can not change its midrange.yoiu can but its likely 99% that it will sound worse. even the same drivers with 1mm shorter coil will have diferent response and will kill krells enginiers sound conseption.

as for my self I am using aluminium enclosures also and they deserves very best drivers, better thant theese in krell Lat1 IMHO

Have a pair of Krell LAT 1 speakers and have looked everywhere for replacement 8” woofers  Scan Speak Type 21W/16555-2 16 ohm speakers Called Krell and scan speak none available. I’ve looked everywhere and can’t find any.  Any suggestions on something that would work without having to modify the speakers. Thanks, Russell