I too find the Spendor line-up a little confusing. Here are some retail prices.
SP3/1R $2795
SP2/3R $3695
SP1/2R $5595
SP100R $9495
A5 $2595
A6 $3295
S5e $2195
S8e $4195
S9e $6495
ST $8995
The SPs are clearly positioned as high-quality monitors. The "A" series seems to overlap the lower end of the "S" series. The single ST speaker seems to be "up market", but doesn't go as low as the less expensive S9e, while the ST is itself less expensive than the SP100R.
Hmmm.
SP3/1R $2795
SP2/3R $3695
SP1/2R $5595
SP100R $9495
A5 $2595
A6 $3295
S5e $2195
S8e $4195
S9e $6495
ST $8995
The SPs are clearly positioned as high-quality monitors. The "A" series seems to overlap the lower end of the "S" series. The single ST speaker seems to be "up market", but doesn't go as low as the less expensive S9e, while the ST is itself less expensive than the SP100R.
Hmmm.