20to20..
All the NEW series have the remote...
The DLS-3500, 3750 and 4000 all have been replaced with the same model number though now with the "R".
Here is the manual for the old series -
DLS Series
Here is the new -
DLS-R series
First thing I note is the enclosure difference....
Response, Amp, Weight, Driver Size all seem to be the same comparing the manuals details..
Your right, hefty price premium for a remote! Thing I dont like the idea about is how do you really know how high your volume is??
<shrugs>
A