Well, the wife's in Florida and my son was out so I could give these two pair of upper chain ADS speakers a good comparison.
First of all they were both driven by a Sony ta-n77es with a Parasound p5 preamp. Turntable used was a Denon 67L with a Denon dl 103r cartridge. CD player was a Yamaha cdr hd1500. Spotify was also used running through the P5's dac with desktop computer.The Canton sub was not used in the comparison although I do use it for normal listening.
Please note that the 1590's have had all the drivers replaced by Richard So in 2017 while the 1230's are original.
The 1590's seem to have a more pronounced mid-range than the 1230's. The mids just seem to be a touch stronger. Not better per say, but more pronounced. But the tweeters in both don't seem to have much of a difference. Both are clear, smooth, and unfatiguing. As far as the bass goes, they both can hit hard but a give a slight edge to the 1230's. The two woofers in the 1590's are quicker and punchier than the 1230's but the 1230's seem to go a bit lower. As far as the imaging goes they are both quite good but the 1230's have a slight edge. I think that's due to the cabinet design. The positions were swapped when I listened.

To sum it all up these speakers are extremely similar in their sound. They both have that great East coast ADS sound. The 1590's in my opinion are more of an "in your face" speaker where as the 1230's are a bit more laid back. It might have something to do with the mids being new in the 1590's.
Either way you can't go wrong with either pair of these speakers. My next test will be to bring the 1590's to Hudson Valley HiFi and square off with what Mike has in his showroom.
Music was
Donald Fagan/ Nightfly
Sting/ Soul Cages
Sade/ The Best of
Mark Knophler/ Private Investigations
Pink Floyd/ DSOTM
First of all they were both driven by a Sony ta-n77es with a Parasound p5 preamp. Turntable used was a Denon 67L with a Denon dl 103r cartridge. CD player was a Yamaha cdr hd1500. Spotify was also used running through the P5's dac with desktop computer.The Canton sub was not used in the comparison although I do use it for normal listening.
Please note that the 1590's have had all the drivers replaced by Richard So in 2017 while the 1230's are original.
The 1590's seem to have a more pronounced mid-range than the 1230's. The mids just seem to be a touch stronger. Not better per say, but more pronounced. But the tweeters in both don't seem to have much of a difference. Both are clear, smooth, and unfatiguing. As far as the bass goes, they both can hit hard but a give a slight edge to the 1230's. The two woofers in the 1590's are quicker and punchier than the 1230's but the 1230's seem to go a bit lower. As far as the imaging goes they are both quite good but the 1230's have a slight edge. I think that's due to the cabinet design. The positions were swapped when I listened.

To sum it all up these speakers are extremely similar in their sound. They both have that great East coast ADS sound. The 1590's in my opinion are more of an "in your face" speaker where as the 1230's are a bit more laid back. It might have something to do with the mids being new in the 1590's.
Either way you can't go wrong with either pair of these speakers. My next test will be to bring the 1590's to Hudson Valley HiFi and square off with what Mike has in his showroom.
Music was
Donald Fagan/ Nightfly
Sting/ Soul Cages
Sade/ The Best of
Mark Knophler/ Private Investigations
Pink Floyd/ DSOTM
