All replies so far have recommended using passive speakers. Passive speakers connect a single external amp (which you supply) to a passive high-current crossover which is connected to the drivers.
I suggest an alternate approach. You should consider spending as much of your $1500 as possible on a pair of active speakers and the remainder on a DAC with volume control. Active speakers have a line-level crossover and a dedicated built-in amp connected to each driver. Although it is possible to build a good system using passive speakers, the technical advantages of active speakers are well documented, and recording engineers use active speakers almost exclusively. There are many options for active speakers at this price point.
Most active speakers take a balanced input (ubiquitous in pro equipment), so you'll want to look at DACs with balanced outputs. It is possible to find balanced DACs with volume control for $300 or less brand new from pro companies. Most of those will also include a headphone amp.
I suspect you'll get the most value from your money if you go down this road.
I suggest an alternate approach. You should consider spending as much of your $1500 as possible on a pair of active speakers and the remainder on a DAC with volume control. Active speakers have a line-level crossover and a dedicated built-in amp connected to each driver. Although it is possible to build a good system using passive speakers, the technical advantages of active speakers are well documented, and recording engineers use active speakers almost exclusively. There are many options for active speakers at this price point.
Most active speakers take a balanced input (ubiquitous in pro equipment), so you'll want to look at DACs with balanced outputs. It is possible to find balanced DACs with volume control for $300 or less brand new from pro companies. Most of those will also include a headphone amp.
I suspect you'll get the most value from your money if you go down this road.