You will be glad to know that not only IDA-16 has RCA line out, the soon to be shipping (in May) IDA-8 ($899) also have line out.
Oops, I just leak the news about IDA-8. Please be patient, more info will be available in two weeks.
IDA-8 is yet another new Class-D design specifically for speakers in the $3000 and below (it is good enough to match high efficiency high end speaker).
Inputs:
1 x USB PCM / DSD Digital (PCM UP TO 384K & DSD UP TO DSD256 )
1 x Coaxial Digital S/PDIF (PCM UP TO 192K)
1 x Optical Digital S/PDIF (PCM UP TO 192K)
1 x BTR / WiFi INPUT
1 x Analog Stereo RCA
Outputs:
1 x Optical (up to 24 bit/192 kHz)
1 x Stereo RCA (Line out)
1 x Stereo Speaker (Binding Posts) Output
USB Sampling Rates: 44.1KHz, 48KHz, 88.2KHz, 96KHz, 176.4KHz, 192KHz, 352.8KHz, 384KHz,and DSD 2.8MHz, 5.6MHz, 11.2MHz
S/PDIF Sampling Rates: 44.1KHz, 48KHz, 88.2KHz, 96, 176.4KHz, 192KHz
Maximum Sampling Rate: 24-bits / 32-bits
Bit Resolution: 16-24-32 bits
Power output: 140W x 2 (4-Ohm)
THD+N: 0.004%
Peak Output Power: 280W
Frequency Response: 10Hz to 80kHz