The HR824 studio monitors are high-resolution, two-way, bi-amplified, active monitors - These monitors employ a 6th-order Butterworth system with a built-in rear-firing mass-loaded passive radiator. compact cabinet with built-in control and amplifier electronics. Recently serviced and tested by DALAUDIO and found to be in working order. Great sounding monitors! Physical condition if generally good, no major issues. Priced accordingly. We are including a copy of the original specification; a copy of the original service manual is available if you bring a USB Drive. We will also include a pair of TS 1/4 Plug to RCA  adapter if you need RCA inputs. 
 
Note: We have three of these available. Let us know if you need just one or want to buy all three. If you buy all three price is $550
 
Cash Sale, No Holds, Call or Text for Pick-up. No Shipping. 
 
Components 
1-inch aluminum-alloy high-frequency transducer
8.75" high-precision diecast magnesium frame low-frequency transducer,
6" x 12" passive radiator on the back for response down to 39 Hz.
 
The high-frequency driver is mounted on a massive, acoustically non-resonant die-cast zinc exponential waveguide, which results in wide, controlled dispersion for high-frequency sounds. Flat frequency response (±1.5 dB, 39 Hz to 20 kHz)
 
Amplifiers: HR824 cabinet provide low-frequency amp rated at 150 watts RMS continuous output, and the high-frequency amp is rated at 100watts RMS Cont.
 
Cabinet: The cabinet is constructed using 3/4-inch (19 mm) thick MDF with a 1-inch (25 mm) thick MDF front panel. An internal H-brace provides additional cabinet stiffness, and open cell adiabatic "foam fill" acoustic damping material absorbs internal reflections. 
 
Connections: Back Panel accepts XLR, and with 3 Pin adapter unbalanced RCA connectors. The connectors face downward so the monitor can be placed flush against a wall.
 
Controls 
Input sensitivity control: trims gain from input to output/ adjust input levels.
Acoustic Space: adjusts bass response for corner or wall placement.
Low-frequency: select high-pass cutoff frequency of 37 Hz, 47 Hz, and 80 Hz,
High-frequency provides either 2 dB of boost or cut above 10 kHz.
Power mode: to turn the monitor on and off, a function that is duplicated with the front panel switch, or to put the monitor into auto mode, where the amplifiers revert to standby when no signal is present for several minutes. The instant a signal appears at the input, the amplifiers seamlessly come back to life and produce sound.
 
Published Specifications
Free Field Frequency Response: 39 Hz–20 kHz, ±1.5 dB
Lower Cutoff Frequency: –3 dB @ 37 Hz
Upper Cutoff Frequency: –3 dB @ 22 Hz
SPL @ 1 meter, 7.5 dBu into Balanced Input: 100 dB SPL @ 1m
Max SPL Peak Per Pair: 120 dB SPL @ 1m
Amplifier Low Frequency Power: 150 watts, 4Ω load 350 watts peak
High Frequency Power: 100 watts, 6Ω load 210 watts peak
Slew Rate: >35V/µs Distortion (THD, SMPTE IMD, DIM 100): <0.035% Signal-to-Noise Ratio: >102 dB referenced to 100 watts into rated load
Type: FR Series Class AB
Electronic Crossover Crossover Type: Modified Linkwitz-Riley, 24 dB/octave
Crossover Frequency: 2000 Hz
Sensitivity: 0 dBu nominal Input Impedance: 20 kΩ, balanced bridging
Compressor: Independent high and low frequency overload detection
Dimensions: (H x W x D): 15.75" x 10.00" x 12.20"