I have a set of your MK 750 system speakers, including an additional two surround-550 THX and second V1250 subwoofer for 7.1 surround capabilities (the subs are terminated on a single output from the receiver via Monster “Y” adapter).
Until recently, I was using a Sony STR-DA5300ES receiver to drive the speakers (since 2007). However the receiver popped its front channel circuit board (driving the L/R channel), also causing the RF speaker to pop its capacitors. Sony replaced the receiver with a new STR-DA5600ES receiver, and I had the speaker repaired.
Before I hook things back up, I want to ensure that I am not overdriving the speakers (leading to failure again). The receiver has been set to 4 ohm output, to match the speaker impedance. However, when I perform the “auto-calibration”, it sets all of the speakers to “Large”. As I understand it, this means that lower frequencies are sent to the satellite speakers, instead of sending to the subwoofers.
My questions are; should the speakers be set to “large” or “small”, and what should the crossover frequency be set at for each speaker type in the system?
Also, any other general advice you can give me to prevent another ‘blow out’ would be greatly appreciated. I have included the receiver specifications below. Thank you in advance for your help.
AUDIO POWER SPECIFICATIONS:
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:
With 8 ohm loads, both channels driven, from
20 – 20,000 Hz; rated 1303) watts per channel
minimum RMS power, with no more than
0.09% total harmonic distortion from 250
milliwatts to rated output.
Amplifier section
POWER OUTPUT
Rated Power Output at Stereo Mode1) 2)
(8 ohms 20 Hz – 20 kHz,
THD 0.09%):
130 W + 130 W3)
120 W + 120 W4)
Reference Power Output at Stereo Mode
(4 ohms 20 Hz – 20 kHz,
THD 0.15%):
130 W + 130 W3)
120 W + 120 W4)
Reference Power Output
(8 ohms 1 kHz, THD 0.7%)
FRONT2):
140 W + 140 W3)
130 W + 130 W4)
CENTER2): 140 W3)
130 W4)
SURROUND2):
140 W + 140 W3)
130 W + 130 W4)
SURROUND BACK2):
140 W + 140 W3)
130 W + 130 W4)
Reference Power Output
(4 ohms 1 kHz, THD 0.7%)
FRONT2):
130 W + 130 W3)
120 W + 120 W4)
CENTER2): 130 W3)
120 W4)
SURROUND2):
130 W + 130 W3)
120 W + 120 W4)
SURROUND BACK2):
130 W + 130 W3)
120 W + 120 W4)
