Theater 7 XD
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Brand New Krell Theater 7 XD 7-Channel Power Amplifier for sale with Warranty
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Krell’s XD (Xtended Dynamics, Dimensionality & Detail) upgrade for the iBias amplifiers takes an already great sounding amplifier and raises its performance to the next level. XD is a classic example of Krell’s continuous R&D efforts reaping benefits across multiple product lines. During the development of the K-300i Integrated Amplifier we discovered substantial sonic improvements by lowering the output impedance below traditional norms. When applying this technique to our existing line of amplifiers, the improvement was so substantial, it deserved its own, unique designation—XD.
It was no simple matter merely lowering the output impedance. This affects the amplifier’s stability and transient response, so each stage prior to the output stage had to be re-tuned to work optimally with the lower output impedance. This lower output impedance exerts more control over the speaker drivers, and damps out unwanted vibrational modes—allowing a more accurate reproduction of the original signal
The “XD” upgrade for the Chorus/Duo/Solo amplifiers reduces the output impedance to less than half of its original value. This lower output impedance better damps unwanted speaker vibrational modes. Changing the output impedance also necessitated re-compensating each amplifier stage to achieve optimal critically damped transient response. This ensures that the amplifier accurately follows the dynamics of the input signal.
Frequency response
20 Hz to 20 kHz +0, –0.11 dB
<3 Hz to 200 kHz +0, –3 dB
Signal-to-noise ratio
>101 dB, wideband, unweighted, referred to full power output
>114 dB, “A”-weighted
Gain
25.5 dB
Total harmonic distortion
<0.02% at 1 kHz, at 100 W, 8 Ω, two channels driven;
<0.20% at 20 kHz, at 100 W, 8 Ω, two channels driven;
Input impedance
Single-ended: 27 kΩ;
Balanced: 54 kΩ;
Input sensitivity
Single-ended or balanced: 1.50 V RMS
Output power, per channel
120W RMS at 8 Ω, 2 channels driven
115W RMS at 8 Ω, 3 channels driven
110W RMS at 8 Ω, 5 channels driven
105W RMS at 8 Ω, 7 channels driven
210W RMS at 4 Ω, 2 channels driven
190W RMS at 4 Ω, 3 channels driven
165W RMS at 4 Ω, 5 channels driven
140W RMS at 4 Ω, 7 channels driven
Output voltage
93 V peak-to-peak
33 V RMS
Output current
10 A peak
Output impedance
<0.025 Ω, 20 Hz to 20 kHz
Damping factor
>320, 20 Hz to 20 kHz, referred to 8 Ω
Power consumption
Standby: 1 W
Idle: 66 W
Maximum: 2000 W
Heat output
Standby: 3.42 BTU/hr.
Idle: 225 BTU/hr.
Maximum: 2200 BTU/hr.
Inputs
7 single-ended via RCA connector
7 balanced via XLR connector
Outputs
7 pairs five-way binding posts
Remote connectors
One 12 VDC input (12 V trigger) via 3.5 mm jack
Dimensions
17.1 in. W x 7.65 in. H x 21.10 in. D
434 mm W x 194 mm H x 536 mm D
Weight
80 lbs., 36.4 kg (shipping)
70 lbs., 31.8 kg (unit only)