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A comment on the new Krell sound from our XD upgraded amplifiers…Initially, there’s no comparison between the two models (pre and post XD upgrade) – the jump in resolution and musicality is massive. It’s like they are channeling the sound that made Krell famous, while incorporating the changes in technology that have come to be over the last 35 years
THEATRE-7XD – a 7x Channel Power Amplifier 100 Watt Amplifier Featuring Krell iBias Technology
The amplifier design uses Krell Current Mode technology that is fully differential and discrete in the critical gain stages. This results in a highly linear and extended frequency response, well beyond the range of hearing, for smooth effortless highs and tight high impact bass.
The power supply consists of two 787VA toroidal transformers and 160,000uF of capacitance. This is shared among all the channels so all of that power is available to the channels with the most demand.
In real world conditions the left, right, and centre channels require the lion’s share of the power so this gives the Theatre 7 a more effective power supply than other amplifiers that have smaller dedicated power supplies for each channel.
When developing the THEATRE7-XD, David Goodman, our Director of Product Development, whom has been with Krell since 1987 and was largely responsible for design work on all Krell products, discovered that with modifications to the output stage, we could vastly improve sound quality, across the board, to all of our amplifiers.
THE RESULT
A deeper, darker, blacker background that provided significantly better macro and micro dynamics, more silence between the notes. Vocals and midrange took on an organic, yet more vibrant tone, enabling us to hear much more body, and even though our amps were great before, there was a very significant improvement. The speakers disappeared; yet, instruments were more focused with appropriate size and specific soundstage locations. All in all, a much better sounding, much improved experience that was easily, immediately heard by all that listened.
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
434W x 194H x 536D mm
Weight
32kg (unit only)
36.4 kg (shipping)
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