By Bespoke

Krell Theater 7 Amplifier

Name: Krell Theater 7 Amplifier
Brand: By Bespoke
Price: 18999.00 AUD
Availability: InStock

$18,999.00 AUD

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Krell Theater 7 Amplifier

$18,999.00 AUD

Product Description

The Theater 7 XD amplifier design uses Krell Current Mode technology—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, thus giving the Theater 7 a more effective power supply than other amplifiers that have smaller dedicated power supplies for each channel.

Krell. For when compromise simply isn't an option.

Krell Theater 7 XD

The benchmark in Class A Amplification

Krell’s history is rich with breakthrough Class A amplifiers that have helped build the Krell legacy of offering the best sounding amplifiers available. Our revolutionary, patent pending circuit delivers true Class A operation without the excessive heat and wasted energy of conventional designs

Power Supply Highlights

Power supply technology has always been an important contributor to the Krell sound. The power supplies of our Krell iBias Class A amplifiers have been optimized for use with the iBias circuit. Depending on the model, up to four toroidal transformers feed amplifier modules that include the audio circuitry, rectifier, and power supply filtering mounted to an individual heat sink. This design shortens the electrical path from the power supply to the output transistors, reducing the overall impedance and allowing the circuit to respond faster and control the speakers even better and more accurately.

Unlike traditional Class A amplifiers, iBias Class A amps have a compact design that allows rack-mounting, making them ideal for custom installation as well as traditional audiophile systems. This convenient form factor is made possible through thermostatically controlled ventilation fans. The fans used are specifically chosen for quiet operation, and operate at the speed required to maintain the ideal internal temperature. They run only during periods of peak energy demand – when the music is at its loudest – so they are inaudible in normal use.

Circuitry Highlights

The new iBias circuitry is built on a foundation of core Krell circuit technologies. All signal gain is realized in the current domain using proprietary multiple-output current mirrors with extraordinary open loop linearity. Each amplifier channel uses all discrete components. There are no generic integrated circuits or op amps used anywhere. Gain is distributed among several stages, allowing each to have a large linear operating area.

Audio signal voltages are converted to current at the amplifier input, and the audio signal remains in the current domain throughout the entire amplifier.

Technical Specs

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

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)