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  1. #1
    Administrator Tracy Rainwater's Avatar
    Join Date
    Sep 2003

    Krell Theater 7 7 Channel Power Amplifier

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    Krell has just announced a new home theater power amplifier. The Theater 7 is a seven channel Class A amp that uses what the company calls iBias Class A Technology.

    iBias Technology allows the amp to run in full Class A mode, with all the sonic benefits of a Class A amp, while minimizing heat. Anyone who has owned or experienced a Class A amp firsthand knows how hot they can run. If the iBias Technology can reduce the heat produced, it solves one drawback of a Class A design.

    Here's a bit of the press release.

    Circuitry Highlights

    Krell iBias Class A technology allows our latest amplifiers to run in full Class A mode to full power while minimizing heat generation.

    The Theater 7 Amp uses iBias technology to maintain Class A operation up to 100 watts into 8 ohms for the left, right, and center channels and up to 50 watts for the four surround channels. This provides the critical front channels with high bias current to produce that lush, open Class A sound while also minimizing the heat output and power consumption of the whole amplifier.

    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.

    Power Supply Highlights

    The power supply consists of two 700VA 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 center channels require the lion's share of the power so this gives the Theater 7 a more effective power supply than other amplifiers that have smaller dedicated power supplies for each channel.
    Specs from the press release.

    • 100 Watts into 8 Ohms
    • 7 ea - Single-ended RCA and Balanced XLR Inputs
    • 1 RJ45 Ethernet Port
    • 1 12V Trigger Input
    • Optional Rack Mount Kit
    • 17.1in W x 7.65in H x 21.10in D, 43.4cm W x 19.4cm H x 53.6cm D
    • Weight: 70lbs, 31.8kg
    • 7 pr 5-way binding posts

    For more information about the Krell Theater 7, visit the product page at Multi Channel Amplifiers

  2. #2
    Senior Member David Vaughn's Avatar
    Join Date
    Jul 2002
    Northern, CA

    I reviewed their first iBias amp a couple of years ago and it was arguably, the best amp I had ever reviewed. It was damn expensive though at $9500. Here's a link to that review: Krell Chorus 7200 Amplifier | Sound & Vision
    David Vaughn
    Technical Writer/Blu-ray Reviewer
    Sound and Vision Magazine

  3. #3
    Administrator Tracy Rainwater's Avatar
    Join Date
    Sep 2003

    Nice review, I hadn't read it until now.

    The Theater 7 doesn't appear to have the fans that the Chorus 7200 does. I suppose since it's rated output is roughly half of the 7200, maybe the Theater 7 doesn't need them.


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