Martin Logan woofer amplification

Op amps ("operational amplifiers") are not power amplifiers, they are small signal devices used in line-level and other low power circuitry.

However it is quite possible that the input circuit or other circuitry that is "ahead" of the power stage in the amplifier includes an op amp, with one of its purposes perhaps being to perform the necessary low pass filtering.

Op amps tend to often be viewed negatively in high end audio, which is deserved in some cases and not deserved in others. In a bass amplifier application I would not expect the use of an op amp to necessarily mean compromised sound quality. But the dealer may not understand what an op amp is, or he may be dogmatically biased against them, or he may be anticipating that his potential customers would be dogmatically biased against them.

Regards,
-- Al

You have a point as the Montis may use the low pass filter to send the sub 400hz signal to the woofer

The Montis uses a Class D amp.

The Summit has 2 B&O ICEpower ASC200 amp modules. They are rated at 200 watts into 4 ohms. This is the same amp used in the Bel Canto S300i integrated, PS Audio C100 integrated, PS Audio A100 amp, Red Dragon Amp1 monos and many other products.

I based my above assumption on this review.

Here is the paragraph:

"The Summit's active amplification includes toroidal power transformers, as part of a high performance bipolar amplifier that is said to offer better tracking of the input signal and reduced hysteresis.

Other claimed benefits are a more open, dynamic performance than would have been expected with otherwise similar IE transformers, especially at high levels. In general terms, bass performance comes closer than previous designs to matching the speed and transparency of the electrostatic mid and treble.

The hard built crossover is derived from the network used in the Statement, with air core inductors, audiophile grade polypropylene caps and point-to-point hard wiring."