Twochannel Reference Build — Large-Room Scale Separates

For a listener with a large room who wants full orchestral and large-scale dynamic swings reproduced without strain. It pairs monoblocks that double their output into 4 ohms with a floorstander that needs that current, prioritizing weight and dynamic ceiling over compactness or efficiency.

This system is assembled to do one thing that small systems cannot: move a large volume of air on demand without the amplifier running out of current. The Burmester B80 is a five-driver, three-way floorstander of 90dB sensitivity and 4-ohm nominal impedance, its bass reaching to 30Hz. A speaker like this, asked to fill a large room at realistic orchestral or rock levels, draws heavy current on transient peaks, and its low-frequency drivers need an iron grip to start and stop cleanly. The Ayre MX-R monoblocks are built for exactly that demand. Each delivers 300 watts against an 8-ohm load, rises to 600 as the impedance halves to 4 ohms, and stays stable down to a 2-ohm minimum, so as the B80's impedance dips the amplifier supplies more current rather than compressing. That doubling behavior, not the nominal wattage figure, is the whole point: it means a sudden fortissimo arrives at full amplitude instead of being flattened. The digital front end is kept short so none of that output is squandered. The Bluesound NODE 2i passes a digital stream to the Benchmark DAC3, whose own volume stage drives the monoblocks directly, removing a separate line preamplifier and the gain it would add. What the listener experiences is dynamic ease: a full orchestra can crescendo from a whisper to a hall-filling climax with the tonal weight of the lower strings and brass intact, and the leading edge of a bass drum lands with force rather than a soft thump. This is a tonal-density presentation, weight and body foregrounded, built from the amplifier's current reserve meeting the speaker's radiating area. What is structural here is the pairing of an amplifier that doubles into low impedance with a speaker that needs it. Substitute a 30-watt amplifier and the B80's dynamic ceiling collapses at the first loud passage.

This system is built for a large space and pays for it elsewhere. In a small or lightly furnished room the B80's low-frequency output overloads the boundaries and turns thick, so it needs volume and distance to breathe. The 4-ohm, 90dB load is genuinely demanding, which is why the amplifier costs what it does; this is not an efficient or low-budget path. The digital volume stage means an analog source such as a turntable cannot be added without inserting a preamplifier. And at the low levels of late-night listening, the dynamic headroom that justifies the design sits mostly unused.

• 01

  Swap MX-R → X250.8 (−$6,950)

  For a single-chassis stereo amplifier at markedly lower cost that still doubles from 250 watts into 8 ohms to 500 into 4, the Pass X250.8 keeps most of the current delivery while giving up the monoblocks' channel separation and outright headroom.

• 02

  Swap B80 → Sasha 2 (−$199)

  For a higher dynamic ceiling and greater power handling, the Wilson Sasha 2 trades the Burmester's voicing for a ported 4-ohm design rated to 1000 watts, pushing the system's maximum output higher still.