Twochannel Reference Build — Warm Dual-Concentric Integrated

For a listener who plays vocals, jazz, and acoustic music in a modestly sized room and wants an image that locks to a single point without fuss at high volume. The pairing chooses warmth, coherence, and simplicity over deep bass and raw power, with the streamer kept clean and out of the way.

A dual-concentric driver mounts the tweeter at the throat of the bass-mid cone, so treble and midrange leave the cabinet from the same point rather than from drivers spaced apart on a baffle. That is the organising idea of the Tannoy Sandringham SE, and it is why the speaker images the way it does: a voice comes from one apparent location, its chest and breath aligned in time instead of split between two units crossing over near the ear's most sensitive band. The 8-inch unit presents a 90dB, 8-ohm load — an easy one, with a smooth impedance curve and no dip to fight — which reshapes what the amplifier has to be. Because the speaker is efficient and untroublesome to drive, the Heed Obelisk Si III's 50 watts into 8 ohms are ample, and that frees the amplifier to be a short, simple circuit instead of a big one. Its warm, rhythmic voicing follows from that simplicity: a sensitive 0.25-volt input and a minimal signal path give a full, faintly forward midband and a sense of drive that suits acoustic and vocal music at living-room levels. With no impedance dip in the Tannoy to exhaust the modest power, the 50 watts never feel like a limit in a normally sized room. The Bluesound NODE provides the front end, its ES9039Q2M converter decoding to 24-bit/192kHz and DSD256 at 0.0007 percent distortion, passed to the Heed at fixed level over RCA so the integrated sets volume. The source is deliberately the most neutral link, which leaves the tone to the amplifier and the speaker. Put a lean, high-damping transistor amplifier here instead and the dual-concentric's forward midrange would edge toward hardness; the warmth is as much the Heed's contribution as the Tannoy's.

The Sandringham SE is voiced for tone over reach: its bass falls off near 39Hz, so the lowest notes of organ, synth, and drop-tuned guitar are only suggested, and the single 8-inch driver caps how loud it will play cleanly in a large room. Because everything is tuned toward a warm, forward midrange, the presentation flatters voices and acoustic instruments but can gloss over the very top of cymbals and air. The Heed's 50 watts, generous on this efficient load, would run short on a harder-to-drive speaker, so the pairing does not transfer to a low-sensitivity monitor. And the dual-concentric wants a fairly exact toe-in; off the intended axis its coherence and tonal balance both soften.

• 01

  Swap Obelisk Si III → EVO 100 (+$996)

  Swapping the Heed for the PrimaLuna EVO 100 moves from solid-state to an EL34 tube integrated of about 40 watts, adding a rounder, more textured midband on the efficient Tannoy at the cost of tube upkeep and a little bass grip. The 90dB sensitivity keeps 40 tube watts comfortable at living-room levels.

• 02

  Swap Sandringham SE → Forte IV (+$3,325)

  For higher sensitivity and more low-end weight, the Klipsch Forte IV substitutes a three-way horn with a rear passive radiator reaching into the low 30s of Hz. Its 99dB sensitivity makes the Heed's 50 watts feel limitless, trading the Tannoy's single-point imaging for horn dynamics and a larger cabinet.