Dynaudio special forty bookshelf speakers Red Birch, Pre Loved, used, 2nd hand

Cutting-edge acoustic technology in a classic Dynaudio design

We do compact speakers really well. We always have. So, as a nod back to classics including the Special One, the Special Twenty-Five, the Craft and the Contour 1.3SE, we kept the Special Forty pure – if incredibly advanced.

Of course, it wouldn’t be an anniversary speaker if it didn’t include some of our greatest hits. But we haven’t just got the old band back together to trot out the same old stuff, unchanged. We’ve remixed, remastered and rearranged things to bring those old favourites into 2017 – and beyond.

That’s why it has one of our classic first order crossover designs, incorporating our unique Phase Alignment and Impedance Alignment technologies. The crossover expertly marshals the input signal between the woofer and the tweeter – so each driver gets only the frequencies it’s supposed to, and can perform at its very best. Its specially selected components handle the impedance optimisation and, because both drivers have extended frequency ranges for even better overlap and integration, that performance borders on the mesmerising.

It moves the air in typically sweet fashion in front of the DSR (Dynaudio Secret Recipe) precision-coated soft-dome, of course, but there’s a lot of engineering going on behind it as well.

Take the new pressure conduit. It’s a shaped vent in the back of the hybrid magnet system that allows more space in the rear chamber. That space lets us pack in more damping material and reduces back-pressure, while the shape itself optimises airflow coming backwards from the rear of the dome.

Then there’s the outlet; the aero-coupled pressure-release system. It sits underneath the voice-coil and reduces unwanted pressure build-up that could affect its movement. Stopping those pockets of air from forming reduces resonance – and less resonance equals even greater potential for detail.

• Sensitivity (dB @ 2.83V/1m)86
• IEC Power Handling (W)200
• Rated Impedance (Ohm)6
• Lower Cutoff (Hz @ +/- 3 dB)41
• Upper Cutoff (kHz @ +/- 3 dB)23
• Box PrincipleBass reflex rear ported
• Crossover2-way
• Crossover Frequency (Hz)2000 Hz