Graham Chartwell SUB3 Subwoofer
The SUB3 is a sub-woofer designed to work with the Chartwell LS3/5 and LS3/5A from Graham Audio, but it is also applicable to other designs of similar sensitivity and impedance.
The SUB3
The SUB3 is a sub-woofer designed to work with the Chartwell LS3/5 and LS3/5A from Graham Audio, but it is also applicable to other designs of similar sensitivity and impedance. Designed by Derek Hughes, it employs a novel bass loading technique to achieve extension down to 35Hz in a compact enclosure.
They are supplied in pairs, and are designed to be placed near to the rear wall, while the main loudspeakers remain in their usual ‘free space’ position. Output is via the front-facing reflex port.
There are connections on the rear for the input from the amplifier and output to the main speakers. There is also provision for feet or spikes to be fitted to the base of the cabinet. Being passive, there are no controls to misadjust – the system is designed to be “plug and play”.
The crossover uses high quality components, including air-cored inductors for zero saturation distortion and polypropylene capacitors. The system crosses over at 100Hz, and in doing so, relieves the LS3/5 or LS3/5A of energy frequencies below this point. This will allow the system to reach greater replay volumes, providing there are adequate reserves in the amplifier used.
The SUB3 is available in Black or Teak finish.
Alignment: 4th order bandpass
Finish1: Real wood veneer
Dimensions (w/h/d): 30cm by 30cm by 34cm
Frequency response: 35Hz to 100Hz
Nominal impedance: 8Ω
Sensitivity: 84dB SPL (2.83V, 1m)
Recommended amplifier power: 30 to 80 watts unclipped programme
Connections: Gold-plated binding posts
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“I think many existing owners of the classic BBC speaker would happily go for a bass add-on that retains the loudspeaker’s agility than impose a new character.
The LS3/5 and LS3/5a are icons of classic British audio, and the SUB3 extends that icon further into the bass without tampering with what makes the LS3/5a so special in the first place. Those who have lusted after LS3/5 or LS3/5a designs – or those who already own a pair – will accept no substitute and brook no change to the design. For them, the SUB3 is a perfect solution to the ‘not a lot of bass’ problem inherent to that iconic loudspeaker. That classic BBC small monitor for small rooms need not sound quite so small now. ”
Alan Sircom, 7Review, Aug 2018 <learn more> Reposted at HiFi+(UK) Nov, 2018
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