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Pre-Owned and Ex-Demo

Alta Audio IO Speakers

A great small speaker from Alta Audio. Very entertaining and musical.

New Old Stock – Excellent Condition

Our Price £1,895 (RRP £3,500)

About the IO Speakers

The IO Speaker is no longer in production from New York company Alta Audio, having now been replaced by the Alyssa. But this is a speaker that is still worthy of recognition as it's blend of great build quality, driver quality and careful design create a brilliant performer. A small stand mount with a two inch ribbon tweater and a seven inch mid/bass driver, it has great treble extension but naturally is limited in the bass with roll-off at around 42Hz. However, the bass loading is unusual in this design with a combination of transmission line and port loading – the result of which is a surprisingly natural and agile bass that is very informative and musical.


  • Dimensions: (HWD) 14.5" x 8.5" x 13"
    Weight: 27lbs

  • Driver complement:
    – One 2 inch ribbon tweeter
    – One 7 inch midrange/woofer

  • Sensitivity: 87.5 dB / 2.83 Volts @ 1 Meter

  • Frequency Response: 42Hz to 47kHz

  • Impedance: 4.Ohms

  • Requirements: 50 to 150 Watts per channel

The Winters Audio Experience

For small rooms and for someone who doesn't really want to blast out window-rattling rock, these are a seriously good little bargain just waiting to be snapped up. They work well with a good fifty watt amplifier but you should note that the moderate sensitivity and 4 Ohm impedance rules out small amps. 

Set up on good stands they perform beautifully. The combination of the ribbon tweater and the unusual transmission line/ported bass gives a very open and extended sound both top and bottom. Indeed that bottom end sounds much more impressive than the figures suggest – there's quality here. Indeed, we've sat back and relaxed in front of these little gems and spent hours meandering through back catalogues, marvelling at the smoothness, subtlety and three-dimentionality these speakers were producing from old recordings that we didn't think were that good!

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