This is a rare 1U mono compressor from Aphex. The Expressor was from the era of the Dominator & Compellor levelling compressors but was a single-channel unit more aimed at recording studios than broadcasters. Using the knowledge of psychoacoustics and signal processing gained in previous products, the Expressor uses similar technology to create a compressor with a flexible sidechain and built-in HFX high-frequency expansion
The sidechain offers a a low cut filter to reduce pumping of the signal by the low frequency content, a hard / soft knee switch and a slave function for stereo linking. Two Expressors can be linked using a jack-to-jack cable. The sidechain send & return are on jack sockets as well. The HFX system gives high-frequency expansion to reduce dullness when using large amounts of compression and the amount & frequency of the expansion are adjustable
These Aphex products were built to an extremely high standard with substantial aluminium front panels and steel cases plus high-quality electronics. This was a reflection of their broadcast heritage – and their high purchase price!
I have two Expressors available (see photos) and this auction is for one unit