Ashly MX-508
An eight-channel rack mixer that Ashly built like a small console, with modular cards, sweepable mids, and a spec sheet that reads like a dare.
Overview
The MX-508 packs a lot into five rack spaces. It is an eight-channel stereo mixer with eight XLR mic inputs and eight line inputs, arranged as an 8x2 configuration. Ashly pitched it at sound reinforcement, live sound, broadcast, and location work. The feature list fits that: three-band EQ with a sweepable mid on every channel, two aux sends per channel with two master aux sends and returns, per-channel insert jacks, input level and level/pan controls, mic/line switching, a mono output control, a headphone control, and 48-volt phantom power across the mic inputs.
What sets the MX-508 apart from a lot of rack mixers in its class is how it's built. EQ Magazine (March 2000, p.108) looked into the topology and found a modular design. Each channel's input controls and output jacks live on separate circuit cards, mounted to their respective panels. The audio ICs are socketed, so a tech can swap them without desoldering, and all the pots are independent rotary types. That matters on a mixer that lives in a road case and takes a beating on its knobs. Serviceable pots and socketed chips mean a repair instead of a write-off.
The spec sheet is where the MX-508 gets interesting, and also where the documentation gets a little slippery. EQ Magazine's March 2000 review (p.108) measured frequency response at 20 Hz to 20 kHz, +0.5/-1.0 dB, and distortion at less than 0.05%. The same review noted the phantom supply delivers 48 volts DC with a maximum total current draw of 80 mA and a maximum single-channel draw of 14 mA — enough to know the phantom rail is real, but also a reminder that eight condensers at once will push it. Meanwhile the comparison tables in the period mixer surveys list the MX-508's frequency response variously as 10 Hz–100 kHz, 20 Hz–20 kHz, and 20 Hz–20 kHz +0/+0.5 dB depending on which printing you're reading. Treat the tighter, review-measured figure as the honest one; the wider numbers look like spec-sheet optimism rather than bench reality.
The channel layout is simple. There are eight mic inputs on XLR, eight line inputs, two aux sends and two returns on 1/4-inch jacks, and a stereo main output with its own level controls plus a separate mono output control. EQ Magazine (March 2000, p.107) described the front panel as carrying independent rotary pots with mute switches for the left and right main outputs, and a single phantom power switch that applies +48 volts to all eight mic inputs at once. There is no per-channel phantom, so think about that before patching a ribbon mic next to a condenser. A 10-segment LED meter handles monitoring, and the whole thing is 5RU in a rack. The sweepable mid on the three-band EQ is the useful part in live work. A fixed-mid three-band is a blunt instrument, and the sweep lets you ring out a room.
The documentation leaves some details open. The period surveys consistently state that the unit does not offer solo-in-place, and the front-panel description from EQ doesn't mention it either. The survey columns list "N/A" for bus outputs on the MX-508, which looks like a table-formatting artifact, since the unit clearly has stereo and mono main outputs. Original production years aren't documented in the available material, and neither is weight or dimensions. The build quality is documented.
Today the MX-508 makes sense as a utility mixer: a small live rig, a location recording front end, a broadcast or podcast desk, or a submixer feeding a larger console. The modular card construction and socketed ICs mean a competent tech can keep one running, and the sweepable mids give it more tone-shaping range than the fixed-EQ competition in the same rack space.
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