You can find a demo of the LEQ-5 here.
via Innerclock Systems
"The LEQ-5 is a specialised five-band inductor EQ module crafted to enhance the 'sweet spots‘ across the bass spectrum. The design incorporates high-quality components that provide exceptional performance using genuine custom-wound ‘tuned’ inductor coils generating a wide sonic pallet and focused tone shaping with + / - 15dB of gain and attenuation on each band.
Features
* Five band induction-coil EQ tailored for low / low-mid frequency signal processing.
* Low and High frequency shelves.
Package Contents
* LEQ-5 Bass Equaliser module.
* 16-pin to 10-pin Euro-rack ribbon power cable.
Connecting the LEQ-5
Typically we would suggest inserting the LEQ-5 at the end of the audio signal path keeping the input signal level low enough to allow for the cumulative output signal gain possible.
Shelving EQ
Separate LF and HF shelving.
Inductive EQ
The use of inductors in equalisation circuitry has a rich history going back to the 1950s. Inductors can be found in the signal path of many high end vintage recording consoles, outboard EQ, bass and guitar amplification and effects pedals."
