The Legends 500 Series

PEQ-1549 Equalizer


The ultimate R/C op-amp based equalizer with British roots. The PEQ-1549 includes HP and LP filter sections and a four band parametric EQ all squeezed into the 500 format. This EQ is nothing short of GIANT sounding with huge sound shaping capabilities.

9762A Preamplifer


The 9762 in now available in the 500 format! This is the original design with a 100Hz high pass filter added. We've also expanded the VU meter and improved the metering. Now you can get the same legendary 9762 sound in the popular 500 series module format.

UX410 Rack System


The UX410 is our heavy duty 500 Series compatible rack system. Each UX410 rack holds up to ten 500 series compatible modules and is powered by a heavy duty 1.5A soft start all linear mode power supply that delivers super clean power to all your modules.

The 9762 Dual Combo


The 9762 Dual Combo is our flagship preamplifier with legendary credentials and was our first product entering in the 1U rack space arena. The 9762 has gained respect over the years as a top notch preamp with solid features and superb sound quality. If your in the market for a high end preamp to enhance your recordings, give the 9762 a serious listen and you'll discover what legends are really made of!

What Some of Our Users are Saying...

"The RTZ line of preamps and eq's have jumped ahead of anything resembling my go to here at Slack Key Studio. With over 80 different colors of preamps from vintage 1930's to present day modern designs to choose from, the 9762/9762A, whether in 500 series or 19" rack, are the cream of my analog crop. Don't believe me? Try them for yourself as the proof is in the audio puddin'."
-Randy Kohrs, Slack Key Studio Nashville, TN

"The 9762 micpre is a game changer for me. It's the Swiss Army Knife of micpre's. I can't find anything it doesn't sound wonderful on. Percussion hits harder, bass more complex, acoustic guitars shimmer with tone and body and vocals....forget about it!!! Off the chain!!"
-Jimmy Heffernan, 5511 Music Studio

"I couldn't be happier with my RTZ 9762 mic pre. It's built like a tank and easily makes any mic I put through it sound great. It's really taken my home studio to another level. I use that thing for literally everything!!!"
-Troy Brenningmeyer, Troitone Productions

PEQ-1549 Demo Video

Nashville artist, producer and engineer Randy Kohrs has a Grammy and multiple nominations under his belt and makes no secrets about his passion and love for great sounding gear. Here Randy shares with us how to shape a guitar track for a mix using the PEQ-1549 parametric equalizer.

In this video, Randy demonstrates use of the HM and LM band sections as well as the HP and LP filter sections. Once the basic sound is shaped, he then demonstrates adding a little HM boost and some shimmer with the HF band.

Watch Video