Don Classic Relaunch with Quantum J Audio 250EQ 500 Series

[Quantum J Audio]

Available for Pre Order - Don Classics designs are back with this faithful recreation of the Sontec MEP-250A in 500 series and 51X package.

• Full Kit comes with high quality components and hardware for build
• Board mounted pots with one ribbon cable connection for ease and speed of assembly
• Dual concentric pots allow greater space on front panel for ergornomics and of dialing in the EQ.
• Centre notched cut/boost pots, easily zeroed if band not required.
• Can run on standard 500 series 16v or 51X 24v
• Standard kit comes with IC's, can use discreet op amps.

Authentic recreation of original circuit

• 5 fully parametric bands with custom made dual concentric pots.
• ±12db of boost and cuts (boost and cut can be altered with a resistor change per band)
• 15 Hz – 25 kHz frequency range
• Polystyrene capacitors on EQ bands
• 2 op amp servo circuit per filter with trim pot for precice elimation of DC offset
• Available assembled or as a full kit

Normal kit price £495 / $615, pre orders for forum members 15% discount £420.00 / $492

Website coming soon. Limited quantity in first batch, DM me to reserve. World wide shipping.

Lead time 6-8 weeks for dual concentric pots to be custom made.

Great video from @shoetique



NV73, NV73EQ, U76 rev A and D coming soon.

Background on Don Classics and Quantum J Audio

Dave from Don Classics was my engineer back when I worked at Metropolis Studios London. After I went freelance, we found ourselves missing the high-end gear we had been using, but didn’t always have the studio budget to match.

We started building our own gear. Our first build was a Gyraf SSL clone, and it opened our eyes to what was possible. From there, Dave took things to another level with his own designs, and the 250EQ came from our need for a solid mix buss EQ. When Dave handed me the first prototype, I fell in love with it.

Why the 250EQ?

There are only a few EQs I trust for the mix buss: the GML 8200, the Manley Massive Passive, and the 250EQ. It holds its own in that company.

Recent uses of the Don Classics 250EQ on mix buss and channel duties.

• Kristen Wiig's "Harper and Will Go West" (featured in the Will Ferrell documentary)
• The forthcoming "Weekends With Adele: Live in Las Vegas"

 

[canidoit]

Hi Quantum, is this stereo unit? Thank you.

 

[Quantum J Audio]

Hi Quantum, is this stereo unit? Thank you.

This is a mono unit, pots are non linear, so it is impossible to make an exact match between left and right when single mutligang pots are used across a stereo source.

With a dual mono configuration any descrepencies can be corrected to closely match the left and right units. That's one of the reason why stereo configured EQ's like the sontec 250 or GML 8200 are dual mono.

I used to use a tone at various frequencies to align left and right over a stereo source. However this is even easier these days with plugins that show your EQ curve.