Two Delay units used to make stereo a Spring Reverb

I'm the lucky owner of a vintage Eagle Products Spring Reverb. It must be quite a rare device as Google knows nothing about it. Its sound is very typical but the possible settings are nearly zero.

Eagle Products Spring Reverb

Another weakness is that it's mono and since reverbs are used to widen the stereo image this makes it unusable to mix a song.

In my rack two Digital Delays that I had for free from friends were collecting dust: a Roland SDE-1000 and a Roland GP-8. Same brand, so they should sound similar...this is perfect for what I had in mind...

Roland GP-8
Roland SDE 1000 Digital Delay

Phasers, Flangers, Reverbs, Echoes are always delays with different settings. In fact with about 20ms of delay and a bit of feedback a delay becomes a sort of reverb. With this in mind I ran a splitted cable out of the spring reverb so to feed the same mono signal into the two delay units configured as reverbs but with slightly different delay times. The resulting signals going back to the mixer were pan-potted to about 90%. Here I should have worried a little about phase correlation problems when processing low frequency material but I just didn't mind since I always center anything below 150hz when finalizing for vinyl.

Finally, I shaped the L+R return with a little EQ and the result is a lovely stereo effect!


  • Eagle Products Vintage Analog Spring Reverb

  • Roland SDE-1000 Digital Delay

  • Roland GP-8 Guitar Effect Processor

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