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previous: Mark Hammer For a little over a year now, I've ... -- 1126703360 View Thread

Re: Modify a Reverb Pan??

9/14/2005 7:50 AM
R.G.Re: Modify a Reverb Pan??
That's a good approach to getting a DIY reverb working, OK.  
Here's a few things to think about:  
- the delay time is determined by the length of spring, of course.  
- the decay time is determined by the damping on the spring. Think of delay as how big the room is, and decay as whether it's all hard concrete walls or there's a lot of rugs, furniture, people, etc. there to soak up sound energy.  
- Accutronics springs are damped by a plastic plug inside the tube where the spring is soldered. The composition, size, placement, etc. of the damper is CRITICAL to the sound of the reverb pan.  
- Any exernal damping on the spring itself will reduce decay, but the amount of damping needed is infinitesimal.  
- Lushness in reverb sound is a result of the density of modes - that is, the sheer number of different bounce times. Pipes are single-mode things, and that's one thing that contributes to the "pipey" sound. Simple prings are also single mode. That's why spring tanks always have more than one spring. It's also why the springs on the fancier ones are split in the middle - it adds a discontinuity, and a mode. Two spring units with splits in the middle are four modes. Three spring units with splits are six mode units, and begin to sound pretty good. Studio plate reverb units have many, many modes because of the number of ways sound can travel and bounce. This accounts for the lushness of a plate reverb. Unfortunately, the plate needs to be about 4' by 6' to get there. Bigger is better.

woodyc Mark, I'd encourage you to make goo... -- 9/14/2005 10:01 AM