We didn’t understand why ADL 1000's are mainly used on vocals so we purchased the one pictured awhile back and took some bench measurements to see if they might reveal anything.  The first thing we checked was the amount of gain reduction at different single tone frequencies.  A small amount of gain reduction (4 db) was noted at frequencies from 60 hz to 500 hz with a rapid fall off.  At 1 khz we measured a whole huge 1/2 db of reduction full up.  With normal operation a compressor sees and entire band of frequencies in program audio, not just a single tone.  The gain reduction is a function of the full spectrum of program audio.  However, even with a single tone the flatness of the gain reduction can be measured.  The gain reduction equalization wasn’t at all flat enough for us and the entire amount of reduction was also insufficient so we made a few changes.

We started by comparing every component in the box against that of the very successful LA-2A and found that our ADL1000 as built is a good low range compressor but doesn't react much to higher frequency content. To shorten a long story we made circuit changes that moved the design of our ADL1000 closer to the LA-2A with the goal of improving the overall gain reduction bandwidth and amount.   After several iterations of retesting, to our great pleasure, out came that warm smooth transparent even gain reduction everyone wants.

Our modified compressor was recently compared against an LA 610 (a Universal Audio product that combines a UA 610 mic preamp and the essentials of their new LA-2A reproduction).  I connected the LA 610 and the ADL1000 shown in this posting on each track of a 2 track stereo feed.  Set at about 10 - 15 db reduction they both reacted to peaks so closely the stereo image remained very steady even with no linking.  Only at extreme reductions of greater than 20 db did the LA 610 prove to be somewhat more stable than the ADL1000 with this modification. This is just a matter of how different they behave in squash pancake mode. I never go there.

If you want us to perform this modification on your ADL1000 we will duplicate our changes for your unit.   All you have to do is pay our modification fee plus shipping per this posting and send your ADL1000 to us and we will make the modifications for you.  Please insure the package when you ship as we cannot take responsibility for damage in shipping either way.  Your ADL 1000 will be insured when we send it back to you.  You must also get an RMA number from us and give us your unit's serial number before shipping your ADL1000 to us.   Turnaround time will be two weeks or less.  This purchase covers the cost of performing the equalization and compression gain reduction modification plus return shipping and handling.  No other work is included with this purchase however you will be advised if there is an observed failure of other components (bad tubes, caps, excessive noise, or a bad T4 element).  Look for our additional posting for product refurbishment if you want to have the whole unit refurbished.

Anthony DeMaria of Anthony DeMaria Labs has been consulted and is aware of the changes we have made.  He may elect to incorporate one or more of them in future units.  We are not aware that any ADL1000's manufactured prior to 11-07 have these changes.

Please Read This Carefully.  If you are not satisfied with the resulting changes the only remedy we can offer you is to restore the unit to its original condition and you will have to pay shipping again one way to have the work undone. We will pay return ship in the case of a modification reversal.  We cannot refund the price of the changes as the modification work has been performed and the performed again in reverse at no charge.

DUE TO PAYPAL POLICY - WE ONLY ACCEPT PAYPAL FROM CONFIRMED ADDRESSES.
BEING VERIFIED WITH PAYPAL IS NOT THE SAME AS BEING CONFIRMED.

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