Alex's Attenuator Reactive Load Attenuator - Used  From Other

Now known as the Scumback DBL, Alex's Attenuator is a well-known and reliable circuit.


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What We Think

Condition: Used, Very Good

A great, well-known speaker tamer.

Manufacturer's Description from Other

With my attenuator the speaker impedance is not critical and here is why. As long as the amp matches the attenuator and you don't bypass the attenuator the impedance will be closer than you might think. At the most minimum attenuation level -3db using an amp set at 8 ohms and using an 8 ohm attenuator and a 16 ohm cab your amp will see less than 12 ohms. At -6db the amp will see 10 ohms, at -9 db it will see 9 ohms, at -12db it will see 8.5 ohms nearly a perfect match with a 16 ohm cab. The math works the opposite way as well so if you use a 16 ohm attenuator and the amp set to 16 ohms and an 8 ohm speaker with the attenuator set at -3db the amp sees 12db. At -6db the amp will see 14 ohm, at -9 it will be 15 ohms, at -12 it will see -15.5 ohms and the farther you turn the volume down the closer it gets to 16 ohms. The reason is the attenuator is taking a larger and larger percentage of the load as the volume is turned down and it gets closer and closer to 16 ohm. Another thing to remember that the impedance rating is not fixed it fluctuates. That rating is arbitrary for comparison purposes. And only reads the rated impedance at 400hz. The actual impedance fluctuates from 6 to 80 ohms on a 16 ohm speaker depending on the frequency. Now what is important about this is the amp is constantly affected by this altering impedance and that is what is meant by a reactive load and why a reactive load sounds much more natural than a resistive load.

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Here at Sound Pure we hand-select used and vintage pieces of gear for our inventory. Our used selection always reflects the high standards of quality and craftsmanship that we expect from all of our manufacturers.   We are a small team of dedicated experts, located in Durham, NC.  We buy, trade, and consign instruments that we truly believe in.  Because of this, we have developed a reputation of quality and trust with our customers, located all over the world.   Our best customers are the ones that truly understand our personal touch and commitment to everything we sell, and range from hobbyists and enthusiasts to some of the biggest names in the business.  Our passion bridges the products we love with the real relationships we develop with our customer - whether they are a lifelong musician, or they are just getting started on their musical journey but care about value, quality, and being treated right.  

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Sound Pure's inventory is constantly changing, ever-evolving, with some items sold before reaching the website.    Looking for something specific? Have questions about this product's condition or history?  Want more photos, or to simply chat with an expert who's had his hands on this actual piece of gear?  It is truly our pleasure to talk with our customers, please do contact us now.