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Impact Resistance

Days after the 1994 Los Angeles earthquake, Mackie Designs compact mixers had been dubbed "Mackie Throw Pillows" by San Fernando Valley studio owners who had begun the painful process of cleaning up. Why? Because CR-1604s and MS1202s had survived being hurled clear across studios. They'd taken the full impact of falling monitor speakers without so much as a broken knob. Several were even buried by collapsed ceilings, only to be unearthed, tested and declared in perfect working order.

CLUNK! Scrunch! @#%&*$%!

Many other mixers make three mechanical design mistakes that can lead to expensive repair bills. First, they use un-sealed potentiometers containing brittle phenolic as a base for the potentiometer's wiper. Next, they mount the pots on vertical circuit boards. Finally, many mixers have pots whose bushings extend through chassis holes. This is a deadly combination when something heavy drops on the mixer.

When downward force is exerted on this kind of knob, all of the shear force is transmitted to the control and circuit board solder connection. Even if the phenolic material inside the pot doesn't crack, the whole thing can still get yanked off the vertical circuit board or break electrical contact. If a number of knobs get bashed from above at one time, the repair bill can be hefty.

Our mixers head off all three design errors.

Mackie's first line of defense against external damage is right there, in the knobs. They're designed to "ride" just thousandths of an inch from the metal surface of the mixer chassis. When downward force arrives, it is transferred from knob to steel – instead of from knob to potentiometer.

Next, we employ a co-molded potentiometer that doesn't use brittle material at critical mechanical points; if the mixer really gets whacked, our knobs withstand far more abuse than regular ones.

Finally, to eliminate force transferred to the circuit board, we use a braced, horizontal circuit board and shock-absorbing structure. The board is thick fiberglass and is connected at regular points to the chassis by metal stand-offs. Ultimately, extremely brutal knob impact is absorbed by broad pressure on a tough circuit board instead of acute stress at a few solder joints that weren't meant to take physical abuse.



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