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Palomar SL41 Technology & Design
This document highlights the design and engineering that went into the Palomar SL41 and why this
makes for a better performing microphone. If you have additional questions, please contact Palomar
customer support at 877-624-6869 or by email at info@palomarelectronics.com.
True Noise Cancelling Technology
The Palomar SL41 uses a custom-made noise
cancelling electret condenser microphone (ECM)
element.
Noise cancelling ECM’s are ported, or open, on both
the front and back sides of the element. Unwanted
background noise enters the front and back ports and
hits the mic diaphragm at the same time thereby
cancelling itself out. The user’s voice is both stronger
and closer to the front of the ECM, and enters the
front ports and hits the mic diaphragm before the
voice sound waves can reach the back ports of the
microphone element. This is the same noise
cancelling technology used by the military for use in
helicopters and other extreme noise environments.
Why Not Dynamic?
The simple answer is audio quality. Dynamic microphone elements do not have the sensitivity or gain
that a ECM element has. More sensitivity and gain makes an ECM sound better and louder over a
dynamic element. Since the SL41 has more gain and output than a dynamic microphone means you
no longer need to run your radio’s mic gain control wide open to be heard. The extra gain from the
SL41 allows you to turn down your radio’s mic gain and still be louder than a dynamic microphone
with the radio mic gain at full.
Super Long Life Battery.
ECM’s require a small amount of voltage to work and therefore the SL41 does have a single AAA
battery inside. The SL41’s circuit focuses on maximizing the battery life. Under normal operating
conditions, a single AAA battery will power the SL41 for 2 years! When it does finally come time to
install a new battery, this is as easy as removing 3 screws.
www.PalomarElectronics.com ● info@PalomarElectronics.com ● 877-624-6869
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Build Quality Feature
Palomar SL41
Astatic 636L
RoadKing RK56
Ranger SRA-198
Case Wall Thickness
0.165”
0.115”
0.105”
0.090”
Mic Hanging Button
Aluminum
Plastic
Metal
Metal
Mic Hanger
Aluminum
None
None
Metal
Internal Strain Relief
Metal
Metal
Plastic
Plastic
External Strain Relief
Metal Spring
Metal Spring
Plastic
Metal Spring
PTT Switch
Standard Large
Standard Large
Standard Large
Small
Circuit Board Material
FR4 (fiberglass)
None
FR-2 (paper)
None
Mic Cord Conductors
7 (5 + 2 shields)
6 (5 + 1 shield)
6 (5 + 1 shield)
4 (3 + 1 shield)
Mic Cord Finish
Matte
Gloss
Matte
Gloss
Weight
9.5oz
7.4oz
7.6oz
9.9oz
metal weights)
A look inside the
Built to Last
No expense was spared in making the SL41. Every part and component is top of the line, from the
massive PTT switch to the custom designed mic cord with dual shields. Our case uses more than 50%
the amount of impact proof ABS plastic as our competitors, which makes the SL41 feel as solid as it
sounds. Below is a chart comparing key build quality features between the SL41 and the competition.
Palomar SL41
(7.5oz without
www.PalomarElectronics.com ● info@PalomarElectronics.com ● 877-624-6869
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