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 New February 2010 review of the 20M in Stereo Times

"The NSM MasterSource 20M loudspeakers are nicely designed, solidly built, and eminently musical sounding performers. They throw a very nice soundstage with good speed and detail and are capable of good bass performance."

"Small Footprint, Big Sound."

"...the song that always does it for me is the classic, Cant Help Lovin Dat Man. Pianist Gene Harris performance is simply marvelous and I always want to stand and applaud every time his solo concludes.... The 20Ms ability to pull the listener into the performance is very important to this song."

"... very high-quality craftsmanship and tight tolerances in the construction."

"The tweeter actually showed incredible range, not getting hard or bright as the music became louder or more dynamic."

"The 20Ms ability to pull the listener into the performance is very important..."



Here is what one of the best audio mastering engineers has to say about the 20M and two 15 EXP subwoofer Armada System
"I purchased a complete 20M Armada system over a year ago which I use daily for audio mastering. This system has simply allowed me to get closer to creating a perfectly balanced master than I ever thought possible."
Kurt Lundvall, Lundvall Mastering

 

MasterSource by NSM Audio Model 20M Ambient Sound Monitor.

The 20M is a time coherent, point source, first order, two-way acoustic suspension loudspeaker system that is the result of years of research, innovation, and independent thinking, that have yielded many evolutionary refinements. As a result the 20M has exceptional ability to accurately reproduce music and to retrieve the ambiance of the musical performance.

As proof of the "rightness" of the design, few loudspeaker image as well as the 20M.

Several features contribute to the performance of the 20M. The 20M's combination of time coherent, point source, first order, two-way, acoustic suspension designs coupled with innovative cabinet and crossover designs and accurate voicing, make the Model 20M incredibly true to the source.

 

read review by
www.soundstage.com

 

print side one of PDF brochure
print side two of PDF brochure

 Model 20M
Ambient Sound Monitor
"No bookshelf speaker images better"

 
 Images better than Revel Performa M20
Images better than Mirage MRM-1
Images better than Merlin TSM-SE
Images at least as good as the JMlab Mini Utopia

"The 20M is a very different speaker ... because it uses a two-way coaxial driver from SEAS that looks like a single driver. The tweeter is mounted inside the woofer, right where the dustcap would normally be. ...The idea in creating a driver like this is so that the speaker acts as a point source -- in other words, as close to a theoretical ideal of radiating sound from a single area."

Technical Data:
Frequency Response:
54Hz-20kHz +/- 3 dB
-6dB: 47Hz
-10dB: 38Hz
Dimensions:
14 X 9 X10 (H X W X D)
Sensitivity: 85 dB 1 watt/m
Rated Impedance: 8 ohms
Recommended Power: 50-150 watts
Weight: 50 pounds per pair

 

As a result of its time coherent, point source, coincident driver array, the woofer and tweeter have identical acoustic centers and identical directivites at the crossover frequency. This produces a stable axiosymmetrical radiation pattern with smooth power response.This is further enhanced by a high quality minimalist four element first order crossover network.

The cabinet of the 20M is finished in real walnut wood veneer. It is elaborately braced and the rear panel is sloped two degrees to eliminate box resonances and colorations. Furthermore, the vertical edges of the cabinet are accentuated with exotic Peruvian walnut hardwood inserts that are rounded to prevent sonic refractions and to enhance the appearance of the 20M.

 

Special Features:
Magnetically shielded, time coherent, concentric, point source, driver array
Design:
Time coherent, point source, first order, two-way acoustic suspension
Drivers: concentric 6.5 in cast magnesium frame poly woofer, 1 inch soft dome tweeter
Crossovers: Copper inductor, film foil capacitor, non-inductive wire wound resistor
Connectors: Bi-wire/Bi-amp, five-way gold plated binding posts
Cabinet: Walnut veneered 3/4 inch braced anti-resonant medite board
Wiring: Silver plated copper to tweeter, multi-strand copper to woofer, inductor is wired directly between woofer and terminal
Fasteners: Hex fasteners



 1 pair MasterSource Model 20M walnut

 1 pair MasterSource Model 20M walnut

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 e-mail: nsmaudio@nsmaudio.com    Phone: 919-244-8777    Fax: 206-339-9034
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