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7. Protection 

 
Limiters 

 

Peak Limiter  

The Subwoofer, Midbass and Tweeter channels have  individual Peak Limiters designed to protect each 
driver from high amplitude, short duration audio input signal spikes that might cause damage due to 
over excursion of the voice coil.   These limiters are implemented digitally within the DSP in such a man-
ner that they have zero effect on the audio signal below their thresholds.   The front LED indicator light 
will flash RED when a Peak Limiter on any of the driver channels is triggered.   The duration of such 
events is only a fraction of a second.   Therefore, the LED flash may appear pink or orange as the eye 
naturally blends the normally aqua-blue color of the LED with the red.    
 

RMS Limiter 

The Subwoofer, Midbass and Tweeter channels have  individual RMS Limiters designed to protect each 
driver from long duration, high amplitude audio input signals that might cause thermal damage due to 
the voice coil.   These limiters are implemented digitally within the DSP in such a manner that they have 
zero effect on the audio signal below their thresholds.   The front LED indicator light will flash RED when 
a RMS Limiter on any of the driver channels is triggered.    
 

Caution:  

Signals large enough to trigger any of the limiters can generate very high sound pressure levels 

that may result in permanent hearing damage.    

 

Over Current 

 

In the event of a large audio input signal that might damage the amplifiers or power supply due to cur-
rent overload,  the power supply is designed to enter into Over Current protect mode.   This state typi-
cally results from a large, broadband input signal burst that flat lines the limiters on all four channels 
simultaneously.   While the fault persists the amplifier power rails shut down, the speaker goes quiet, 
and the front panel  LED turns red.   Once the audio input signal is turned down the speaker should re-
boot within a few seconds.   If the speaker fails to reboot or the LED light goes out completely, discon-
nect the audio input cable and power cycle the speaker.   Verify the signal level is attenuated before 
reconnecting audio input cable.    
 

Caution:  

Signals that cause Over Current protection to trigger can generate very high sound pressure 

levels that may result in permanent hearing damage.    

8. Positioning  

 

The acoustic center of the MicroMain27 Gen2 is located at the center of the tweeter.  The MM27 Gen2 is 
designed to work equally well as a nearfield or mid-field monitor.   The minimum recommended listening 
distance is 1 meter (39.4”).  While speaker positioning can sometimes be dependent on the nature of the room, a 
good starting point is to create an equilateral triangle between the two speakers and the listening position.   The 
speakers should be angled inward approximately 30 degrees so the tweeter axes aim towards the listener’s ears, 
crossing a few inches behind the head.    
 
When the speakers are standing vertically, the “Barefoot” text on the front faceplates of both speakers should be 
on top.   When the speakers are turned on their sides to the horizontal orientation, the “Barefoot” text on the 
front faceplates should be towards the outside.   This places the ’bottom’ midbass drivers towards the center of 
the stereo field.     

Summary of Contents for MicroMain 27 Gen2

Page 1: ...Owner s Manual ...

Page 2: ... Gen2 is a 3 5 way active loudspeaker capable of nearfield mid field and far field operation The five drive units are all housed in sealed enclosures The DSP controlled four way power amplifier module can deliver 500 Watts continuously The system accepts either analog or 24 bit 192 kHz digital audio signals Cutting edge MEME Multi Emphasis Monitor Emulation technology enables the MicroMain27 Gen2 ...

Page 3: ...an ungrounded mains power cable or a mains connection that is ungrounded This may result in personal injury Do not place open flames such as lighted candles on or near this device Do not expose this device to water rain or high humidity Do not place objects filled with liquids such as vases on or near this device This speaker requires adequate airflow to maintain proper cooling Do not obstruct air...

Page 4: ...arries both left and right audio signals For stereo or multiple speaker operation the monitor output sig nal must be assigned to two or more AES3 output XLRs within the DAW Otherwise a passive AES splitter or an active AES distribution amplifier is required to deliver signal from a signal from a sin gle AES output XLR Use the CHNL switch on the back of each speaker to select appropriate left or ri...

Page 5: ...als also set the Channel toggle switch to left L or right R in accordance with the speaker position 3 Ensure that the audio signal is fully attenuated AES3 signal requires digital attenuation 4 Power on the speaker with the rocker switch located on the rear panel above the mains connector The LED indicator on the front of the speaker will illuminate Red for a couple of seconds then turn Aqua 5 Tur...

Page 6: ...Midbass Sub Woofer Amplifiers DACs Limiters Sub Level Crossovers and MEME Input Level ADC 24bit 192kHz Receiver 24bit 192kHz ANLG AES3 INPUT CHNL LEVEL VOICE SUB Clip LED 6 Signal Flow Diagram MEME Voice Selector Switch ...

Page 7: ... is designed to enter into Over Current protect mode This state typi cally results from a large broadband input signal burst that flat lines the limiters on all four channels simultaneously While the fault persists the amplifier power rails shut down the speaker goes quiet and the front panel LED turns red Once the audio input signal is turned down the speaker should re boot within a few seconds I...

Page 8: ... must be dissipated This heat is transmitted to the air via the rear amplifier plate heat sink and the subwoofer cones In order to ensure proper airflow a minimum of 5 127mm clearance should be maintained between the speaker and any large obstructions An ambient temperature below 30 C 85 F should be maintained Over temperature may cause speaker to overheat and shut down BAREFOOT text BAREFOOT text...

Page 9: ...ng translation Setting has a flat frequency response and extremely fast transient response This is the default voice when the Voice Selector Switch is not connected Hi Fi While it does not emulate any one speaker in particular this setting is indicative of hi fi in the colloquial sense of the term The midrange is a bit scooped and highs are little accentu ated The bass response is altered to have ...

Page 10: ... simple Newtonian action and reaction As the driver motor magnet and voice coil forces the cone to move back and forth in order to generate sound the cone exerts an equal and opposite force on the motor This force is transmitted through the driver frame to the cabinet vibrating the cabinet walls and coloring the sound emitted by the cone This effect is most especially prevalent in the low frequenc...

Page 11: ...d by a qualified technician or by the Barefoot Service Center There are no user serviceable parts inside this product 12 Handle Attachment Each MM27 Gen2 is supplied with two handles The handles are useful for lifting and positioning the speaker The handles can also be used as base skids for mounting the speaker in the horizontal orientation Caution the handles should never be used to suspend the ...

Page 12: ...13 MicroMain27 Gen2 Frequency Response dB SPL at 1 meter free field 15 dBV input attenuator 0db 11 ...

Page 13: ... function as lateral cabinet bracing Long fiber wool acoustic damping throughout Crossover Frequencies 100 600 3000 Hz Tweeter 1 ring radiator with Advanced neodymium motor Rear waveguide chamber Amplifier 250W Hypex Midbass 1 5 25 poly paper cone with Advanced neodymium motor 5 mm linear excursion Amplifier 250W Hypex Midbass 2 5 25 poly paper cone with Advanced neodymium motor 5 mm linear excurs...

Page 14: ...13 13 Drawing ...

Page 15: ...y or unsuitable ancillary equipment accessories or options are fitted at owner s risk Barefoot Sound warrants all service repairs and replacements for 180 days from the date of return to the customer owner This warranty specifically excludes unrelated additional defects or failures Otherwise the same general provisions of the limited product warranties apply Technical Support and Service For warra...

Page 16: ...uld engage the threaded inserts and begin to pull the bracket snug against the speaker cabinet If the bolts are too long and bottom out before the bracket is snug against the speaker cabinet STOP You may have the wrong size bolts Contact Sound Anchors Barefoot info barefootsound com or your dealer for the correct size screws 2 Secure the speaker mounting bracket to the stand at desired height 3 At...

Page 17: ......

Page 18: ...Barefoot Sound LLC http barefootsound com 2013 ...

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