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Overview 

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Because the conductor of a planar magnetic driver is essentially a long, thin wire, it 
presents a purely resistive load to the amplifier.  This is comparable to the simple 
test loads that amplifier companies use when measuring their amplifiers to show 
how terrific they are.  As such, you can be assured that your amplifiers will sound 
and work their best.  

Authoritative, deep bass requires that you move a lot of air.  We have chosen to 
use dynamic woofers for the bass because they can provide excellent performance 
at lower frequencies.  

In order to get comparable bass performance from a planar magnetic design, you 
would need to have a huge speaker that would be impractical in most domestic 
living spaces.  It simply makes more sense to use the best transducer technology in 
each area of the reproduced spectrum.  One of Wisdom Audio’s strengths is in 
seamlessly blending these technologies — particularly important given the high 
standards set by our planar magnetic drivers.  

Of course, the dynamic woofers themselves must be rather extraordinary in order 
to “keep up” with the planar magnetic drivers right up to the crossover frequency.  

Our woofers are different because they must be in order to do their job.  
Specifically, we need highly dynamic, uncompressed bass (to keep up with the 
planar magnetic drivers) that does not depend on a critical amount of enclosure 
volume (since these speakers are mounted in your wall, and use the space inside 
the wall as their “enclosure”).  These two design goals require rather extraordinary 
attention to myriad details.  

The motor and suspension system of these woofers therefore includes all the critical 
damping required for optimal operation.  (In most speakers, the woofers depend on 
the air trapped inside their enclosures as an additional “spring” to help them 
behave properly.)  Technically, this approach is known as an “infinite baffle” 
design.  In practice, the volume of air behind the speaker does not have to be 
infinite, of course.  It just needs to be large enough to not act like an acoustic 
“spring”.  Recommended and minimum enclosure volumes for the speaker are 
listed in the Specifications section, and repeated on the Dimensions page.  

Many speakers include a mid-bass “bump” in their response to give the illusion of 
going deeper in the bass than they actually do.  Unfortunately, this “bump” makes 
blending them seamlessly with a high quality subwoofer almost impossible.  

All Wisdom Series speakers have been designed for optimally at response to 80 Hz, 
which is the most-common crossover frequency used with subwoofers.  

Summary of Contents for Wisdom Series LS4m

Page 1: ...1 Owner s Manual Wisdom Series LS4m Bi amplified Coaxial Planar Magnetic Loudspeaker ...

Page 2: ...loudspeakers It is important to read this document before attempting to use this product Pay particular attention to WARNING Calls attention to a procedure practice condition or the like that if not correctly performed or adhered to could result in injury or death CAUTION Calls attention to a procedure practice condition or the like that if not correctly performed or adhered to could result in dam...

Page 3: ...systems We know that the extra effort particularly as regards setting up the SC 2 and SC 3 System Controller yields vastly improved results This manual focuses on the loudspeakers themselves In order to fully understand the system we recommend you also review the manual for the SC 2 SC 3System Controller without which these speakers will not perform correctly While we expect your local Wisdom Audi...

Page 4: ...eal of power The voice coil is laid out at and is exposed to the air on both sides the large resulting surface area dissipates heat extremely quickly and efficiently Since heat does not build up in the voice coil as it does in conventional dynamic drivers the load seen by the amplifier does not change at high power levels When you become accustomed to the sound of your new Wisdom Series LS4m speak...

Page 5: ...ecause they must be in order to do their job Specifically we need highly dynamic uncompressed bass to keep up with the planar magnetic drivers that does not depend on a critical amount of enclosure volume since these speakers are mounted in your wall and use the space inside the wall as their enclosure These two design goals require rather extraordinary attention to myriad details The motor and su...

Page 6: ...ine source speakers provide two significant advantages Ceiling and floor reflections are minimized resulting in greatly reduced interference letting you hear more of the speaker and less of the room The sound pressure level SPL throughout the room is much more evenly distributed making it much easier to set the right volume no matter where the audience is seated To achieve this highly desirable li...

Page 7: ...packing your LS4m to ensure that you do not strain yourself from its perhaps unexpected weight 1 Remove the torx screws from the hinged lid of the crate with the supplied torx bit which can be found in pouch on top of crate 2 Use the included cardboard template to trace the outline of the hole for the speaker and carefully cut to the line 3 Carefully lift the LS4m from its crate and place back sid...

Page 8: ...set the LS4m speakers as Small in the speaker setup portion of your processor s setup menu Doing so ensures that all content below 80 Hz is directed to the subwoofer s for reproduction Care Maintenance To remove dust from the front of your LS4m use a feather duster or a lint free soft cloth To remove stubborn dirt and fingerprints from the grille we recommend isopropyl alcohol and a soft cloth Lig...

Page 9: ... not performing satisfactorily may be returned to the factory for evaluation Return authorization must first be obtained by either calling or writing the factory prior to shipping the component The factory will pay for return shipping charges only in the event that the component is found to be defective as mentioned above There are other stipulations that may apply to shipping charges There is no ...

Page 10: ...ir the difficulty as quickly as possible A copy of the original bill of sale will serve to verify warranty status Please include it with the unit when it is brought in for warranty service WARNING All returned units must be packaged in their original packaging and the proper return authorization numbers must be marked on the outer carton for identification Shipping the unit in improper packaging m...

Page 11: ...uency 750 Hz Nominal Impedance 4 25Ω per section Sensitivity 100 dB 2 83V 1m Power handling peak 5000w Dimensions see appropriate dimensions drawings on next page Shipping Weight 550 lbs 250 kg For more information see your Wisdom Audio dealer or contact Wisdom Audio 1572 College Parkway Suite 164 Carson City NV 89706 www wisdomaudio com information wisdomaudio com Ph 775 887 8850 ...

Page 12: ...12 LS4m Dimensions ...

Page 13: ...istered trademarks of Wisdom Audio Wisdom Audio1572 College Parkway Suite 164 Carson City Nevada 89706 USA Telephone 775 887 8850 Fax 775 887 8820 www wisdomaudio com LS4mOM 2 0 1 2018 Wisdom Audio Inc All rights reserved Printed in U S A ...

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