This has different sound improving ability than existing metallic resonance bell.

Description  : 

    1. Size(mm, approx.) : Large ---> Mpingo Bell Φ21 x 14H, Bubinga Base 16H x 25W x 23L.
                                        Small  ---> Mpingo Bell Φ13 x 12H, Bubinga Base 13H x 18W x 16L.

        Size(inch, approx.) : Large ---> Mpingo Bell Φ0.83 x 0.55H, Bubinga Base 0.63H x 1W x 0.9L.
                                         Small  ---> Mpingo Bell Φ0.51 x 0.47H, Bubinga Base 0.51H x 0.71W x 0.63L.

    2. Wood species :

       -. Bell : Mpingo (African Blackwood, Botanical name : Dalbergia melanoxylon)  
                        Mpingo is well-knowned already with its outstanding resonance ability.
       -. Base : Bubinga (Botanical name : Guibourtia spp.), African premium hardwood.

Structure : 

   -. Combined the bell with a bolt in tap formed on the base. 
         As a stopper for stronger firmness, it is used a contraction tube between the base and bolt.

    -. It has thin thickness as possible to get optimal resonance effect with maintaining the solidity.

    -. The Mpingo bell has uniform thickness as possible by advanced-level woodturning handmade
        skill, and so realized unique resonance effect of Mpingo which are different from metallic bell.

    -. Bubinga base has 2mm diameter through holes on front-to-rear face & left-to-right side for 
       maximum resonance ability. 
       It is very hard and poor work efficiency to process Φ2mm through hole straightly on Bubinga 
       hardwood of height 27mm(Large) & 20mm(Small). 
       It's curve also made by advanced-level woodturning handmade skill.

Product feature :
                   
   1) Finishing : 2~3 kinds of premium German natural oil applied on fine-sanded surface.
    2) Material quality : This is made with sound squares very strictly selected from 5~7 years
                                    air-dried blocks in Korea after import from East Africa.
    3) There are some distribution of wood grain & color in part due to natural material.


Application : 

    (Below is very famous audiophile’s review introduced on widely known audio site in Korea.
     He used Mpingo reso-bells for a long time, and finally found optimal application directions.
      As a result, they conducted group-purchase that many members were participated.
      We hope this should be help to your purchasing and application.)

    "Mpingo reso-bell is perfect match to calm down the noisy treble.
     Midrange is becoming rich, and bass volume also can be increased.
     Mpingo reso-bell should be used 2pcs basically.
     It can be get simply by gluing Mpingo reso-bells on back wall of speakers.
     We recommend two major position to attach on.

1. First positioning :  ※1 case (above photo).

     When looking at the speakers from the front, you attach them to a slightly higher places than
      twitter.  Then treble become tone soft, but it doesn’t feel to be cut off.
      As grain of sound goes out, the luster of female vocal or violin sound goes to liquid.
      Sound image become arranged neatly and so imaging or focusing become better.
      But, it does not feel brilliant like the metallic resonance-bell.
      If you have metallic resonance-bell, it is worth to use both.

2. Second positioning : ☆2 case (above photo).

      You attach them to the height before and after 10cm from the floor.
        It is to attach on back wall, not on speakers.
       This is favorite positioning personally, and it makes clear the whole sound to realistic and
       analogue.
       The imaging is arranged like as finely grinded surface by sandpaper from rough susrface. 
       Sound balnace become sink than First positioning.
       This Second positioning took the tests on total 7 different condition places, and almost cases
     showed good effects except only one place.
       Perhaps the most general home environment, it can be sure it will be a definite benefit. 

 3. Size : Large and Small.
              
      Their effect are similar, but the change variation of large model is wider.
       The choice is depend on loudness that you listen in usual.
        If you listen loudly, the small model can be recommended.
        If you listen low volume relatively, the large model can be recommended.
        Also, it is better to choose the large model in case that space area is over approx. 33m2.

 4. Other tips :

      1) Bubinga base has two flat surface, one side of 2holes and the other side of 3holes.
           Depending on which side to the front position, it brings subtle differences in volume sense
           of base and size of sound image.
           As practice test results, the likes and dislikes are changed depending on the environment.
           Therefore, you have to make your own choices.

      2) The Reso-bell can be lay down horizontally, besides standing upright.
           But, this case is not recommendable as the sound goes down too, if not special environment.

 5. Most audiophiles have their own opitmum loudness according to the space. 
      Also, it must be tuning after setting the opitmum loudness. 
      If the listening environment is very low volume like BGM(background music), the Reso-bell can
      not do little its role and do not buy it."

Buyer's review :

  1) "I have used resonator items of 'Synergistic Research' and 'Acoustic Revive' fullset together.
        If you have sound distress of bustle etched midrange and treble, these resonator brings a clear
        improvement.
        Alteration of bass is clear, and especially the exess and turbid midrange-bass become much improved.

       The setting point may vary upon system and room environment.
        I used 2 pieces large and 3 pieces small as one set.
        It become better by setting with one large on lower and one small on upper at corner of rear speakers.

        It seems proper setting point that approx. 30cm height from the floor and 50cm height from the twitter.
        One small remained set on wall center of rear speakers with twitter height.

        I could felt change enough to upgrade to premium vacuum tube amp only with these setting.
        It would be nice to look for optimal setting point according to each environment and taste."

  2) "Metallic resonance bell have sound diffusion ability, but there were some complaints in view of
       calm. I keep on using them as I become bored by putting them away.

       I set Mpingo reso-bell with each small on left and right side of treble and one large on mid-base.
       As result, it could be covered the disadvantages of metallic bell by cooling off."

  3) "In rectangular room, I installed total 3 pieces, 1 piece on front side and each pieces of both sides
       wall. The effect is pretty."

  4) "Thank you for including the Large Reso-Bell.
       I have found that I can change my soundstage or stereo image with one Small Reso-Bell.
       I listen primarily to classical music. My stereo system is located along the long wall in a
       rectangular room.

      The right side is much closer to one end of the room. The wall on this end is covered in windows.
      As a result, I have a problem with not having an even stereo soundstage or stereo image.
      A typical problem that I have is the image of the violins on the left side is not wide enough.

       I have used Blu-Tak to stick the Reso-Bell to the wall behind the left speaker to increase the
      soundstage left of the left speaker.
       I also have found that I can increase height of the soundstage by raising the bell.
       I am amazed how effectively the small Reso-Bell can move the image up/down or side to side."
       (16 Apr.2012, from D.J. USA)

   5) "I am very happy by the way with my Mpingo reso-Bell and I just cannot understand 
       how something so small can influence the sound from my floorstanders but it does.
       It must have taken a lot of research to develop them into viable products so I applaud 
       whoever thought of the idea. Best regards, John. from UK 2015.1.31." 
       (This buyer have bought large one pair & small one pair.)

Application in car audio : by car audiophile customer.

Caution :

    Please do not drop down to hard floor or apply excessive force as bell's thin thickness.

About material  :  African blackwood (Mpingo)

       -. Mpingo : Swahili name of African Blackwood ( Swahili : East African local language)
                          Botanical name : Dalbergia melanoxylon
                          Density(air-dry) : 1.3 

        -. African blackwood listed by CITES as a protected wood since Jan. 2017.
           (CITES : Convention on International Trade in Endangered Species of Wild Fauna and Flora)
           But, all our raw materials of this wood species were imported in Korea legally from Tanzania on 2002~2004.
           Please refer above photo of official 'Pre-Convention Certificate' issued by Korea government CITES authorities.

        -.  Mpingo is much different species from Ebony wood. 
                  Ebony : Botanical name : Diospyros spp. (Ebenaseae), about 200 kinds of species.
                               Density(air-dry) : 0.9~1.0 

        -.  Mpingo is renowned for its lots of defects like cracks, splits, knots, worm holes, etc. 
            in the log itself, and so result in very poor cutting yield ratio to certain size.

        -. Acoustic properties : 
              Its stability and lovely tonal qualities make it well-knownd as "The Tree of Music"
             and it has often used for woodwind musical instrument traditionally like clarinets, 
             oboes, bagpipes.
             Also, Mpingo is recognized already as outstanding resonant accessories to high-end 
             audiophiles worldwide.

                   Don't miss your chance to enjoy more improved sound!