Photo 1
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Where it is necessary to amplify the violin beyond the levels that can be achieved by using the omni-directional capsule system then it is suggested that the special version of the Accusound Contact Microphone be used. In this device the working element is a piezo strip of negligible weight which does not affect the performance of the instrument. Photo 1
The amplified sound is very near to the natural sound of the instrument since what is being reproduced is the vibration of the sound-board of the instrument. The sound level that can be achieved is limited at the point where the soundboard itself starts
vibrating to the amplified sound. Separation is not likely to be a problem since the instrument soundboard will not readily respond to direct sound from adjacent instruments - even a bass drum!
The problem in attaching such a device to the surface of a violin is that any form of double-sided adhesive tape - even one using removable grade - would carry the risk of damaging the varnish. The very low mass of the device makes it possible to use a strip of plastic material which will maintain a stable position on the sound-board to which the contact microphone can be then be attached using special differential tack double sided (D/S) tape. The procedure is to take a piece of D/S tape just longer than the microphone and attach it to the plastic strip. Remove the backing paper and place the plastic strip on the violin body as shown in photo 2.
It is essential to ensure that the surface of the instrument is very clean otherwise the plastic strip will not remain in position on the surface. When this has been done the microphone can be placed on the D/S tape. The LEMO socket is now placed in the clip attached to the tailpiece.
A LEMO socket is mounted in the end of the gooseneck remote from the capsule and the lead to the phantom power adapter is connected at this point. There is a helpful knack for removing the lead without disturbing the attachment of the gooseneck on the tailpiece. This involves gripping the socket and the plug in each hand whilst pressing the tips of opposite first fingers and thumbs together — a gentle squeeze will then separate the plug from the socket. Photo 3
The lead from the capsule can be hard wired or removable using LEMO socket and plug. The lead can then be connected to the amplification system via a phantom power adapter (the adapter has a small window which gives access to two slide switches, one giving a 10db pad, the other giving a Bass roll-off) or can be used with any wireless system. |
Photo 2
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Photo 3
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