Day: May 21, 2019

CD and CDL type basses for Lute and Baroque Guitar: main features, fields of use and correct installation procedure

Before approximately 1660, the lower strings in both plucked and bowed musical instruments were made in pure gut.

Up to this date there are two theories on this: the first believes that the gut strings were twisted in imitation of ropes used in the navy (increase in elasticity), while the second believes that the gut used for the basses was loaded using tanning techniques and then twisted.

We support this second option, that led us to produce the C type loaded gut strings, the production of which is currently still suspended.

Therefore, to solve this inconvenience, we designed the CD and CDL synthetic loaded strings (suitable only for plucked instruments).

 

CD strings

The CD type strings are synthetic strings used on the lower and medium basses on Lute and Baroque Guitar, characterized by a high standardized specific weight, achieved by loading  the synthetic material with metallic copper powder during the extrusion phase.

The surface is similar to the one of a rectified natural gut. The strings have a percussive and vocal tone, however their sound is full and blends perfectly with the paired string in octave. The working tensions remain unchanged compared to the usual playing habits.

The strings have an excellent tuning stability; they replace the modern wound strings that are too bright to fit the real nature of the Lute.

The CD type strings are also recommended for basses on short double-necks (like the  Liuti attiorbati or Archlutes, and the Swan Neck Lutes in minor D with max length = 105 cm)

The CD diameters thinner than 115 cm have only been partially loaded, in order to work best on the 5th course of the Lute and the 4th and 5th courses of the Baroque Guitar.

 

CDL strings

These type of strings are partially loaded basses with a length of 150 cm, specifically designed for basses with diapasons between 115 and 135 cm; an example are the historical Archlutes and the non-historical Theorbos with medium and short diapasons (suitable for travelling, and more common nowadays).

This is our answer to the inappropriate use of wound strings as basses on these types of instruments.

We restricted the length to 150 cm in order to avoid the use of such strings as basses on historical Theorbos (the correct strings for these intruments are gut strings or the synthetic NGE strings).

Please note: the human ear has a poor sensibility to the lower frequencies, so that on short distances one might think that these kind of strings will not have a sufficient acoustic energy as compared to wound strings that are perceived as more brilliant thanks to their harmonic richness (see the ‘Phon curves’). However the science of Phonometry shows that the lower frequencies are not dampened by long distances or sound-absorbing elements such as people, chairs or curtains. On the other hand, higher frequencies are greatly absorbed. As a result, a Theorbo using wound strings will not perform well on distances or sound-absorbing elements, while our CDL type basses will still sound great.

 

The correct installation

Both CD and CDL types are made with a synthetic elastomer that is characterized by the fact that it does not slide (that’s why elastomers are used for the soles of shoes). This implies that the common installing procedure does not work as expected, and might lead to unexpected breakages of the string: as a matter of fact, the poor sliding of the material  leads to a higher tension in the portion between peg and nut as compared to the tension between nut and bridge.

The CD type is very resistant in itself: just as an example, a 145CD string will break to a linear traction of 12 kg.

The correct procedure expects that the string, once fixed on the peg, must be kept constantly out of the nut groove during the whole initial tuning process, and it must be put back in the groove only once it has been pulled by hands and tuned up to the desired note.

This way the tension between peg and nut is the same as the one between nut and bridge, granting a high tuning stability and absence of breakages.

Using lubricants/graphite on the grooves of the nut has not proved to give appreciable benefits.