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One Violin, One Viola, One Cello, One Bass

Please Note: All cello modulators for sale are solely the slim model. The “regular”, wider version has been permanently discontinued.



The Krentz Modulator changes, rather than absorbing vibrations from the top of the cello. As a result, there is no depreciation in sound quality. Rather, the device actually increases the efficiency of the instrument, allowing the musician to subtly control important aspects of the instrument’s tone.

*In very rare cases, the handmade varnish made by a small number of modern makers is very soft and does not fully cure for years. This is likely not intentional. These instruments may develop a mark on their soft varnish. These marks can be French polished out, but further use of the Modulator is at the player’s discretion.

Designed to fit an f-hole with the following size:

Violin 8.3mm | Viola 9mm | Cello 14.1mm | Bass 22mm

Free Returns, Lifetime Warranty

Terms & Policies


To our vendors: All vendor purchases of the Krentz Modulators are for in-store sales only. Online sale of this product is not permitted on any website other than Krentz String Works.

Additional information

Weight 15 oz
Dimensions 8.5 × 6.125 × 6.125 in