Here are a few photos of my two Ceccherini bowlbacks, one with a conventional single top (below), which I've had for a few months, and the other with Ceccherini's unique double-top design (above), newly-acquired this week and now cleaned and set up. The second top is suspended about one centimetre below the main top, similar to a Virzi. It's a wafer-thin spruce plate with the grain running at right angles to the main top. It's stiffened by and suspended from two braces running at an angle to the strings so that they form a jaw opening towards the soundhole and coming closer together towards the tailpiece (although they never cross or even get particularly close to each other).
With the single top, there is a tensioner similar to the more common de Meglios, whereas the double top goes with four brass hooks holding the strings down. I had envisaged that the hooks go down to the second top, helping to drive it. However, from feeling the underside of the double top, that doesn't seem to be the case.
Interesting to note that the single top Ceccherini has a significantly smaller sound box: it's about seven millimetres narrower and about one centimetre more shallow.
Martin
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