Ahh yes the birch. Traveling to the shady part of town because their lumber yard was the only one with birch was fun
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Aint those genelec cabinets aluminium ?
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Cabinet materials have been debated to death… they all have their pros and cons. Just one of those audiophile, gotta-refine-everything, sort of deals.
I respect folks wanting to go for the most accurate sound… but what’s the fun in that? 
Cool folks over at DiyAudio have been playing around with foam board speakers for years. Some of their measurements are pretty freaking awesome.
edt: Should probably say, I use foam because I like to experiment with enclosures. Super cheap and saves time, and you can do some wild stuff. I’ve woodworked extensively before, but foam is just fun. Many folks do it so they can test enclosures before making wooden ones.
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Yes. Speakers are aluminium and subs have some MDF.
Genelec products use two main types of enclosure materials: aluminium or MDF (Medium-Density Fibreboard).
Aluminium is an excellent material for loudspeaker enclosures: its low density and stiffness produces lighter enclosures with thinner walls than is possible with other materials. It also functions as an excellent EMC shield for the amplifier. Each year about 94% of the aluminium used in our enclosures is recycled, with the three major sources being beverage cans, old automobile parts and scrap from the production of new aluminium parts and components.
MDF is a traditional enclosure material and also very good for making loudspeakers. MDF is an engineered wood product formed by breaking down hardwood or softwood residuals into wood fibres, combining it with wax and a resin binder, and forming panels by applying high temperature and pressure. The environmental impact of MDF has greatly improved over the years, and today many MDF boards are made from a variety of materials: however, Genelec currently uses MDF made from wood.
Fibration free and neutral sound. The best.
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With a cabinet made of aluminium, opens alot of finishes. Just think wrapped in mink. 