Made with 18mm Baltic birch, cut on a CNC machine - this is for the WB4 with the Sounderlink DQ40TZF-02 wideband driver. This driver is a nominal 4” paper cone, with a 4 ohm rating, and has a whizzer cone and a copper colored aluminum phase plug. These are sold in pairs - price is for a pair.

It includes all the wood parts to build a pair cabinets, and a PDF assembly manual. (It does not include drivers, baffle step filter parts, or any other hardware. You will need to purchase the WB4 Mass Loaded Transmission Line Speaker Build Manual to complete the speakers.

Flat packs will be cut after ordering, and shipped via UPS. Shipping cost will be calculated for your zip code. Sales and shipping are available ONLY in the USA.

Surface options - if you are planning on having the Baltic birch be the finish surface, and you want it to be smooth as possible - you can opt for this. We will inspect each panel for any surface texture flaws that would not smooth after sanding. If you are going to veneer or paint etc, and can fill in occasional random surface defects, then you can opt for this.