No. 404 enclosures with Sigma drivers.
It sounds similar to a Lambda, but different, and very different from a stock Sigma.
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Team STAX
Primary cans: STAX SR-Sigma/404 Hybrid. (Effectively an SR-Lambda.) Portable Phones: Etymotic ER-4S.
Amp: STAX SRA-35. DAC: Total Bithead 2006. Portable Amp: Total Bithead 2006.
Portable Source: Rockboxed 30GB 5G iPod. Speakers: M-Audio BX8a, Ohm Acoustics Walsh 2.
"Perhaps Head-Fi could have a similar contest, such as "Hold a Hornet for a Hornet" Whomever holds it longest wins." - Vicomte