Before you knew it, every band and solo singer/guitarist in a two state area wanted one and I was inundated with orders. At the time I was gigging almost every night, and these boxes were pretty labor intensive (mostly because of hand drilling the metal boxes), so after making about 20 units or so, I decided that I didn't want to be in the manufacturing business and killed what could have been a promising side business.
I bring this up because Radial Engineering built essentially that same box, but used the excellent Dean Jensen JT-DB-EPC transformer to make one of the best passive (it doesn't need power) DI's on the market today.
I can tell you from experience from using them and making my own that all DI's are not made equally. The passive boxes that are built around a transformer really depend on that transformer for the sound. Buy an inexpensive DI like a Behringer and it will work fine, but won't have the big bottom end that you need for a great bass guitar sound. Buy a Radial JDI or one from another brand that's built around that great Dean Jensen transformer, and you'll really hear what a bass should sound like.
If you can handle some tech talk, Radial's Peter Janus provides a great overview of the JDI and direct boxes in general.
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