Let's start with the wiring diagram I chose, since this is rather important in the review: Two volume pots (one was a push/pull that integrated the bypass switch), stacked pot with mid cut/boost and the mid sweep (option #8 on the last page of the wiring diagram PDF on aguilaramp.com, IMPORTANT: THE LAST PAGE OF THE PDF IS NOT INCLUDED WITH THE PREAMP WHEN SHIPPED), and stacked bass/treble cut/boost.

The bass in this thing is big. Really friggin' big. As in, fill the room with thick, buttery thunder that'll probably make you fill your pants big. It affects the sound with 18db of boost or cut at 40Hz. Powerful. The mids are very nice, and I quite enjoy the mid sweep that allows me a little more versatility than switching between 400Hz and 800Hz, and ONLY those. Boost low-mids for Julian Crampton's tone on Jacob's Ladder (big frickin' midrange), or cut the high mids for a fat slap. The SPB-2 pickup I'm using is very thick and midrangey already, so I don't have to boost the mids too much for most applications. The treble is very fun to toy with -- boost it and the high mids and cut the bass and you get a very guitar-esque "twang".

One of the big things I really like about this preamp and that really bears metioning is that when the eq is flat, it still sounds like my bass. There is no colouration of the sound, which is fantastic, because even though there's a bypass, there are times when I will want the volume of the preamp and the tone of my pickups, and this preamp lets me have my cake and eat it too.

Also something that bears mentioning is the ridiculously small size of the thing -- check it out on Aguilar's site to see it compared to a standard size pick.

Now, installing this is a bit less than fun. There are a ton of wires to do, and I chose a rather complicated setup, and it still took a guy who's done thins kind of thing several times 4 days to install this bugger! Note that one of those days was spend routing wood for the two batteries. You can, however, get this prewired from bestbassgear.com for a little more.

Things supplied by Aguilar when you buy the stacked knob: 1 volume pot, 1 stacked pot (50k linear), the preamp, wiring diagram (all combinations except the mid-switch options).

Construction	98%
(Spotless, but the sticker they have on it is rather cheap)
Clarity	100%
(Brilliant -- with the EQ flat, it sounds like my bass, only louder.)
Versatility	100%
(Perfect for everything I need, and half the stuff I don't!)
Value	100%
(I love this thing, I love it to death!)
Overall	100%
(For the money, this thing is pure gold -- pure. Gold.)