Bought and after 20 mins of testing I decided it was going back.

In short, when engaged it does nothing meaning I don't hear a difference. Only heard a difference when turning the eq knobs.

YT video by "bass the world " said it best and was right. In conclusion, they should rename this a DI box and remove the word "preamp" from the unit. I'm returning it.

Very user friendly straight out of the box.
Used on a gig the next day and it performed
Like a champ. Great for active or passive bass
I highly recommend it.

For a long time I have used Augilar Tone Hammer Preamp/DI box. I have always loved it. Recently it stopped working on the DI part. I looked to replace it and found the new AG Preamp. It gives me the same functionality without the extra size and weight. Well worth the investment..

Well, looks and sounds like Aguilar has stepped up their pedal game! IMO, this AG Preamp pedal has VERY useful features (yes, I prefer it over the Tone Hammer pedal). EQ is voiced very well! The Bright/Deep switch, YES! YES! Thank you!

Once again Aguilar has exceeded expectations. This DI box has so many features and alternative setups. Adjustments are smooth and precise. Congratulations to Aguilar on a superior product.

Really enhances the sound of a passive bass.

It does exactly what its designed to do

This thing may be small in size but it is BIG on tone. Going ampless at church requires a good sounding preamp and this one fits the bill.

PROS: Nice construction. I think it looks pretty cool. Handy little size. Nice 4-band EQ, although it's nothing special. The bright/deep/both switch is a little clunky to select, but it's functional and useful. Has aux/in + headphone jack, which is handy and unusual, especially among Aguilar products. The tone is similar to the AG700, of course, which can be a good thing if you like it. It's pretty clean/transparent without any noticeable added noise. I think it sounds good, but any tonal nuance won't translate to a mix, live or recorded. It will just sound like a bass, and it will be indistinguishable from other similar DIs. CONS: 18V power supply not included, and it doesn't take batteries or use phantom power. The Tonehammer pedal does offer all three ways to power it. No unaffected output thru-channel, which is not cool. It's cool that it's small/light, it's not a suitable standalone - it *really* needs to be mounted on a board. A very small tug from a bass cord, and it will flop around like a matchbox. This diminishes the value of it as a headphone amp. E.g., a Helix Stomp holds up well as a standalone desktop unit. The AG preamp does not, and who wants to put their whole pedal board on their desk? Overall, I feel like the Tonehammer offers a lot more for the same price; although the tone is a little different, and I think the AG preamp introduces less noise. For $ the AG preamp is by no means a bad buy, but there are so many other choices that seemingly offer more.

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Just got the AG Preamp. I use the AG700 so I wanted something to sound like my normal amp when I am going direct. The preamp sounds great. Very clear and not overly aggressive or harsh. Easy to dial in. The deep and bright will be useful! Great size for a pedal board. I have it coming after my HX Stomp to give me a quick way to teak my sound. Only thing I'm not a fan of is that the deep and bright are always "auto on" when the pedal is powered on. Not a huge deal since you just have to press a button, but I like my pedals to remain how I left them when I power off. This is probably just me though.