SMALL FI 4 BASS CUT LO FIDELITY EFFECT PEDAL PASSIVE EQ HIGH PASS FILTER LOW | eBay The Small Fi was mentioned in other HPF discussions and nobody seemed to know much about it. I went to eBay to check it out, where it was only $25 USD + $6 shipping, so I figured at that price I could afford an experiment. Someone else asked me to review it here, so here we go. 1. IT'S NOT A PEDAL. It's more a like a junction box in your signal chain. There is no footswitch, just a true bypass on-off toggle switch. Which is probably fine since most users of HPFs will set it once for their current space and forget it. 2. SIZE: Putting it next to my MXR Script Phase 90 for a quick visual, the Small Fi is roughly 2/3 the size of a standard MXR pedal. Breaking out the tape measure, the case is 3 inches by 2 inches, and the height is 1.5 inches from the top of the knob to the bottom of the case. 2. CONSTRUCTION: The wiring is hand wired, but frankly, the exterior is what you'd expect for the price. The case is two pieces of snapped together plastic. The graphics appear to be a sticker, not painted. Weight is light enough to make one wonder if there's actually anything inside. But the controls and jacks feel solid despite all that, and to be fair, it's not a stompbox and most people won't be constantly fiddling with it, so it probably doesn't NEED to be built like a bunker. Would be nicer if it was, though. ASIDE: The builder mentions the possibility of a stompbox version; I think that putting this in a metal stompbox would probably be a good idea. Especially if it can be arranged to fit a standard 1590A mini pedal format. 3. CONTROLS: Input and output jacks, one on-off switch, one unlabeled knob which I assume controls the setpoint. No extras, just pure function. It would be nice if the knob had frequencies labeled so we know just how much we're cutting. 4. POWER: None. It's passive. Just put it in your signal chain and go. 5. FUNCTION: Using my passive Squier Jag SS > Small Fi > Acoustic B100C amp, I notice no difference with the Small Fi OFF; it is true bypass. But when I turn the Small Fi ON, there is an immediate positive difference even with the knob turned all the way down, so the bottom of the knob's range is not zero. There is also a noticeable volume drop with the Small Fi ON, which gets slightly worse as one turns up the knob and is to be expected from a passive device; this is probably why the Broughton HPF/LPF includes its own gain knob for makeup. In any case, you will need to make up the volume drop elsewhere in your chain. As I turn the Small Fi's knob up, the filter setpoint rises; it's not a WIDE range across the full turn of the knob, but still useful. I noticed no additional noise even turned fully up. I tried it in different rooms to get a feel for adjusting it to different spaces, and it definitely tames the hollow, boomy echoes in my old house, anyway. 6. CONCLUSION: The plastic box doesn't inspire roadie confidence and the volume drop is annoying, but otherwise, the Small Fi a brutally simple, inexpensive HPF that performs as advertised. If you want a HPF on a budget, I'd recommend it.