As promised here is the review. I am a huge fan of the Summit TD-100 especially when it is modded to interface with the Bergantino IP series. I tested the Summit FeQ-50 at Jive Sound. I used a Brubaker 5 and a Roscoe LG3005 though the TD-100 through the FeQ-50 though a Berg IP212. The signal path was all Monster cables. Speaking of monsters several pros blasted though this rig so testing was with different playing styles. The FeQ-50 has 4 outputs. Two are Solid State and two are Tube. There is TRS for the -10 and XLR for the +4 on each. For this test I came out of the TD-100 TRS-XLR (4ft.) into the input of the FeQ. then XLR-XLR (4ft.) +4 into the IP. Sound? Whoa! The FeQ. has a defeatable hi-pass filter. Important to the IP folks. It rolls off 6db at 30 hz. You can hear it. It tapers the low lows that cause IP users issues from room acoustics or if they boost too much bass on their bass. I didn't have a hollow wooden stage to test this on. The FeQ-50 is an amazing 4 band parametric eq. From their site, "Each of the four bands has six switch selectable frequencies and 14dB of fully sweepable cut or boost. The low and high bands can switch between peaking and shelving filters, the low mid and high mid can switch between narrow and wide bandwidths." Even when I dialed up some weird eq. that one would rarely use it still sounded musical. I couldn't get it to sound bad. The options of settings are uncountable so I have to say try it and season to taste. Like the TD-100 each note is clear and warm instead of your whole sound having a color. The TD and the FeQ. sound like one unit when plugged together. The pair can be mounted in Summit's own rack which replaces the tops of the units. As tested they look cool stacked. These units are so small that I carry my TD in a Grover Percussion bag. Similar bags are made by Meisel. They are tamborine bags. Imagine the padded cover of an AG cab or EA the size of a Tamborine. With your bass over your shoulder and an IP112 and this, it's a one trip trip. Please see their website as the details of the eq are apparent from the specs and the enlarged front panel shot. www.summitaudio.com/feq-50-equalizer.htm The IP212 sounds great. The TD-100 sounds great. I see the FeQ-50 giving the player that ultimate tone control when he hits that bad room. Some IP users have wanted tone controls. Here is a way for the bassist to have very specific shaping options while retaining his pure bass sound.