The Rumour is a stereo in, stereo out, 24-bit, 44.1 or 48khz digital multi-effects unit.
Analog connectivity is via 1/4" TRS. XLRs would have been a nice touch, but no biggie there. Analog output operating level is switchable between -10dBv and +4dBu at the back of the unit. RCA-type S/PDIF digital i/o is also available, as well as MIDI i/o and a jack for a pedal which I have never used.
The Rumour has a good variety of large and small room, hall and plate type reverbs separated into banks, as well a additional banks of gated/reverse/compressed verbs, "unusual" effects (examples: "acid trip room," "cabinet in room"), a Kurzweil party piece bank called "LazerVerb" which I find rather gimmicky and not often very useful, and banks of delays and delay/reverbs, choruses, and flagers. There are 192 presets in all. In addition, you can save your own edits in four banks of 16 each, which is a nice touch for recall or personal go-to presets, particularly as the unit will NOT save your edits when the power is switched off at the end of a session. You either save it or lose it.
The unit also has a 3-band digital EQ on the output which can be bypassed by a master bypass switch which will also allow you to bypass the effects, or both EQ and effects.
The presets are generally ok starting points which I always like to go in and edit/tweak. This is quick and easy to do thanks to a straightforward and simple parameter selection interface based mainly around a pleasant-feeling stepped rotary knob and a jogwheel.
It's a fairly intuitive unit to navigate, menus are straightforward and the display is easy to read. The settings can be edited fairly deeply, though if you prefer a simpler menu and don't want to go really deep with the editing, you can set the unit into a mode that shows fewer editing options. This is a nice touch to help the Rumour suit the tastes of a broader variety of users.
I will nitpick that the 3-segment LED input metering is completely insufficient. There is a yawning chasm of decibels between -48, -12, and "CLIP" which makes gain staging through the unit tricky. Fortunately, the output trim is a different story as its position in 0.5db increments is visible on the display.
Kurzweil includes a perfectly satisfactory, simple manual although users already familiar with other hardware rack effects should be fairly comfortable navigating the unit right away.
It's nice to have the other effects, but I mainly reach for the reverbs on this unit. The medium and longer/bigger rooms, halls and especially plates are very good. Extremely short reverbs can take on a bit of a metallic sound; the unit doesn't excel there though the bright, metallic character can be finessed a bit, but otherwise I would describe the sonic character of the Rumour as having a pleasant lush sparkle. The delays are also useful and tapping in a tempo is a piece of cake via a pushbutton that functions with an audible click.
The digital 3-band EQ works well enough but I prefer to EQ my reverbs on analog console channel returns, so it's not a feature I use very often.
The digital converter quality is quite decent and you can indeed leave the EQ and effects bypassed and use this unit as a stereo digital audio converter, which is a nice little trick. It's not ultimately neutral and refined as with high end audiophile quality converters, but certainly better than you'd expect in a mid-priced effects unit.
The Rumour excels at my most-used reverbs, has a number of addition effects for icing on the cake, and has a pleasantly colored, generally high quality sound sound that is unique compared to other brands I use such as Lexicon, Yamaha, TC Electronic. My few complaints about it are mainly aesthetic, though I would prefer it to be be a bit smoother with short reverbs.
The unit is well built and has never given my any trouble in some 7 years of routine use. The chassis is vented, it does give off a bit of head and it's a good idea to give it a bit of breathing room in the rack.
Kurzweil has discontinued the Rumour (and its class-mate, the Mangler), but still makes basic info and the manual available on its website. I considered it to be a very good value at its new price, and even moreso on the used market which will sadly now be the only option for purchase.