Having had Philips MFB 544 active speakers before (model number 22RH544), I had been longing for a subwoofer to match the pair of passive speakers I later replaced them with.
The MFB implementation Philips got done in the 70s was really impressive, playing flat down to (in my simple Android smartphone Spectroid measurements) 27 Hz in a tiny box of 29 x 39 x 22 cm with 8 inch drivers. Due to the old, inefficient design, they consumed
10W each in standby and ~50W while in use, and since they used the old DIN connectors that were likely corroded, they would sometimes drop in volume and need replugging.
I fell in love with the sound signature Philips had back then in this product line, so I went for a pair of 22RH457, which are twice as big but passive, with a passive radiator design, that has them output flat down to 50 Hz.
The Rythmik design of servo-controlled subwoofers was just what I was looking for, to get the strong, controlled bass presence I remembered from the MFB speakers, but without the power draw and with more modern connectivity.
The way they present their products also gained my sympathy. While I'm not very knowledgeable when it comes to audio physics, I'm very technically and scientifically aligned and appreciate it when companies provide clear data and measurements up-front before purchase. While there are similar products made in Europe, they are priced much higher (Grimm Audio / ServoLabs Little/One and Grown/Up speakers) and don't provide much technical information or measurements.
Living in the EU, I contacted Rythmik directly by email and stated clearly that I'd be okay with shipping costs of up to 400 USD. I went for the lightest model L12, since even its measurements seem easily sufficient for the two fairly small (16 and 25 m² respectively) rooms that I intend to use them in.
They responded quickly to all my questions and confirmed that shipping of the L12 model to Europe is possible. I was quoted 229 USD in shipping costs to my address in Vienna, Austria, for a total of 858 USD. UPS also charged import taxes of 96€, which was less than I expected, for total costs of about 900€. They were packed very safely, double box with foam layers on all corners, and arrived in perfect condition (despite the UPS delivery guy dropping them from about 20 cm height).
They draw about 7W in standby and 15-20W at moderate listening levels, with what I consider powerful output. I've only used them for music so far. I bought them at the same time as a second-hand SVS SB 2000 subwoofer, also 12 inch, for 450€ (new price 680-900€), and I'll compare their output in the next weeks. On first impression, the Rythmik L12 extends substantially further down, and the wide selection of adjustment knobs and switches is certainly appreciated.