Plenty of power, limited space: While compact power amplifiers almost always rely on efficient Class-D technology to show off their muscle, IOTAVX has taken a more unconventional approach with the new B:ound. Its analog Class-B output stage is housed in a chassis just 16.4 centimeters wide and 7.5 centimeters high. Including connectors and feet, the stereo power amplifier measures 23.8 centimeters deep and weighs 2.4 kilograms.
This makes the IOTAVX B:ound ideal not only for a space-saving stereo system. It can also handle the front channels of an AV receiver, provided the receiver has the appropriate pre-outs. This new product is available for pre-order from October 1 through 18, 2026, at an introductory price of 549 euros. Shipments are scheduled to begin on November 2.
Why Class B is unusual at this size
Unlike a Class D power amplifier, the B:ound does not amplify the music signal using high-frequency pulse modulation. In a classic Class B push-pull circuit, two transistor branches share the positive and negative half-waves of the signal. This allows for higher efficiency than Class A, but presents developers with the challenge of keeping crossover distortion as low as possible at the zero-crossing point. Most conventional hi-fi amplifiers therefore operate in the related Class AB mode with a higher quiescent current.
IOTAVX explicitly advertises a “true” Class B circuit. The manufacturer has not yet revealed exactly how its operating point was implemented. A compact switching power supply, used in place of a large conventional power transformer, reduces the space required. In this context, “Class B” refers to the output stage; the power supply itself uses switching technology.
2 × 200 watts is one word
IOTAVX promises 200 watts per channel at 4 ohms and 100 watts per channel at 8 ohms. IOTAVX lists the maximum power consumption as 505 watts, which supports these power specifications. The frequency response is said to range from 10 hertz to 40 kilohertz within a tolerance window of plus or minus 1 decibel, with a weighted signal-to-noise ratio of 96 decibels. In addition, the manufacturer touts a slew rate of 40 volts per microsecond and a bandwidth of 700 kilohertz. With a THD+N value of no more than 0.0002 percent at 100 watts and 1 kilohertz, distortion shouldn’t be an issue either.
RCA, Trigger, and Automatic Signal Detection
When it comes to connections, the B:ound keeps things deliberately simple. The signal from a preamp, a streamer with an adjustable output, or an AV receiver is fed into the power amplifier via a pair of RCA jacks. There are no balanced XLR inputs. Sturdy screw terminals are provided for the passive speakers.
A toggle switch on the back panel sets the operating mode. In the “Auto” position, the power amplifier detects an incoming music signal and turns itself on automatically. If the signal is absent for 20 minutes, it returns to standby mode. Alternatively, the B:ound uses its trigger input to follow the power on/off status of another component. Without a trigger cable connected, it can also be operated manually using the button on the front panel.
Standby power consumption is said to be less than 0.5 watts. A microcontroller monitors operation; if the temperature gets too high, the flashing power indicator first issues a warning before the power amplifier shuts down for protection. According to the manufacturer, the protection circuit also responds to short circuits and overloads.
Introductory Price and Availability
The IOTAVX B:ound normally costs 699 euros. Anyone who pre-orders it directly from the IOTAVX online store between October 1 and 18, 2026, pays 549 euros, saving 150 euros—or about 21 percent. This promotion is limited to 100 units; orders will be processed on a first-come, first-served basis.
Deliveries are scheduled to begin on November 2, 2026. Anyone who misses out on the introductory price can order the power amplifier later at the regular price.
Manufacturer and Pre-order: IOTAVX B:ound
