MUNDORF AMTU110W1.1

Mundorf AMTU110W1.1: U-series AMT tweeter with 6 Ω, 93 dB, usable from 1,800 Hz

The Mundorf AMTU110W1.1 belongs to the AMT U series, Mundorf's range of air-motion transformers for DIY builders and small manufacturers. The key figures: 6 Ω impedance, 93 dB sensitivity at 2.83 V and 1 m, working range from 1,800 Hz with a 12 dB/oct. high-pass up to 27 kHz, neodymium magnet. Its 55 x 125 x 45 mm dimensions make it a slim tweeter that fits narrow baffles.

As an AMT it uses a pleated foil whose conductor tracks sit in the magnetic field. The folds pull together and open up, and the air is pushed out at increased velocity. The neodymium motor keeps weight low and the drive compact; ferrite would need far more volume for the same field strength. This version comes without a faceplate and is meant for mounting behind a custom bezel or in a baffle recess. If you prefer a ready-made faceplate, the AMTU110W1.1-R variant is the one to pick.

Use and enclosure

The AMTU110W1.1 is a tweeter for two-way loudspeakers with mid-woofers that play cleanly up to 1,800 Hz and beyond, and for three-way systems above a midrange. The manufacturer's figure of 1,800 Hz with 12 dB/oct. is a minimum requirement for the crossover: at that frequency the slope must not be shallower. A steeper 24 dB/oct. high-pass relieves the foil further and lets the crossover sit closer to the limit without distortion rising.

At 6 Ω, 2.83 V corresponds to slightly more than 1 W, so the 93 dB sensitivity almost equals the classic 1 W figure. Calculate the passive network consistently with 6 Ω, otherwise crossover frequency and Q will shift. Mount the AMT upright, because the 125 mm tall diaphragm narrows vertical dispersion and radiates wide horizontally. At 42.audio you will find the datasheet PDF, the driver database with the other U-series models and the enclosure calculator for the matching mid-woofer.

What to look out for

• 6 Ω impedance: calculate the crossover with 6 Ω, amplifier should be 4 Ω stable.
• 93 dB at 2.83 V/1 m: matches typical hi-fi mid-woofers.
• Usable from 1,800 Hz with at least 12 dB/oct., steeper is better.
• 55 x 125 x 45 mm, no faceplate: plan your own bezel or a recess.
• Neodymium magnet: compact and light.

Frequently asked questions

Mundorf AMTU110W1.1: manufacturer, spellings and classification

Mundorf is Mundorf EB GmbH of Cologne, Germany, known for crossover components and the air motion transformer tweeters of the AMTU series. The AMTU110W1.1 is an air motion transformer (AMT) tweeter from the AMT U series, available from 42.audio, Mundorf dealer in Germany, with datasheet and full specifications in the driver database.

At 42.audio you get the MUNDORF AMTU110W1.1 with datasheet PDF, all key data in the driver database. More drivers from this manufacturer: Atlas Mundorf.