MUNDORF AMTU60W1.1 — AMT-Tweeter
93 dB Sensitivity (2.83 V/1 m) · 4 Ω
Technical data
- Impedance: 4 Ω
- Sensitivity: 93 dB (2.83 V/1 m)
- Application: ab 2200 Hz (12 dB/Okt.) bis 34 kHz
- Dimensions: L55xH75xZ45 mm
- Magnet: Neodymium
Datasheet (PDF) · Manufacturer page
Series: AMT U · Part no.: 42A-CHS-AT-MUN-0003
Mundorf AMTU60W1.1: AMT tweeter without faceplate, 93 dB, usable from 2,200 Hz
If you want to integrate an air motion transformer into your own baffle, behind a routed recess or into a waveguide of your own design, you need the bare element without a pre-mounted plate. That is exactly what the Mundorf AMTU60W1.1 is: an AMT tweeter from the AMT U series in a housing 55 mm wide, 75 mm high and 45 mm deep. Mounting is up to you, but in return you are completely free in how the front looks and how flush the foil sits.
Technically the AMTU60W1.1 brings a neodymium motor, 4 Ω impedance and a sensitivity of 93 dB at 2.83 V in 1 m. The transmission range runs from 2,200 Hz to 34,000 Hz. Compared with smaller AMT elements, the longer foil means more diaphragm area and therefore more headroom and a lower possible crossover point. The price is a narrower vertical dispersion, which in a living room with a fixed listening position helps more than it hurts, because less energy reaches ceiling and floor.
Use and enclosure
The crossover floor is 2,200 Hz with 12 dB per octave. In a typical 2-way speaker with a mid-woofer of medium size I would place the crossover noticeably above that or work with 18 to 24 dB per octave; that keeps the AMT's distortion low through the transition and the mid-woofer does not have to stay clean all the way up into the critical range. In 3-way systems with a dedicated midrange the AMTU60W1.1 is an uncomplicated partner, because the midrange can handle the hand-over comfortably.
When mounting without a faceplate, it pays to set the foil flush with the baffle and to chamfer or round the edges of the cut-out, otherwise edge reflections show up in the frequency response. The 4 Ω have to be part of the crossover maths: a filter calculated for a higher impedance ends up at the wrong frequency on this tweeter.
What to look out for
- No faceplate: you need your own bracket or recess, but the front design is entirely yours.
- Dimensions 55 x 75 x 45 mm: compact enough for narrow baffles.
- 93 dB at 4 Ω: level matching to the mid-woofer usually needs a voltage divider.
- Floor at 2,200 Hz with 12 dB per octave: cross higher or filter steeper.
Frequently asked questions
How do I mount the AMTU60W1.1 without a faceplate?
The element has no pre-mounted plate, so you need your own solution: a recess in the baffle in which the housing sits flush, or a self-made adapter plate. The 55 x 75 x 45 mm dimensions are the starting point for the cut-out; the exact drawings are in the PDF datasheet that 42.audio provides with the product.
What amplifier do I need for the AMTU60W1.1?
Because of the 4 Ω and the high 93 dB sensitivity, almost any amplifier that is stable into 4 Ω will do. The crossover matters more: it has to unload the tweeter reliably below 2,200 Hz and bring the level in line with the mid-woofer.
Is it worth stepping up to the larger model in the series?
If you want to cross lower or need more output, yes. The AMTU60W1.1 is the better choice when the baffle is narrow, the crossover sits above 2,200 Hz anyway and you prefer a slightly wider vertical dispersion.
Mundorf AMTU60W1.1: 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 AMTU60W1.1 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 AMTU60W1.1 with datasheet PDF, all key data in the driver database. More drivers from this manufacturer: Atlas Mundorf.
Specifications
| Manufacturer | MUNDORF |
| Category | AMT Tweeter |
| Series | AMT U |
| Magnet | Neodymium |
| Impedance (Ω) | 4 |
| Sensitivity (dB) | 93 |
| Frequency from (Hz) | 2200 |
| Frequency to (Hz) | 34000 |