The UM 20 is a bookshelf speaker that can be also put on a stand. It is a high specification loudspeaker achieving striking musical performance in a very compact size. 

Advance Acoustic had decided to design the loudspeakers using three basic categories :
- Cabinetwork
- Speakers
- Filter circuit

Cabinetwork :
All Advance Acoustic speakers cabinetwork is made in MDF due to its rigidity and manufacturing precision ; Moreover, partitions and strengthening pieces prevent any vibration or interference. The internal volume of the speaker is calculated in minute detail as are the dimensions of the tuning port for every speaker used.

Speakers :
Advance Acoustic speakers are designed according to specifications in a rigorous manner in order to provide the best results. Woofers are provided with a treated paper membrane in order to get a more neutral sound and pure copper moving coils are wired on capton. To prevent any harshness and enhance smoothness, tweeters have either plastic or impregnated fabric membranes. Moving coils are cooled in ferrofluid.


Crossover circuit :
Despite the care brought to cabinetwork and the choice of the best speakers, the final result is determined by the crossover. Advance Acoustic has devised an accurate rigorous filtering technique respecting the acoustic and electric phases. A choice of the best components, air selfs, polypropylene condensers, high standard ceramic resistors, non-radiant positioning of the components and judicious cuts frequency.

Specifications
For amplifier: 20 to 80 W
Frequency response: 55 Hz to 20 kHz ( +/- 3dB )
Crossover : 3 kHz
12 dB / octave
Efficiency: 88 dB
Impedance: 4 Ohms
2 way
2 speakers
Boomer: 13 cm
Tweeter: 2,5 cm
Finish: Wild cherry real wood venner & glossed black lacquer

List price £249

Sound Hi Fi are one of several UK dealers of advance acoustic

PO Box 2001 Dartmouth Devon TQ6 9QN Great Britain

Telephone 01803 833366 Fax 01803 839498 e-mail sales@SoundHiFi.com