Infinity Alpha speakers

Content:

1. Introduction, why these old speakers?
2. Overview of the Infinity Alpha System
3. Infinity Alpha 50, main speakers
4. Infinity Alpha 20, rear speakers
5. Infinity Alpha Center, center speaker
6. The crossovers and update of components
7. How to replace bad tweeters
8. The new tweeters

Note:
I take no responsibility or liability for what are written here, you use the information at your own risk!

4: Infinity Alpha 20, rear speakers

The Alpha 20 rear speakers are of similar design as the Alpha 50 but only 2-way speakers, a 6" bass / mid range and a 1" tweeter.

Infinity Alpha 20 specifications:
Manufacturer: Harman
Year: 2002
Power rating: 20 watts
Nominal Impedance: 8 ohms
Bass reflex: vented box
Crossover: 2-way, bi-wiring
Crossover Frequencies: 3000 Hz
Sensitivity: 89 dB / 1W / 1m
Frequency response: 55 Hz - 22 kHz

Drivers,
Tweeter, part number A1201A-L, 9747201:
25mm ceramic dome, 4 ohm?

Woofers, part number A1206A-L, 9747213:
165 mm ceramic

Dimensions W x D x H: 220 x 290 x 385 mm
Weight: 9 kg each speaker

Crossover drawing: