Monitor Silver 12" Dual Concentric
- Cabinet Designs and Predicted Low Frequency Response -

Using the Thiele and Small parameters for the Monitor Silver 12" unit, the predicted low-frequency response can be calculated. Presented here are the results for two different cabinet designs:

Cabinet 1: Maximally Flat Response

In this case the internal volume is 2.1 cubic feet, and it is a reflex enclosure with the vent tuned to 58 Hz. A vent with an opening of 6" x 4", and with a duct of 3.2" connected to it should give the correct tuning. This can be checked by verifying an impedance minimum at the tuning frequency (58 Hz). While this cabinet gives the flatest response, the bass extension is not all that satisfactory.

Cabinet 2: Large Box

In this case the internal volume is 6.2 cubic feet, and it is a reflex enclosure with the vent tuned to 43 Hz. A vent with an opening of 10" x 4", and with a duct of 2.3" connected to it should give the correct tuning. This can be checked by verifying an impedance minimum at the tuning frequency (43 Hz). The bass extension is good down to 40 Hz, but at the cost of some variation in response between 50 and 200 Hz.

Later model drive units with lower free-air cone resonance will more readily give bass extension.

 

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