Loudspeaker Designs and Articles for the DIY Enthusiast
A smaller monitor sized
Statement design using top
In contrast to the Finalists Monitors, the MicroStatement crossover is fairly complex. Due to the frequency limitations of the ribbon, I needed to push the
NE149 out to at least 3.5 kHz. While this was reasonably straight forward, it took the addition of a couple of notch filters in addition to the 2nd order
electrical LP filter to provide the proper transfer function, phase and impedance properties. The tweeter is a more traditional 3rd order electrical filter with a
couple of attenuation resistors thrown in for good measure. The crossover is at 3.5K although due to the steeper cross of the tweeter it appears to be 3.2K.
Regardless of what we define the crossover point to be, the performance of the ribbon was not impacted.
Woofer network tips
L1031 is a steel laminate inductor. L1011 is at least a 16 gauge air core. 15 gauge or 14 gauge air cores are acceptable substitutes. L1061 can be a 20
gauge or 18 gauge as the effects of its DCR are swamped by R1061. Use good polypropylene caps and 10 watt resistors. Wirewounds are acceptable.
Ribbon network tips
L2031 can be an 18 gauge or 20 gauge. There are no special requirements for the caps other than use good polypropylene.