HiVi M8a Passive Crossover

The plots below (Fig 8) are the In-Room responses of the M8a, taken on-axis with the cone. The Violet trace is with the Synergy crossover at 1,500Hz. The Blue trace is with a 3rd Order Passive Network.

Fig 8 - M8a In-Room Frequency Response at 1,500Hz (18dB/oct)
1 meter - On-axis with M8a

Selenium D220Ti omf Passive Crossover

The Blue trace below (Fig 9) is the frequency response of the D220Ti with a Passive Network. The Violet trace is with the Synergy crossover at 1,500Hz.

Fig 9 - Selenium D220Ti with Pyle PH715


Nightingale - IV Response with Full Passive Network

The Blue traces in Fig 10 show the M8a and the D220Ti crossed at 1,500Hz. The Red trace above is the Summed Response with the D220Ti connected in Reversed Phase. The Orange trace is when the D220Ti is In Phase. It is important to connect the compression driver in Reverse Phase otherwise there will be a deep notch at 1,500Hz. The Red and Orange traces are displaced for legibility.

Fig 10 - Nightingale-IV Response using Passive Crossover


Fig 11- Nightingale-IV Passive Crossover (1,500Hz/18dB/oct)


Component Recommendations

All Capacitors are Polypropylene.

All Inductors are Air-Core. Minimum 18 Awg.

All Resistors are rated 10 Watts minimum.


Fig 12- Nightingale-IV with Passive Crossover


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