Pyle PH565 horn + Selenium D220Ti

The Pyle PH565 horn measures 7-5/8″W x 6-1/8″H, making it an ideal candidate for 8″ woofer. It has a coverage of 90°H x 40°V, a cut-off frequency of 1kHz, 1-3/8″-18 screw mount and made of ABS resin.

I’m not sure whether Pyle discontinued this horn but there’s one made by Goldwood, model GT-300PB. I believe they are exactly the same.

Pyle PH565 horn + Selenium D220Ti
Selenium D220Ti with Pyle PH565

Fig 1 shows the response of the Selenium D220Ti with the Pyle PH565 horn.

BLACK trace = RAW (no crossover)
RED trace = electronic crossover at 1.5kHz (24dB/oct)
BLUE trace = electronic crossover at 2kHz (24dB/oct)

No CDEQ activated. Microphone at 1 meter, tweeter axis. Gating at 5 msec. No smoothing applied.

From the plots, we can see some jagged response from 4kHz to 7Khz. Fortunately, these frequencies are not too critical as they are out of the vocal range.

ph565_d220ti_raw_1k5_2k_crop
(Fig 1) Frequency Response of Selenium D220Ti with Pyle PH565
Improper Summing

The Red trace in Fig 2 is the summed response of a Dayton RS180S with the Selenium D220Ti/PH565.

Some cancellation is observed on the right of the crossover frequency.

full_rs180s_d220ti_ph565_1k5_flush_crop
(Fig 2) Vertical Scale = 5dB/DIV
D220Ti in Reverse Phase

In Fig 3, the Selenium D220Ti is wired in reverse phase.

The summed response shows quite a displacement between the acoustic centers of the  D220Ti and the RS180S.

full_rs180s_d220ti_ph565_1k5_flush_rev_crop
(Fig 3) Selenium D220Ti in Reverse Phase
Applying Delay

In Fig 4, delay is applied to the RS180S. With the right amount, a deep notch is observed, which will be centered at the crossover frequency.

full_rs180s_d220ti_ph565_1k5_flush_rev_ta_crop
(Fig 4) Delay added to Dayton RS180S
Time Aligned RS180S and D220Ti/PH565

Fig 5 is the time aligned summed response when the D220Ti is wired back to normal phase.

Note the cancellation in Fig 2 has completely disappeared.

full_rs180s_d220ti_ph565_1k5_flush_ta_crop
(Fig 5) Time Aligned RS180S and D220Ti?ph565