# Pyle PH565 horn + PRV D280Ti

 Having tested out two compression drivers with this PH565 horn, I’m still not too happy with the results. In this third attempt, I decided on the PRV D280Ti. Fig 1 shows the behavior of the D280Ti when loaded with the PH565 BLACK trace = RAW (no crossover, no CDEQ) RED trace = electronic crossover at 1.5kHz (24dB/oct) BROWN trace = electronic crossover at 2kHz (24dB/oct) BLUE trace = electronic crossover at 2.5kHz (24dB/oct) (Fig 1) Frequency Response of PRV D280Ti with Pyle PH565. Vertical Scale = 5 dB/DIV Fig 2 shows the Dayton RS180S with the D280Ti/PH565 crossed at 2.5kHz (24dB/oct). CDEQ was not activated. This combination looks promising. (Fig 2) Response of Dayton RS180S with PRV D280Ti/PH565 Improper Summing The Red trace in Fig 3 shows what the response will look like when the drivers are not time aligned. Due to the large acoustic offset, it resulted in a notch at about 2.2kHz. (Fig 3) Summed Response D280Ti in Reverse Phase Fig 4 shows the summed response (Red trace) when the Compression driver, D280Ti, is wired in reverse phase. Now, the notch shifted to about 1.8kHz. (Fig 4) Summed response with D280Ti in Reverse Phase Applying Delay Fig 5 shows the effects of delay added to the RS180S (Red trace). With the correct amount, a deep notch is observed at the crossover frequency. (Fig 5) Delay Added to RS180S Proper Summing with Time Alignment Fig 6 shows the correct summed response (Red trace) when the D280Ti is re-wired back to normal phase. Of the three compression drivers tested, this PRV D280Ti has the smoothest response. (Fig 6) Time Aligned Summed Response