Design 2-way (Mar 30, 2013)
High Frequency   Selenium D220Ti OMF 1" Titanium Compression Driver  
Horn   Pyle PH715 Asymmetric horn
Low Frequency Dayton RS180s  7" Shielded Mid-Woofer
Crossover Synergy (Bi-Amp) at 1,750Hz (18dB/oct)


The Nightingale-III is equipped with a Pyle PH715 Asymmetric Horn coupled to a Selenium D220Ti 1" Compression Driver.

Potential buyers should be aware that the mounting holes do not comform to standard 3" hole to hole spacing. New holes need to be drilled to mount a "bolt-on" driver. It is not difficult with a drill bench. The effort is worth it as this horn does have some interesting attributes.

Pyle PH715

I believe the PH715 is loosely based on Nexo's PS Series loudspeakers. The asymmetric is from the different coverage pattern above and below the vertical axis of the horn. The lower half of the horn has a wider dispersion (100 degrees) whereas the top is narrower (50 degrees). Due to this asymmetry, the lower half is used for nearfield and the top half, being narrower, for long throw.

On axis response is quite impressive. Pretty smooth with a constant roll-off. In auditioning this horn, the horizontal off-axis response sounds superior to the Dayton HE07E.

The Black trace in Fig 1 is of the PH715/D220Ti combo with the Synergy crossover set at 1kHz (18dB/oct). It appears it's possible to cross at 1,200Hz - 1,500Hz.

The Red trace is with the crossover at 1,750Hz. I opted for this frequency because the D220Ti is very comfortable with it. No strain at all.

The Violet trace is with the addition of an 8.2uF capacitor. This capacitor has dual purposes.

Firstly, it corrects the attenuation. The response is virtually "flat" up to 10kHz.

It also offers some protection to the compression driver. Whatever small DC offset that may appear at the output of the power amplifier will be blocked by this capacitor.

Fig 1 - PH715 with D220Ti OMF

Putting it all together

How does this PH715/D220Ti combo matches up with the Dayton HE07E/Pyle PDS382 ?

Overall, it sounds better, especially off-axis. It's not really a fair comparision as the Pyle PDS382 is less than half the cost of the Selenium D220Ti. Nonetheless, the Pyle is outstanding if one is on a budget.

Fig 2 below shows the amazing response "flatness". What is equally amazing is all it took was a 8.2uF capacitor. No other passive components were needed.

Fig 3 is the response without the superimposed LF/HF traces. This is indeed a very impressive response, considering the simplicity. It's important to note that the compression driver is connected in Reversed Phase.

Fig 2 - RS180s with D220Ti/PH715

Fig 3 - Nightingale-III Frequency Response
Compression Drive in Reverse Phase


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