Speaker Lab render
Penn Audio Install Line · Two-way point source
Penn IL6
Point source. Phase-aligned. Install-ready.
2 × 8″ + 1″ compression driver · equal-path wave former
| Bandwidth | 83 Hz – 20 kHz + |
|---|---|
| Max SPL | 115 dB peak (10 ms) / 109 dB continuous |
| Coverage | 90° H · V set by the 7 cm slot: 95° at 4 kHz, 43° at 8 kHz, 21° at 16 kHz |
| Tuning | 56.3 Hz |
| Impedance | 4 ohms |
Overview
What it is.
Two 8-inch neodymium mid-woofers frame a compression driver on an equal-path wave former: nine channels of identical length carry the driver's round exit to a flat 7 cm slot, so the wavefront arrives flat. The passive network is fitted, part by part, for phase alignment through its 2 kHz crossover, using the former's own path delay.
The IL6 plays from 80 Hz up on its DSP preset and hands off to the IL18 at 80 Hz: the two are a complete system.
Response
Modeled in the Speaker Lab.
On-axis response at 2.83 V / 1 m from the full system model — drivers, cabinet, crossover and waveguide together.
Specifications
Engineered, then verified.
| Frequency response (−5 dB, modeled, DSP preset) | 83 Hz – 20 kHz + |
|---|---|
| Maximum SPL (1 m, modeled, with 430 W amplifier) | 115 dB peak (10 ms) / 109 dB continuous |
| Nominal impedance | 4 ohms |
| Coverage (modeled) | 90° H · V set by the 7 cm slot: 95° at 4 kHz, 43° at 8 kHz, 21° at 16 kHz |
| Crossover | Passive, fitted 4th-order networks, 2.0 kHz |
| Transducers | 2 × 8″ neodymium mid-woofer · 1 × 1″-exit compression driver |
| Cabinet tuning | 56.3 Hz |
| Processing | DSP preset: LR4 80 Hz high-pass · baffle-step shelf |
| Enclosure | Vented trapezoid, front slot, Baltic birch |
| Dimensions (W × H × D) | 11.0 × 26.8 × 11.8 in (280 × 680 × 300 mm) |
| Weight (modeled) | 18 kg (40 lb) |
| Connections | 2 × NL4 (INPUT, LINK) |
| Finishes | Black or white as standard; any finish in the Penn Audio Custom library to order |
Inside the design
Why it’s built this way.
Equal-path wave former
Nine equal-area channels, each 4.6 cm long to within rounding, end square-on in a flat 7 cm × 7 mm slot; a 90° flare sets the horizontal coverage. 7 cm deep, so the driver sits close to the woofers' acoustic centers. Printed in two parts and fitted flush.
Phase-aligned crossover
Fourth-order networks, fitted against the modeled response of the real drivers in the real box: the two ways cross at 2 kHz within 5° of each other.
Trapezoid Baltic-birch cabinet
11 in across the baffle, sides splayed 12°, 28 L net with a front slot vent — it can sit against a wall or in a cluster.
Install hardware
Two NL4 connectors (input and link) on a recessed plate.
Penn Audio Install Line
Hear it in your room.
Tell us about the space and the program — we’ll spec the system around it.