Overview

The Behringer PK108 is a compact 2-way passive PA loudspeaker with an 8-inch LF driver and 1-inch compression driver. It’s rated at 320–350 W peak, sensitivity 96 dB (1 W/1 m), with 70°H × 50°V coverage, and weighs about 11.2 lb (5.1 kg). Connectivity is via two 4-pin speaker twist (speakON-style) jacks (input/link), plus a 35 mm pole socket for mounting. [1][2][3][4]

Scientific Validity

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With no credible third-party measurements located, we start from 0.5 and adjust. Manufacturer-published data shows 87 Hz–35 kHz (±3 dB) / 20 Hz–20 kHz (−10 dB) and 96 dB sensitivity (1 W/1 m). [2][3] The high LF cutoff limits full-range fidelity, and the 70°×50° pattern implies modest uniformity in larger spaces. Absent verified THD/IMD and max SPL data, audible transparency is limited, hence 0.4. [1][4]

Technology Level

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A conventional 2-way passive network (≈2.2 kHz crossover) in a molded enclosure with no notable proprietary acoustics or advanced networks. It’s pragmatic but not innovative, so below industry-average sophistication. [2][4]

Cost-Performance

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Current market price (denominator): 70.90 USD. [5]
We searched for the cheapest equal-or-better passive alternative. Rockville’s RSG8 is cheaper at 64.95 USD but lists 90 dB sensitivity (≈6 dB lower than PK108), and 300 W peak vs PK108’s 320–350 W—both indicating inferior output capability; therefore it does not meet the “equal-or-better performance” requirement and cannot be the comparator. [6][7]
Conclusion: No cheaper product with equal-or-better user-facing functions and measured performance found → CP = 1.0 (by definition, world-cheapest among equivalents).

(For clarity only: if RSG8 qualified, the raw division would be 64.95 ÷ 70.90 = 0.915…, but it doesn’t qualify.)

Reliability & Support

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Global distribution and standard warranty under Music Tribe. Passive architecture reduces failure points, but independent long-term durability data is scarce; overall, approximately industry-average support and reliability. [1][4]

Rationality of Design Philosophy

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The design trades bandwidth and uniformity for portability and cost with no occult claims—reasonable for speech and small-PA utility. It doesn’t push toward transparent benchmarks, but the choices are coherent for the price target. [1][2]

Advice

Choose PK108 when you need the lowest possible entry cost for speech reinforcement or very small gigs/monitoring. For music programs needing deeper LF, higher output, or documented low distortion, consider stepping up within Behringer’s range or competitors that publish comprehensive measurements; verify frequency response, sensitivity, and distortion before purchase. [2][4]

References

[1] Behringer, “PK108/110/112/115 Quick Start Guide (V1.02)”, https://cdn.mediavalet.com/aunsw/musictribe/GONP5dfH0kqtKkjYHnKFWw/pYN2FC29ok-epiaP1MKyLQ/Original/QSG_BE_0313-AHN_PK108_PK110_PK112_PK115_WW.pdf, accessed Aug 19, 2025 (connectors, coverage, sensitivity, dimensions/weight)
[2] Guitar Center, “Behringer PK108 320W 8 inch Passive Speaker — Specs”, https://www.guitarcenter.com/Behringer/PK108-320W-8-Passive-Speaker-1500000420989.gc, accessed Aug 19, 2025 (87 Hz–35 kHz ±3 dB, 2.2 kHz, sensitivity)
[3] B&H, “Behringer PK108 Specs”, https://www.bhphotovideo.com/c/product/1821691-REG/behringer_pk108_passive_320w_8_pa.html, accessed Aug 19, 2025 (−10 dB/±3 dB ranges)
[4] Thomann, “Behringer PK108”, https://www.thomannmusic.com/behringer_pk108.htm, accessed Aug 19, 2025 (max level listing, coverage, connectors, size/weight)
[5] Alto Music, “Behringer PK108 Passive 320W 8 inch PA Speaker System”, https://www.altomusic.com/products/behringer-pk108-passive-320w-8-pa-speaker-system, accessed Aug 19, 2025 (70.90 USD price)
[6] Rockville Audio, “RSG8 8 inch 300 Watt 2-Way 8-Ohm Passive DJ/Pro PA Speaker”, https://www.rockvilleaudio.com/rsg8/, accessed Aug 19, 2025 (90 dB sensitivity, 55 Hz–20 kHz, 300 W peak)
[7] Amazon.com, “Rockville RSG8 300W 2-Way 8-Ohm Passive DJ/Pro PA Speaker”, https://www.amazon.com/Rockville-RSG8-Passive-Speaker-Mountable/dp/B00G403ZE8, accessed Aug 19, 2025 (64.95 USD price)

(2025.8.20)