Graham Audio LS5/1 是經典 LS5/1 的前身，並使用 Plessey 和 GEC 的商用驅動單元。需要兩個高音揚聲器才能達到所需的功率處理能力。對於 LS5/1（但不是 OB 版本）（LS3/1 較小，使用密封外殼並將高音揚聲器放置在低音揚聲器前面），上部高音揚聲器會在較高頻率下滾動，以避免當兩個源之間的間距與波長相當時，兩個源會產生相同的輸出，從而產生聲波瓣效應。
低音揚聲器為15英寸，這在當今國內市場上幾乎是聞所未聞的。使用現代材料和技術，我們的裝置比 Plessey 原始裝置大大提高了功率處理能力和頻寬。
當然，對於如此大的低音揚聲器，“光束”在其操作的高音域是一個嚴重的問題。 BBC 對此的回答是使用插槽加載，因為許多人已經見過 Graham Audio LS5/5。這種方法確實有助於改善離軸響應，使得在典型的家庭聽音室中使用更大的驅動單元成為可能。
落地式音箱採用傳統的 BBC 方法（相對！）薄面板，透過大量負載將共振移離關鍵的中頻區域。採用手工精選的高品質飾面，格柵透過隱藏式磁鐵固定到位，因此可以根據需要輕鬆拆卸。
Specifications:
System: 3 way reflex loading.
Enclosure: Damped MDF, floor-standing.
Finish: Real wood veneer.
Dimensions: 103cm (h) x 48cm (w) x 43cm (d).
Weight: 42.0 kg each.
Frequency Response: 37-18kHz +/-3dB.
Nominal Impedance: 8 ohms.
Sensitivity: 89dB/2.83v/1m.
Maximum Output: Over 110dB for a pair at 2m.
Bass/Midrange: 380mm.
Tweeter: Two 25mm Soft Dome.
Recommended Amplifier Power: 50 – 250 watts unclipped programme.
Crossover: 1.6kHz, 22 elements.
Brand
GRAHAM AUDIO - UK
Graham Audio is a British family-owned company headquartered in Newton Abbot, a small market town in Devon, southwest England. We are passionate about high-quality audio and believe that classic BBC loudspeaker design offers a neutrality, transparency, and authenticity that is hard to find elsewhere today. Using modern components and production techniques, we are able to maximize performance while maintaining the original design.
All loudspeakers are hand-assembled on-site. One person oversees every step of the production process, including testing and auditioning. A second person carefully inspects the finished product, repeating the tests as a matter of course and saving the results for future reference. As part of the testing procedure, all completed loudspeakers are compared to our master reference samples to ensure complete consistency.
Graham Audio is proud to work with some of the best minds in the industry, including Derek Hughes and Volt Loudspeakers. Our loudspeaker systems are available from carefully selected dealers worldwide, who have full demonstration facilities and will support you through the selection and setup process.
