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FiiO F9 and FiiO F9 Pro are noise-isolating ear phones manufactured and marketed by FiiO. They are aimed at listeners who prefer bass-heavy sound signature. They are rated as one of the best ear phones in its price range by CNET.

The earphones contain triple driver hybrid design with a single dynamic and 2 balanced armature drivers (Knowles BAs in the case of the F9 Pro) and two cables with MMCX connectors. Both F9 and F9 Pro received overall highly positive reviews. However, it was mentioned that MMCX connectors are too tight.

Sound, design and accessories
F9 and F9 Pro have V-shaped yet reasonably well-balanced signature with increased bass while utilizing almost identical technological design. The F9 has a three-driver design with a single 9.2mm dynamic driver and two balanced armature drivers whereby F9 Pro employs the Knowles TWFK-30017-000 balanced armature drivers.

Both versions come with two replaceable 1.2-meter cables, one is a standard MMCX 3.5mm TRRS with an inline mic and controls, made with tin-plated copper, the other is MMCX 2.5mm balanced cable made with woven core 5N purity oxygen-free copper, for use with some models of Astell & Kern portable music players as well as FiiO's players, DACs and amplifiers such as Q1 Mark II DAC & AMP. The structural design of the earphones includes ridges that were inspired by ripples that occur in water. They were utilized for better aesthetics, improvement of structural strength while creating more space inside, securing the drivers better and eliminating internal resonances in sound.

F9 Pro comes with a hard waterproof carrying case and a water-resistant neoprene carrying case, and includes 12 sets of tips, 3 bore sizes of silicone and 3 sets of memory foam tips. The F9 ear phones come in two colors: grey and red whereby F9 Pro comes in titanium color.

Reception
Steve Guttenberg reviewed the Fiio F9 for CNET, remarking favorably on it's build quality and design: "Build quality and design really are first rate, frankly the best I've seen for the money." He also remarked favorably on the sound mentioning that bass is bold and stereo imaging is wide open. However, he added: "it won't please persnickety audiophiles" who are looking for an absolutely neutral and clinical sound. He also added: "The F9 was a pleasure to listen to with well-recorded music, the sound was positively vivid, lively, and fun. The bass was terrific, and there was lots of it, but it was well-behaved and tuneful."

Gabby Bloch reviewed the Fiio F9 Pro for MajorHiFi remarking favorably on the bass "The lows might be the defining quality of the FiiO F9 PRO. While I wouldn’t call these headphones incredibly bass heavy, they do a fantastic job in the bass department." He also noted that the imaging is precise however soundstage doesn't have much width. He concluded: "But in general, these F9 PRO are great value for money and can compete with the higher priced market."