M
User3757880
★★★★★
2026-11-07
Buon prodotto, affidabile e pratico.
① (Original box included) Fostex HP-A4 Headphone Amplifier / DAC
$145.20
$188.759996032715
30% OFF
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Product Details
Description
Specifications
Care Guide
Please note that I am listing the same product with and without the original box. The reason for listing two units is that while it's true that you can easily swap op-amps to enjoy different sound qualities, opening the case lid each time was stressful. Therefore, I enjoyed the amp with two units side-by-side to minimize stress. I believe this speaks to how interesting this headphone amplifier is.
I am selling the HP-A4 op-amp headphone amplifier as part of decluttering my PC desktop audio equipment. It was working perfectly until just now when I was listening to it. There are tape marks on the bottom panel of the case (where I had written down the type of op-amp inside, driver size, and screw locations for opening). There are also minor scratches.
The op-amp has been replaced with an OPA627AU. The original OPA2134PA will also be included, so please listen to the difference. Please note that a Phillips head screwdriver (size PH0) is required to remove the case (available at home improvement stores). I will also include five spare flat-head screws.
As this was used daily, please forgive any oversight of minor scratches.
Original box, instruction manual, warranty card, etc. are included.
Category
Headphone Amplifier / Dac
Brand
FOSTEX
Condition
Some scratches/marks
Shipping
Included in price (by seller)
From
Tokyo
Daily Cleaning: Use a soft brush or damp cloth to gently wipe away dirt. Avoid harsh chemicals. For mesh areas, use diluted mild detergent and a soft brush.
Drying: Air dry in a cool, shaded place after cleaning. Avoid direct sunlight or high heat, which can cause fading and glue deterioration.
Storage: Stuff with paper to maintain shape when not in use. Store in a dry, ventilated area to prevent mold. Rotate between multiple pairs to extend lifespan.
Usage Notes: Designed for basketball. Not recommended for hiking, long-distance running, or other specialized sports where different performance features are required.