Home Sleek Audio Sleek Audio Sleek Audio SA1 Customisable Earphones Review These customisable earphones are well worth considering, especially if you're on a budget. Sleek Audio W1 Wireless Headphone Adapter Review Versatile and great sounding. Could this be the best wireless headphone adapter yet? Sleek Audio SA6 Customisable Earphones Review Ever wished you could boost the bass or dull the treble of your headphones? Sleek Audio could have just the thing.