iFiiEMatch 2.5 mm Male to Female Headphone Jack In-Ear-Monitor Audio Amplifier/Optimizer/Attenuator. Includes Soft Foam Ear Plugs, Travel Pouch, and Airplane Adapter

While it's not cheap it fixed the noise floor on my amp. On 4.4 balanced on +6db I hear no hiss unless I max the volume. Before I got this I would hear hiss on my IEMs at half volume at 0db on single ended. Has let my enjoy my music so much more at home

They're under-selling this product by using the term 'lowers HISS'. It not only lowers hiss, it lowers the whole noise floor, which makes a very noticeable difference to the trained audiophile ears. Don't know how this product manages to do this, but it's kind of producing the DSD type sound - less noise floor and more dynamic and deeper sound.I'm happy with the quality of the results produced by this product, however, I think it should have been priced lower. How expensive the cost of this product would be, I doubt that it'll be more than $10. And yet they sell it for £59. I would have given it 5 stars if the price was right.

First off there is no airplane adapter with the 2.5mm version.Second the balanced version is maybe a little overpriced.However it works exactly as it should and allows me to use my sensitive iems with my mains powered amps. Without this gadget I get annoying hiss and with it, on high setting I get no hiss.So I recommend it if this is what you may wish to do.

I use this with Earmen Sparrow, Qudelix 5k and ifi Go Blu dongle DACs. Previously these could not be used with my best earbuds due to the bud's sensitivity-Noble Kaiser and Campfire Solaris. With this device the hiss is removed and the sound via my Moto G8 phone is fantastic.Superb product!