From a technical standpoint, an adapter should not have any effect on sound quality (provided the adapter does not contain active or attenuation circuitry, which most do not). If you anticipate flying helicopters for any length of time, a high quality ENC headset is highly recommended. If you have not had the experience of using one of these, give it a try - the difference in noise level is huge. I have had a great experience with Bose products and recommend the A20 model.