HF-300 Sound Quality - Loudness and Distortion

Hi,
Just wondering if anybody has any comparative testing on the sound quality and loudness with this unit. I am not sure if mine is faulty or just the best that can be expected from the speakerphone.
Problem is (tested using n95 8 gig and n80) that once the volume is turned up to 70% or more the units sound is distoted terribly. Sounds like the speaker is vibrating and crackling. The symptom is like when you turn up the volume on any speaker beyond its capability which then gets that distortion/vibration effect.
That said when used below 70% volume its too soft to be useable for everyday driving conversations.
Golden question if you own the HF-300 also is can you put it on 100% volume and have loud and clear sound without any negative sound quality? May help if you mention what phone model you have tested youyr with also.
I really think it must be a fault as everything marketed and reviewd about these units states 'loud n clear'. Surely its meant to be used on 100% also without such distortion or why have 100% volume possible.
Message Edited by quozl on 25-Jul-2008 07:20 AM

Sorry to ask again but is the car kit installed with an additional single Nokia speaker or is all audio played through the car audio system (original car speakers)?
Most likely in the second case is that the installer has routed the audio incorrectly.
The kit has two outputs: stereo for music and mono for calls. Mono calls can be installed to run through the single Nokia speaker but musics should be installed to run throught the car stereo 'aux in' channel, hence the question about what audio is distorted.

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