Could you tell me what is the correct standard rms or lufs level and peak level for ringtones? Is there anything else relative with the making of a ringtone as a product that I should take into account?
I got the answer from Noikia Design Team: We usually master for "cd", around -10 RMS (or -14 RMS for softer songs) and peak at -0.2. We leave full bandwidth sound as it is, but apparently some manufacturers cut everything below 200 Hz.
Phone speakers typically can't reproduce much frequencies below 500 Hz. Also, 1 kHz can be a problematic frequency. If it's crowded there, the small speaker membrane may start 'rattling' in higher modes and that's not pretty :-) Always test in a phone or a couple of phones.