Motorola Z6c World Edition
My wife has the same phone and she has the same issue. Bluetooth volume is very good.
I called Motorola and the person I spoke to was absolutely clueless. She told me to mail my phone back to them to check it.
They need to release a firmware update that increases speakerphone and handset volume.
I called Verizon support this week about a billing question and used the speakerphone. At top volume (level 7) i was barely able to hear the representative.
That is why I feel the speakerphone should be a bit louder.
I have looked for tweaks on the web, but for the most part, the gaintable adjustments do not work for CDMA phones.