Choosing Speaker for multi channel amp

[fatecasino]

Hi all,
after really long time I managed to fix my first multi channel amp ~22Watt (it's based on Taylor's tiny giant). I connected it to  a 30 watt 12" Vox guitar speaker.
2 channels are for instruments and 1 channel is dedicated to voice microphone.
Guitars and basses sound fantastic  , I really love this thing. My problem is that due to the speaker the microphone sounds not so good. Lots of frequences are missing and the voice sounds a bit like jamaica's studio one recordings. Not bad, great sound personality, but I would like something more crystal clear voice sound. It's definetely the speaker, because if I connect the amp line out to an active speaker the voice sounds GREAT!
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So, are there any other speaker options? Is there 30w 12" speaker that would give me this sound? full range?
If I add a passive cross over and a horn, will I get better results?  

[PBE6]

I think you're going to have enormous difficulty finding a happy medium. Vocals sound most natural through a hi-fi system (usually as clean as possible and with a wide frequency range), while guitar cabinets are all about colour (most notably with high-end roll-off starting somewhere around 5-6k, but also with the peaks and dips associated with construction materials, cabinet geometry, damping, speaker response, etc..).

Maybe the best bet is to make the cabinet as hi-fi as possible, then add a speaker simulator inline with the guitar input? Even with that approach I'm not sure you're going to love the sound, but I don't think installing a "hi-fi" simulator for the voice channel is even viable from a physics standpoint.

[GGBB]

Maybe the best bet is to make the cabinet as hi-fi as possible, then add a speaker simulator inline with the guitar input? Even with that approach I'm not sure you're going to love the sound, but I don't think installing a "hi-fi" simulator for the voice channel is even viable from a physics standpoint.

+1

Even bass guitar is not usually friendly toward guitar speakers as their dynamics at the low end can damage a typical guitar speaker. But bass and vocals can play nicely together through a 2-way PA-ish setup. I'd aim for what works best with the vocals and allows for deep bass, then tweak EQ for bass and do cab sim for guitar. I suppose some bass cab/amp sim couldn't hurt either.

[PRR]

Voice through guitar speakers often sounds "old time".

Voice+guitar, through the same amp and speaker at high levels, will distort each other badly.

If good vocals matter, use a separate system.

As Gord says, pre-effected guitar and clean voice through a well-powered PA works very nice. But that is a step up from Tiny Giant technology.

[fatecasino]

thanks for your advice!