I haven't personally tried this, but here's a guide for exactly what you want 
to do--see the first reply to the topic:
http://www.applevis.com/forum/os-x-mac-app-discussion/bypassing-upper-speech-rate-limit-os-x-voices
> On Mar 20, 2015, at 9:47 PM, Christopher-Mark Gilland <[email protected]> 
> wrote:
> 
> OK, I don't know if this could be done via a PList preference file, or 
> something similar, but is there a way to increase the maximum volume of a 
> particular voice in Voiceover?
>  
> Here are the more specifics.  I've been using Alex, but honestly, I prefer 
> Fred.  Some of you all might totally disagree with me on that preference, but 
> honestly, I couldn't care one lick less if you do!  It's what I like, so get 
> over it!  Anyway, the only issue is, I find that even set to max volume in 
> the Voiceover utility, Fred is a little bit quiet.  Yes I know about the 
> Vocalizer voices that are available.  Can't stand 'em!  Anyway, I know 
> they're louder.  Again, I say, can't stand 'em!  So, my point is, with 
> Fred... is there a PList file I could manually edit by hand or something 
> similar which would let me either uncap, or at least! slightly raise the max 
> limit on the volume?  It's not like I'm gonna blow my speaker.  I don't need 
> it going up louder by much.  Only by just a couple of notches.  Just enough 
> to bring him about to the same max volume as Alex.
>  
> Chris.
> ---
> Check out my web site at:
> http://www.clgproductions.net <http://www.clgproductions.net/>
> 
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--
Have a great day,
Alex Hall
[email protected]

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