Looks like fun, and you won't see yourself coming and going 
. I tinkered just a little, bored on server downtime. Personal preference changes, mostly. Accolades help a bunch, too. Those will put you within spittin' distance of the blaster HP cap.
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My second main is a Sonic/Energy and it's a fun build.
You're clearly going for the Smash/Lethal cap (which I rarely do) so I won't comment on that but I will mention a few choice differences. Personally, I don't cap my one because she has so many controls, it's rare anything's able to fire back.
If you're interested in control, I notice you have no Siren's Song. SS is potentially overpowered for Blasters, especially a single target specialist like Sonic/En. Almost everything is succeptible to sleep and so sleeping a whole spawn then going to town on them individually.
Shockwave is pretty awful to be honest. It's fun when you're on your own but it'll grab you a lot of aggro and is as bad as Gale at keeping you safe. As you've hit the Accuracy cap on this build, I'd drop Shockwave and pick up Siren's Song instead. Call of the Sandman will still give you your 6.25% recharge.
And no Shout? Shout is your most powerful attack and as you're going to be close range most of the time, it's a good choice. The rooting is long and annoying but its damage more than makes up for it.
Hope that helps a little. 
@Dante EU - Union Roleplayer and Altisis Victim
The Militia: Union RP Supergroup - www.themilitia.org.uk
If you intend to solo, I couldn't suggest Siren's Song more. I solod my Sonic/EM about 85% of the time leveling up and it was rather like playing a Dom - sleep the spawn, if you missed someone Screech him to stun and take him down, otherwise just choose your targets. Rinse and repeat. Very safe, very effective.
Global = Hedgefund (or some derivation thereof)
Yeah, no Shout. I actually didn't take it because I hate how it looks. I'm going for powers that emanate from my hands, and I didn't want to go BWAH at people, and the secondary show animation looks like I need a cape. >.>; So you guys think I should get Siren's Song? Hmmm. I wasn't planning on running Tough either. Let me see...
Also, there's an accuracy cap? I didn't know this.
I also use stun quite a bit; just earlier, I was locking down stun-resistant mobs with Stun and Screech. Here's my revised build. I got rid of BARF and got spirit sharks instead, which I meant to do in the first place.
Edit: Holy crap shout gives 17% defiance. Maybe I should take it. I'll check.
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So, I've played doms for a while. Controllers for less, but I figured I'd play something with less control and more damage, both ranged and melee. Looking over the sets, I noticed I never see sonic blasters in game, and thought I'd make a sonic blaster/blapper hybrid. I went Sonic for resistance debuff (and I actually like how sonic attacks can come from your hands now!) and EM because.. well, it's EM. Total Focus, Boost range, power boost, all awesome. And I decided on Mako for Bile Spray and Knockout Blow. Here's my build so far. Any recommendations?
Hero Plan by Mids' Hero Designer 1.942
http://www.cohplanner.com/
Click this DataLink to open the build!
Harmony of Discord: Level 50 Mutation Blaster
Primary Power Set: Sonic Attack
Secondary Power Set: Energy Manipulation
Power Pool: Leaping
Power Pool: Fighting
Power Pool: Leadership
Ancillary Pool: Leviathan Mastery
Hero Profile:
Level 1: Shriek -- Decim-Acc/Dmg/Rchg(A), Decim-Acc/EndRdx/Rchg(5), Decim-Dmg/Rchg(5), Decim-Acc/Dmg(7), Decim-Dmg/EndRdx(7)
Level 1: Power Thrust -- KntkC'bat-Acc/Dmg(A), KntkC'bat-Dmg/EndRdx(46), KntkC'bat-Dmg/Rchg(50), KntkC'bat-Dmg/EndRdx/Rchg(50)
Level 2: Scream -- Decim-Acc/Dmg/Rchg(A), Decim-Acc/EndRdx/Rchg(9), Decim-Dmg/Rchg(9), Decim-Dmg/EndRdx(11), Decim-Acc/Dmg(11)
Level 4: Energy Punch -- KntkC'bat-Dmg/EndRdx/Rchg(A), KntkC'bat-Dmg/Rchg(13), KntkC'bat-Dmg/EndRdx(13), KntkC'bat-Acc/Dmg(15), C'ngImp-Acc/Dmg/Rchg(15)
Level 6: Combat Jumping -- LkGmblr-Rchg+(A)
Level 8: Howl -- Posi-Dam%(A), Posi-Acc/Dmg/EndRdx(17), Posi-Dmg/Rng(17), Posi-Dmg/EndRdx(19), Posi-Acc/Dmg(19)
Level 10: Bone Smasher -- KntkC'bat-Acc/Dmg(A), KntkC'bat-Dmg/EndRdx(21), KntkC'bat-Dmg/Rchg(21), KntkC'bat-Dmg/EndRdx/Rchg(23), C'ngImp-Acc/Dmg/Rchg(23)
Level 12: Shockwave -- Posi-Dam%(A), Posi-Acc/Dmg/EndRdx(25), Posi-Dmg/Rng(25), Posi-Dmg/EndRdx(27), Posi-Acc/Dmg(27)
Level 14: Super Jump -- Zephyr-ResKB(A)
Level 16: Boxing -- Acc-I(A)
Level 18: Tough -- S'fstPrt-ResDam/Def+(A)
Level 20: Weave -- LkGmblr-Rchg+(A), LkGmblr-Def/EndRdx(29), LkGmblr-Def/EndRdx/Rchg(29), LkGmblr-EndRdx/Rchg(31), RedFtn-Def/EndRdx(31)
Level 22: Stun -- RzDz-Acc/Stun/Rchg(A), RzDz-Acc/Rchg(31), RzDz-EndRdx/Stun(33), RzDz-Acc/EndRdx(33), RzDz-Stun/Rng(33)
Level 24: Maneuvers -- LkGmblr-Rchg+(A), LkGmblr-Def/EndRdx/Rchg(34), LkGmblr-Def/EndRdx(34), LkGmblr-EndRdx/Rchg(34), RedFtn-Def/EndRdx(36)
Level 26: Screech -- RzDz-Acc/Rchg(A), RzDz-EndRdx/Stun(36), RzDz-Acc/EndRdx(36), RzDz-Stun/Rng(37), RzDz-Acc/Stun/Rchg(37)
Level 28: Build Up -- Rec'dRet-Pcptn(A), Rec'dRet-ToHit/Rchg(37)
Level 30: Amplify -- Rec'dRet-ToHit(A), Rec'dRet-ToHit/Rchg(39)
Level 32: Dreadful Wail -- Oblit-%Dam(A), Oblit-Acc/Dmg/EndRdx/Rchg(39), Oblit-Acc/Dmg/Rchg(39), Oblit-Dmg/Rchg(40), Oblit-Acc/Rchg(40), Oblit-Dmg(50)
Level 35: Power Boost -- RechRdx-I(A)
Level 38: Total Focus -- KntkC'bat-Acc/Dmg(A), KntkC'bat-Dmg/EndRdx(40), KntkC'bat-Dmg/Rchg(42), KntkC'bat-Dmg/EndRdx/Rchg(42), C'ngImp-Acc/Dmg/Rchg(42)
Level 41: Bile Spray -- Posi-Dam%(A), Posi-Dmg/Rchg(43), Posi-Dmg/EndRdx(43), Posi-Acc/Dmg(43), Posi-Acc/Dmg/EndRdx(45)
Level 44: Knockout Blow -- KntkC'bat-Acc/Dmg(A), KntkC'bat-Dmg/EndRdx(45), KntkC'bat-Dmg/Rchg(45), KntkC'bat-Dmg/EndRdx/Rchg(46), C'ngImp-Acc/Dmg/Rchg(46)
Level 47: Shark Skin -- RctvArm-EndRdx(A), RctvArm-ResDam(48), RctvArm-ResDam/EndRdx(48), RctvArm-ResDam/EndRdx/Rchg(48)
Level 49: Boost Range -- RechRdx-I(A)
Level 50: Musculature Total Core Revamp
Level 50: Pyronic Total Core Judgement
Level 50: Reactive Total Radial Conversion
Level 50: Clarion Partial Core Invocation
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Level 1: Brawl -- Empty(A)
Level 1: Defiance
Level 1: Sprint -- Empty(A)
Level 2: Rest -- RechRdx-I(A)
Level 4: Ninja Run
Level 2: Swift -- Run-I(A)
Level 2: Health -- Mrcl-Rcvry+(A)
Level 2: Hurdle -- Jump-I(A)
Level 2: Stamina -- EndMod-I(A), P'Shift-EndMod(3), P'Shift-End%(3)
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Set Bonus Totals: