Head Sonic Pro String Review

There are a lot of poly strings out there that are all about the control and spin. Head Sonic Pro brings a little bit more to the table though with higher than expected power to go along with some decent control and spin.

As polys go, the Head Sonic Pro brings good all-around playability rather than just focusing on a few key traits.

This means that Sonic Pro is more accessible to the average player than some of the more control-oriented polys out there. 

This was my string of choice for a few years during college before I switched to Babolat RPM Blast and there were a lot of qualities I liked about it.

What you find with polys is that they’re great if you want spin and control, but they often don’t give you too much in the way of power, feel, and comfort.

If you’re not used to the way the poly strings play then they can lead you to wonder why anyone would ever play with them.

They tend to have a very deadened feel to them that means if you don’t swing through with a lot of racket head speed you don’t see any results.

There’s no power to be had without putting a ton of energy through the strings.

Head Sonic Pro is a bit more forgiving than many of its poly cousins like Solinco Hyper-G, Babolat RPM, and Big Banger Original though, which is great for the players who want a blend of qualities as opposed to all-out control and spin.

My game has changed a bit since I used the Sonic Pro and now I thrive on the added control of the RPM Blast, but I do miss some of the aspects of the Sonic Pro.

Don’t get me wrong though, this string hasn’t revolutionized polys. It’s still pretty low powered in the grand scheme of things, and it’s comfort levels are still not great.

However, what you do get is a slightly different blend of power, spin, and control that is likely to suit plenty of players.

For this playtest, we strung a couple of Babolat Pure Strike 18 x 20s up with Sonic Pro, one at 54lbs, the other at 44lbs.

This just helps us to get a better feel for how the string performs at different tensions.

We know the Head Sonic Pro is a good string but there are lots of good polys out there, so, would we suggest the Head Sonic Pro to you?


6.5out of 10

We did say the Sonic Pro was pretty powerful for a poly and this is what a good power score for a poly looks like.

You might be thinking this is a pretty terrible score, why would anyone want something so underpowered?

The thing is the way people generate power differs.

If you’re someone with extremely explosive swings then you want to generate your power through swing speed and use the strings to control that power.

If you play with slightly more gentle swings then you might look to the strings to generate more of your power.

For beginner players who don’t have fully developed swings yet, a 6.5 power score is not enough, but for most other players, there’s plenty you can do with this string.

If getting power from your strings is your number one concern then this string is not for you but if you like a good middle ground then it’s worth looking at.

Head Sonic Pro gives you a little bit more power than something like the Babolat RPM Blast but it’s still not one of those strings that’s going to blow you away with its power.

We gave it a 6.5 out of 10 for power.


8out of 10

This is one of the main reasons people get into poly strings – the control.

There are multifilament strings out there that offer decent control like the Head RIP Control, but generally, if you want the best control you go poly.

Again, the Head Sonic Pro offers a bit more of a middle ground in this area.

It’s not got the crazy levels of control that something like RPM Blast does but it’s got more than enough for the average player.

If you’re playing with medium to medium-fast strokes then I think you will like how Sonic Pro balances control and power.

When I was playing with the racket strung at 44lbs I did have a lot of problems though.

I’m used to playing with a much higher tension and I did feel the Sonic Pro didn’t have enough control for such a low tension.

I was much more comfortable at 54lbs and played better tennis.

Of course, you can always adjust the way a string plays by changing the tension.

A lower tension will offer you a bit more easy power whereas a tighter tension will give you more control.

Check out Tom’s Tennis String Tension Guide for a little bit more information on this.

The Head Sonic Pro scored an 8 out of 10 for control which is a good score in general, but nothing special for a poly.


6out of 10

This was an area where I felt I wanted a little bit more from the Head Sonic Pro.

Because this string did feel slightly softer than some polys I thought I would get a bit more in the way of feel and touch but it wasn’t necessarily the case.

I find touch a little bit difficult to score because everyone looks for something a bit different in this aspect.

Some people find touch from rackets that are strung like boards and some people find touch from rackets that are strung like trampolines, so everyone’s going to have their own opinion.

For me, the Sonic Pro was very much in the middle of everything it wasn’t particularly stiff and it wasn’t particularly soft.

If you’re looking for something that gives you a little bit of everything then this is probably a pretty good option.

The feel from the Head Sonic Pro wasn’t mind-blowing, but it certainly wasn’t bad.

I thought it might do a little better in this area because it’s not as stiff as many polys, but still, 6 out of 10 isn’t a bad score.


7out of 10

Spin is another strong area for almost all poly strings.

They’re what have helped modern players develop the topspin based, big hitting gamestyles that we see today.

As polys go though, the Head Sonic Pro doesn’t have great spin potential.

There are two ways to look at this.

On the one hand, you can say that spin is absolutely vital to your game and stick to a more spin friendly string like Solinco Hyper – G, or you can recognize that there can be such a thing as too much spin.

We all produce spin naturally with our strokes, and we don’t necessarily need the strings to do as much work for us as they do.

I know I personally have a lot more problems flattening the ball out than I do hitting topspin.

The nice thing about the Head Sonic Pro is that it doesn’t push you too far one way or the other.

You can create the topspin when you want to, but it also allows you to hit quite flat with minimal effort.

It’s another area where the Sonic Pro gives you a nice middle ground to play with and the Head Sonic Pro gets a 7 out of 10 for spin.


6out of 10

I found the Sonic Pro’s comfort to be a lot like it’s touch – I wanted a bit more.

Compared to a lot of poly strings you’ve made a sacrifice on control and spin, so I expected it to come back to me in touch and comfort.

However, I just didn’t find the Sonic Pro did it for me when it came to these areas.

Poly’s aren’t comfortable strings to play with generally but there are exceptions and I thought the Head Sonic Pro could be one of them.

In general though, the Sonic Pro was fairly harsh to play with, just like my Babolat RPM Blast.

This isn’t the end of the world.

It’s certainly something you get used to the more you play with a string, but for players coming from a more comfortable, multifilament string, it might be a bit of a shock.

I’m fairly used to this feel from my strings so it didn’t bother me but I did hope for a little bit more in this area.

A score of 6 out of 10 isn’t too bad for a poly but I thought there was room for improvement in this area.


7.5out of 10

Nothing wrong with this score!

The Head Sonic Pro offered very reasonable durability and kept its performance throughout the week I playtested it.

These poly strings are designed for players who are taking big swings at the ball, so rest assured, you won’t be constantly restringing your racket with this string.

This is one of the most important areas for me when it comes to string.

I don’t want to be spending all my time getting my rackets restrung so I need a durable string and the Head Sonic Pro does the job in this area.

The Sonic Pro keeps its performance well and lasts a long time, we gave it a 7.5 out of 10 for durability.


7.5out of 10

Overall, I think it boils down to whether you look for a string which is very equally balanced or whether you want certain standout qualities.

I’d say in my case I want certain qualities, with control begin number one, durability number two and spin number 3, but there are lots of people who want a bit of everything.

If you are someone who wants a little bit of everything then the Head Sonic Pro is a very good string.

I would have liked it to do a little bit better in comfort and touch but you can’t have absolutely everything.

The touch and comfort is something you get used to with time, so I wouldn’t let those put me off this string and would certainly recommend it as a string to try.

We gave the Head Sonic Pro a 7.5 out of 10.

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