PlusSound Allegro

Sound Analysis.

I analyzed Allegro sound performance paired up with LPGT while playing a variety of test tracks, such as Agnes Obel “The curse”, Sandro Cavazza “So much better” (Avicii remix), C-Bool “Never go away”, Ed Sheeran “Shape of you”, Alan Walker “Darkside”, Galantis “Hunter”, Iggy Azalea “Black widow”, Indila “Boite en argent”, Dua Lipa “Love again”, Counting Crows “Big yellow taxi”, Bob Marley “Jamming”, David Elias “Vision of her”, and Michael Jackson “Dirty Diana”.  The sound analysis was done after 100hrs, so it has plenty of burn in time.  Also, PS Allegro was tested with Crystal eartips and PS Silver+ cable.

I found Allegro to have a balanced sound signature with a clear detailed tonality and a vivid sound presentation.  Its balanced W-shaped sound signature puts emphasis on each frequency group.  As the result, you will hear a linearly tuned lows with a textured sub-bass rumble and a rounded mid-bass punch; a neutrally colored lower mids with more naturally colored, detailed upper mids; and crisp, clear, and revealing, yet still non-fatigue highs with an extra zing around mid-treble which gives sound a higher resolution and a more vivid presentation of upper frequencies.

This is the type of tuning I’d like to refer to as having a tribrid coherency.  The drivers do work in harmony, but they don’t blend in together like one big dynamic driver.  Every frequency group is distinct, and you can easily shift your focus from the weight and the impact of lows to a clear, detailed, natural tonality of mids/vocals, and then vivid details of a clear and crisp treble.


The quantity of the bass and the treble will depend on eartips selection which can noticeably affect the sound tuning.  This is common with many iems and obviously very subjective since eartips selection is dependent on our own ear anatomy.  But I still want to bring this up to everyone’s attention since I had to dip into my stash of eartips outside of the ones provided by PS to find the right tonal balance which sounds good to my ears.

The Allegro soundstage is big and quite expanded in all 3 directions, having a decent width, depth, and height, though I felt like the sound is more in front of you rather than wrapping around you.  This creates an expanded space and imaging in front of you rather than putting you in the middle of holographic image.  Layering and separation of the sounds is pretty good, zero congestion and muddiness, everything is easy to distinguish.

Also, the tuning works quite well with any genre of music.  Doesn’t matter what you throw at these iems, they were able to handle everything with ease.


Eartips Selection.

The selection of eartips is crucial to any universal in-ear monitors and will affect the sound, especially the bass impact depending on the seal.  Due to a large opening of my earcanals, I usually go for the largest size eartips to get a better seal.  Also, please keep in mind, eartips impressions are subjective and will be based on anatomy of your ears.  Here, I’m just describing what I’m hearing with mine (ears) while comparing Allegro stock eartips and other aftermarket alternatives.  Furthermore, due to the shape of the shell and shorter nozzle, you also have to make sure IEMs stay secure in your ears.

Stock silicone – balanced sound sig, strong bass impact and deep sub-bass extension, thinner lower mids, brighter more transparent upper mids, and crisp bright treble.

Symbio W (stock) – slightly more mid-forward sound sig with bass losing a bit of the impact while upper mids gaining more energy along with crisp and vivid treble.

Comply foamies (stock) – smoother balanced tuning, with strong bass impact, organic mids, and smoother natural treble.  I’m not a big fan of Comply eartips comfort (it irritates my ears), but they actually work quite well here.

Final Type-E – balanced revealing tuning, strong bass impact, neutral lower mids, more forward upper mids, and crisp and vivid treble.

Azla Crystal – very similar to Type-E with balanced revealing tonality, a bit deeper sub-bass (probably due to a better seal with my ears), clear detailed mids, and crisp and vivid treble with a little more air.  I also tried their latest Max, but treble was a bit too hot.

Symbio F – very similar to Type-E, having balanced revealing tuning, still having a strong bass impact and clear and detailed upper mids, but the treble is a touch smoother.

SpinFit W1 – even the largest size didn’t stay secure in my ears; these use a softer silicone that didn’t work for me in this particular combination.

Crystal and Symbio F were my preferred eartips which offered both, a secure fit and a perfect sound balance to my ears.


Page 3 – Cable pair up and Source Pair up.
Page 4 – Comparison and Conclusion.


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