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Alessandro headphones look exactly like Grado headphones. This is because Alessandro headphones use Grado parts for their housing. Inside the ear-cups are drivers designed by George Alessandro. In totality, the sound is similar to Grado's, but not identical.
The Music Series Pro uses the same housing as Grado's RS1. This means it uses the same mahogany ear-cups, the same leather headband, the same adjustment polls, and the same cable. It is inside the ear-cup where differences lie.
I happen to prefer the sound of the MS Pro overall. It possesses a more neutral tonality. Because of this, I feel it suits a wider variety of genres. Out of all the Grado headphones that I've had the pleasure of hearing, the MS Pro's sound signature most closely resembles the HP1000. However, the MS Pro lacks some of the refinement which the HP1000 offers. Ultimately, the HP1000 is a superior sounding headphone, but at its price, the MS Pro is a better value.
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If I had to choose between the RS1 and the MS Pro, I would choose the MS Pro. I prefer its more neutral tonality. Both happen to be excellent mid-priced high-end headphones. Of the headphones which I own, I find that the MS Pro is the best on-ear headphone currently in production alongside the Ultrasone Edition 8. While I have spent time evaluating the Grado PS500, I do not own it. When I've compared it against the MS Pro, I have found that I prefer the MS Pro.
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