I would also love to know!
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I have the HP integrated. Upgraded from the Prologue 2.
Its a fabulous piece that I found lives up to its Stereophile review and owner raves.
Asking if it's "worth it"or a small/large improvement really is subjective. You may need to do an A/B comparison to really determine if the improvement is worth it to you.
I can only imagine it's an even tougher call since you have a Dialogue, which already rises above its price point.
Perhaps calling the distributor, Kevin Deal@ Upscale Audio will help.
I have a DiaLogue One, which I love, paired to a pair of Sonus faber Elipsa SE’s. I got the chance to play with an HP at home for a few days and found the results very interesting. I posted my thoughts on this board not too long ago (you can read more here:
...but, in short, I ended up keeping my DiaLogune One. :)
After a year I couldn't be more happier with the Premium especially with KT-77 and Cifte tubes recommended by Kevin. The Premium with these tubes have a beautiful midrange and the best soundstage and holographic sound I ever had in the 40+ years of being an audiophile. I also replaced the Focals with Lawrence Violin SE speakers which sound wonderful with the Premium. The Focals with the beryllium tweeters were a bit too bright for my tastes.
So the answer to your questions, Was it worth the price difference, I would say yes. As to the improvement, was it large, no but there was a difference that I'm glad I made the purchase. Either PL dialogue integrated amps are a best buy in my book.
BTW- the icing on the cake was replacing the stock fuse with an Audio Horizons Platinum fuse. This fuse added another dimension to the sound that I was able to hear further into recording and more detail.