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PLEASE match Advice Pass Labs X350.5 (20k) to Hovland HP-100 (2500ohms) Miss-match ???

GUYS / GALS NEED YOUR HELP PLEASE!

A friend said this preamp is outstanding and will sound great with Pass Labs amps and to not get caught up in the specs but the measurements say different.

Pass Labs X350.5 amplifier with input Impedance 30k ohms Balanced or 20k ohms Single ended* 
(*source Pass Labs Manual)  

Hovland HP-100 source impedance 2500ohms* 
(*source Stereophile) 

Guys / Gals, can I used my Pass Labs X350.5 amp with Hovland HP-100 preamp? Has anyone used Pass amps with Hovland pre's. I will be using Magico S5 Speakers and Bricasti M1SE DAC but want it to sound the best it can. Should I just stick with the Aesthetix Calypso pre I was leaning toward before my gut said to go for the Hovland HP-100

Hovland HP-100 Preamplifier: * Output impedance: approximately 2500 ohms or according to Atkinson, Hovland HP-100 (2500ohms) its source impedance was high at 2.4k ohms, rising to 4.3k ohms at 20Hz. The partnering power amplifier would best have an input impedance of at least 47k ohms if the bass is not to sound lean*. The Pass Labs doesn't meet the x10 requirement it is supposed to but it is sort of close when looking at it. What do you guys think? I am not sure what to do but you guys will know what to do?

Stereophile: Its input impedance was a usefully high 100k ohms in the midrange and bass, with just a small reduction to a still-high 86k ohms at 20kHz. Despite the claim that the HP-100 uses a cathode follower output stage, its source impedance was high at 2.4k ohms, rising to 4.3k ohms at 20Hz. The partnering power amplifier would best have an input impedance of at least 47k ohms if the bass is not to sound lean.

Read more at https://www.stereophile.com/content/hovland-hp-100-preamplifier-measurements#YZXZfGLbbL2COkLR.99 https://www.stereophile.com/content/hovland-hp-100-preamplifier-measurements#YZXZfGLbbL2COkLR.99
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audioconnection
1,015 posts
 
You will love the K1
The first time i heard it was magic.
I never knew Cowboy Junkies Trinity Sessions Margo Timmons was also singing with the support of her brother softly but so vividly in the background.Luka Blooms 12 string had life that was kind of magic 
 Let it run in for a bit after about four days or so and you should get what I heard.
 Best JohnnyR
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jmcgrogan2
6,346 posts
 
The Ayre and the Pass Labs are both great SS preamps. They will both work great with the proper surrounding components.
That said, I find it odd that you have heard that the Pass Labs unit can be sterile, while no one finds the Ayre to sound that way.
This does not mimic my impressions, but c'est la vie.

Personally, I have no desire to ever return to a SS preamp.
However, if forced to pick a SS preamp, my clear preference would be a 7 series unit from Klyne Audio Arts.
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fsmithjack OP
605 posts
 
Thanks audioconnection - i love that album - ill listen for it.

jimcgrogan - those statements about pass xp10 being sterile i should have been explained a bit more and have to be taken in context though - as they relate to tube amps. They can also be more dynamic and precise so never knocking pass pre - I love pass products but to be fair the xp10 is the entry level pass product vs a reference cost no object preamp. If I could had got a xp20 but those are 3 times the money
 . 


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fsmithjack OP
605 posts
 
OK guys - went to bed - done deal - buying the Ayre K-1xe but woke thinking man I am going to want some tubes -awwwe...

Opinions guys - I am deciding soon - if you had to choose what do you think - they are only a $200 apart price wise.

CJ ET3SE - full warranty with about 20 hours on it

Ayre K-1xe - upgraded to xe in 2010

If you had to choose one right now what one? 

other gear recap

Magico S5 Speakers - (being delivered today - so excited :) 
Pass Labs X350.5 amp
Bricasti M1SE DAC
microRendu w/Uptone Audio ISO Regen, Amber Regen, (2) LPS-1, JS2
HiDiamond Full Loom and matching conditioner
(3) Verastarr Grand Illusion Signature II AC cables (dac,pre,amp)
(2) Sumiko S.9 Subwoofers (hopefully not needed w/Magico's)

Just need to decide is CJ ET3SE or Ayre K-1xe will match the best with my gear above

Room 15 x 24 w/cathedral ceilings set up on the long wall

Music - typical mix but no hard heavy metal or large scale orchestra but most everything else. 



audioconnection
1,015 posts
 
(((Pass Labs X350.5 amplifier with input Impedance 30k ohms Balanced or 20k ohms Single ended*)))
I love tube preamps don't get me wrong.
in your unique situation with regard to the lowish input impedance,
 the only reason to install tubes would be the well-intended committee peer pressure agreement choice.
Most of the folks offering advice are not running tube preamps into lowest impedance amps or suffered the bleak lifeless consequences.
so, in reality, they believe in their bias.
  its a choice of optimization of course if your not totally blown away
 w K1 you can easily sell it for close to the deal you picked it up for and have this experience under your belt and revisit with the expectation of differnt results. My ten buck says you'll be way too busy enjoynig music
 JohnnyR 
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