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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Thank you for the kind words!  Fedex tracking says the P10 and BAT should land tomorrow. Can’t wait to get home from work tomorrow night! Great thing being an Audiophile when making changes it’s like Christmas for grown up’s :) love it 😍 
Hey guys - I have some new developments in my system that I had shared in my other threads and wanted to share with you guys also. Thanks 

Hey guys - wanted to update you. I got the BAT VK32SE and my PS Audio P10 Conditioner from Fedex and have had a chance to install and listen a bit and these adds allow me to see right away where and how they fit or don't fit..

Like I said I am learning and working toward building my new system re-fit and figuring it out on the fly. I know I am going to make mistakes because most all my buys are without listening first. I know not ideal but also most items I am buying are used so that is sort of the price of this approach. Saves a ton of money but I also don't get to try in my own system first but also buying used and properly allows me to re-flip the items that are not the fits I am looking for.

This said here we go.

I know it is very early but right out of the gate the BAT is not for me. Great preamp and nice and warm and sounds great but these Magico speakers are so transparent and so resolving that they crave - require and demand nothing but the most transparent and neutral components in the chain.

The BAT just provides a bit too much in terms of moving away from neutrality.

I now understand why all you guys want components that are dead neutral. I never got that before but I sure do now. Clear as day!

Once your system gets to a level of transparency where every little change really is highlighted and effects the whole you want everything else that is added to not take from that.

The BAT is sweet and has great bass and sounds great but I have been running my Bricasti direct and realize just how much more I appreciate that sound vs what a tube preamp offers.

Maybe another tube preamp that is more neutral would be more to my liking but I am on the transparency train now and its hard to add anything that doesn't help scrub that window clean and make it as clean and as pure as possible where the BAT added too much tint to that window. A pleasant hue of tint but I tint none the same and many of you told me this and I want the glass in that window as pure and as pristine as i can get it and would love help and feedback from you guys.

Many of you called this but it was important for me to try a decent tube to get that doubt out of my mind and sort of flush my brain of that idea. Sure tubes can add so much that is desired but in my situation the trade off's where too steep of a price for me and one I am not willing to pay.

What do you guys think?

I am thinking Solid State preamp. Ayre K-1xe or maybe a Mark Levingson 326s. I would love a Pass XP20 but none out there used and the XP30 way too much money and the XP10 might now be able to outdo my Bricasti direct. Decisions / decisions.

Also, the PS Audio P10 is fantastic. I love it and it was a nice add on the neutrality and transparency front so happy about that.

I am batting 500 liking 1 out 2 of my last changes/adds.

Also, on my new focused path of neutrality and transparency I am making another speaker cable change. I know a couple weeks is very quick for these changes but in light of what I have learned it makes sense to me.

I switched from HiDiamond D8 to Cardas Clear Reflection speaker cables. My main reason at the time was my speakers with the former cables were incredibly bright and I wasn't happy with my speakers and this cable change and the added break was very helpful to fix this.

The bottom line is the HiDiamonds and the Magico's were not a good match so I pulled the trigger and made the change. I went to warmer and richer cable which was a nice change but the cable is a warmer and richer cable. I want neutrality and transparency so I today pulled the trigger on a cable change.

I sold my Cardas Clear Reflection speaker cables for the same price I paid for them so no financial pain there but they did help me learn more about my speakers and my preferences as it relates to these speakers. Also, what drove this is my ideal cable came available so I pulled the trigger. These were more money than the Cardas CF cables. Not a ton more and but a few hundreds more not crazy expensive considering the buy sell road i take but I am hoping this will be a nice change because these are a more higher end cable and well thought of cable and are known to work great with Magico's

Kubula-Sosna Emotion 2.5 meter Speaker Cables. I am hoping these are great. I am hoping these and a solid state preamp rather than a tube preamp will get me closer to where I want to go. Both changes are chasing that neutrality and transparency goal. There is always the fear of going too far the other way so that is why rather than a Nordost or a silver cable I went with the Kubula-Sosna Emotion as they are known to be a musical cable yet quite transparent.


I think my guiding goals are now transparent, musical and neutral and in this order is this is what will drive all my future decisions and not sure I could own this so confidently without my trial error process of trying on this BAT tube preamp.

What do you guys think?

Any good SS preamp idea's?

Any of you guys here these speaker cables I just bought?

Thanks as always for all the help.

Hmm, you bought the BAT VK-32SE because you complained that the S5's were too bright. I warned you just how warm the VK-32SE was.
I'll also tell you that Kubala-Sosna Emotion cables will be warm sounding, possibly even warmer than the Cardas Clear Reflection.
I understand that you may fear too revealing cables like Nordost, but with K-S, you went the other way, IMHO.

As for a more neutral preamp, of the SS preamps you mention, the Ayre K-1xe would probably offer the most resolution.
If looking for another tube unit, look for a VAC or ARC preamp, both offer higher resolution than BAT.

Let these items settle in before making a final judgement. For instance, even though the Emotion cables may be warmer sounding, you may like them once you get a more resolving preamp.

One change at a time works best for me.
Too many changes at once can lead to mass confusion.
Lol... i remember that - you totally called that - the BAT for sure and I took note of your comment as I do with all you guys.

I appreciate and respect the feedback you guys give me.

I am so much more better informed as an Aphile because of this site and you guys.

Im getting there but I don’t regret the move either as I have with so many others because I’ve made and I had to do it and hear it for my meself / i had this idea of what a good, warm tube preamp would be and now know what it is in my system.

With my old Speakers the BAT would have been the perfect match so it’s always so system dependent.

I agree on the too many changes too quickly also but there are reasons on each of these which I’m fine with - i needed to try the tubepreamp and the cable change wasn’t anything I was looking to do it just happened organically.

I think i mentioned before on many components i let them come to me.

What I mean is the Kubala Emotion SC’s were what I really wanted and looked for weeks before I finally pulled the trigger on the Cardas Clear Reflections because that old HiDiamond match were so bright and brutal it had me not even want to listen to my system.

Since them I’ve also learned that break in had a lot to do with the brightness also so a more patient take by me would have helped but we are who we are as people and the best we can hope to do is learn and evolve from mistakes.

So needless to say I woke up in the am and came across a great deal on a used pair of Kubula-Sosna Emotion 2.5m Speaker Cables and I jumped.

I was looking all over for these and when they came up i needed to jump and make the move.

If not they would be gone so my buying used at my target of area of paying 40% to 45% of original MSRP sort of dictates the timeline on many of these decisions because they will be gone. I’ve leaned this the hard so many times. I wanted them. I’ve always thought good Speaker Cables are VERY important. The most important cable IMO. 

i actually heard the Emotion SC’s and IC’s at Goodwin’s Audio a few months back on Magico’s and loved them and had them as a target since then but just couldn’t find any used anywhere and way way too much money new! It’s not that I’m cheap (although if I sort of am :) ) it’s just i could never afford excellent cables at their totally nuts new cable pricing. Heck even the Used prices are nuts in the eyes of regular people in the rest of the world... 😂 

My wife was like how much does that strip of wire cost? I said they are not wires they are cables and she looks at me like I’m nuts 🥜 

When i heard them at Goodwins they were with Constalation gear which is super expensive but I feel in love the Kubala Cables so I hope i like them.

I liked the Cardas Clear Reflection SC and the change had more to do with what I described above.

He Reflections are basically Cardas Golden Reference with the cold forged spikes from the Clears.

The Golden Reference is a beloved Cable that many people still love but the Golden Reference was a very warm and rich euphoric Cable.

I was thinking and am still hoping the Emotions are in comparison the Reflections are a bit more neutral and transparent than the Cardas cables. I needed and still want to have that musicality. I think Magico work better with this type of cable but the change was hoping to move me a smidge back to the middle of the spectrum.

I value your opinion you were dead on with call on the BAT!

Do you really think they might be warmer than the Cardas? Man everyone speaks so highly of the emotions and if warmer than the Cardas that would make them really warm and just didn’t think a cable that rich and warm would be so highly thought of but would love for you to expand a bit. 

If this is the case maybe I go with a cooler IC???

I was thinking about trying to match and go with Kubala Sosna Emotion IC which i heard we’re great but the overly warm has me quite open minded. That kind of goes against my new 3 layer approach of Transparency, musicality and neutrality that is my goal in this order.

as always thank so much :)







I just started a thread asking about these 2-preamps but you guys have been with me on my system re-fit and wanted to see if any of you guys had feedback on these preamps:

Esoteric C03 preamp or Mark Levinson 326S preamp

ANY FEEDBACK - THOUGHTS - IDEAS would be so appreciated.