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New amp listening fatigue: Distortion or ??????

Hello All,

I recently acquired a used Denafrips Hestia/Hyperion amp/preamp combo for my second system. I traded a low power 300B amp for it. It’s class a/b with 80 w/c 8ohms and 150 w/c 4 ohms. I thought it would go nicely with my Denafrips Pontus2 and it does. My first listening session was about 1.5 hours long listening to Beethoven symphonies which I know quite well. My initial impressions were positive. The new amp produces a huge, well defined soundstage and effortless ability to project dynamics. Bass is strong and well defined. Treble is smooth and clean sounding. The mids are rich and accurate, but much more energized than the bass and treble. After an hour, my ears felt pressurized and were ringing and I couldn’t listen anymore. I usually listen around 75-80 dB max. I never heard any distortion or anything suspicious. I repeated the session next day with my other speakers with the same results. Is it possible that there may be distortion present that I can’t hear? Or maybe this amp highlights certain frequencies that irritate my ears?

In years past I discovered I have a sensitivity to certain frequencies in the midrange somewhere around 600 - 1000 Hz and I used to use a graphic EQ to lower the mids. I’ve also gotten rid of any speakers or amps that have that hump in the midrange. My current, everyday rig is a Hegel H95, using the internal DAC for music and video played through Philharmonic BMR Monitors. I never get tired listening to this set up and can listen for hours. The Hegel is clean and clear with a balanced, neutral presentation. The new amp/pre combo has a warmer, stronger more muscular sound and unfortunately, creates listening fatigue. I’m thinking of adding a Schiit Lokius EQ to tame the mids in the new amp. Thing is, I’m also trying to simplify my gear, gravitating towards smaller, lighter weight speakers and components. Maybe just get another Hegel for my second system?

BTW I always protect my hearing when using or loud equipment or around any other loud sound source. My hearing has dropped off over the years, but I still hear up to around 9,000Hz.

Has anyone had similar experiences with a new/different amp?

dtapo
drbay
42 posts
 

Denafrips use an automatic converter switch between 220 and 110. How are you so sure that they test a product at 110 volt, as much as they tested at 220 in China. Even if there were some differences in terms of sound and distortion will be identical at two different voltage. Do you think Denafrips will not sell a product in US market, because there is a bit more distortion at 110 volt?

I think trying a better power cable can make significant difference, I know it because it actually did for me.

ghdprentice
6,965 posts
 

OP… “It seems as if the sound is too intense, if that makes sense.”

That sounds like the bias in the amp is set too high. I got an amp on loan one time… it sounded terrible (high end audiophile amp of great repute) and it almost sounded like being in an auditorium when the gain on the PA system is turned up too loud… but no one is saying anything… it puts pressure on your ears. I returned the amp… the dealer sent it in… that was exactly the problem. Somehow in transport it changed.

 

cyanii
13 posts
 

Following this thread with interest as I sometimes experience similar situations.

i should add that I suffer from tinnitus, some days less so.

On days without tinnitus I can listen to music for hours, on other days not even 10 minutes.

Currently I think it’s my ears / mind that make the difference, not my system.

Another thought: room interactions? Maybe you need to reposition the speakers and or add room treatment now that your system is more revealing than before?

avanti1960
1,476 posts
 

Your speakers have ceramic midrange drivers and RAAL ribbon tweeters- extremely revealing and downright brutal with a neutral revealing amplifier.  I have only heard two speakers that use ceramic drivers sound good to my ears- Marten and Von Schweikert.   Nothing else including Revel sounded good- at all. 

You are also coming from the ultra refined world of 300b tube amps, no wonder you are shocked.  

I also suspect phase / crossover interaction between the midrange and tweeter. 

I can't comment on the sound of your amplifier but do agree that many hours of run in can help it to sound better- e.g. 200-300 hours.  

I do not recommend EQ because it can cause just as many issues as it fixes and is not benign to the sound quality. 

Some things you can try-

1) Speaker positioning- you want to increase bass and smoothness.  Be careful and deliberate moving the speakers in 1-foot increments as your room will allow. 

Move them wider, closer to the wall, then farther from the wall.  At each position experiment with toe angle- from aiming perpendicular to the wall to aiming at a spot a few feet in front of you. 

Also experiment with stand height.  Too high and you lose bass reinforcement and increase midrange / treble energy.  Try lower stands that bring the tweeters 2-3 inches below ear level.  

Finally try different interconnects and speaker cables- with resolving speakers like yours they matter greatly.  Avoid silver plated hybrid cables and use only OCC copper.  

Although it is not a synergistic match with some burn in, positioning adjustments and re-cabling you might be able to salvage your system. 

dtapo OP
73 posts
 

My Philharmonic BMR monitors are the older style with scanspeak paper cone drivers. I built them from a Meniscus Audio kit and used all high-end Clarity Caps in the tweeter and mid driver circuits, for a smoother sound. It's true they are the most revealing and transparent speakers I've ever had, and I really like the way they sound. The thing is, they are not fatiguing with my Hegel. All my cables and interconnects are Canare copper. I may consider going back to a push/pull tube amp to use with these speakers. The reason I traded my 300b set amp is because it really couldn't drive those speakers and I feel the low power is a real limitation in speaker selection.

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