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What's causing the highs to be rolled-off?

I finally achieved the fullness, detail, and bass-weight I want from my system.

My system:

Blue Circle BMPH integrated-solid state /Audience PC (to FIM outlet)
Modwright Sony 999ES /VH Audio Flavor 4 PC/ Furutechs
Raytheon tubes
Acoustic Zen Matrix Ref II (single end)
PS 9.0(power supply for Modwright/ tube rectified)
Black Sand Violet V1 PC
Raysonic CD 128 (VH Audio Flavor 4)Wattgates
EH 6922 tubes
Acoustic Zen Matrix Ref II (single end) and Blue Jeans XLR
PS Audio Premier /PS Audio Statement SC PC
Reimer Wind River GS speakers
Acoustic Zen Satori cables
HSU vtf 2 mk2 sub / FIM outlet/ PS Audio Ultimate Outlet
Earthquake Supernova Mk IV sub

Both my sources are connected to the Premier. BMPH to the wall. The problem is the highs are rolled off. What do you think is causing this? A few days ago I cleaned the Audience PC connected to the BMPH with deoxit- I wiped it off but did not use anything like alcohol to clean off the deoxit. Could that be causing roll off in the highs? Or could it be the PS Audio Statement SC power cord which just finished break-in after 2 weeks of playing. I'm considering trying a DCCA cord on the Premier in place of the Statement SC.

Thanks for your feedback.
foster_9
foster_9 OP
1,610 posts
 
What element was added just prior to the highs being rolled off?
Tvad (Threads | Answers)


I was using a 6 ft Audience pc on the BMPH integrated that was about 2 months old, which I sold -it replaced an older 5ft. Audience pc. Put back the older 5ft. Audience pc on the integrated. The highs were good prior to that change. At the time, the PS Audio Statement SC pc was ending a 2 week break in period. The stock cord on the Premier was replaced with the PS Audio Statement SC pc 2 weeks earlier. I wanted to improve the highs as they were somewhat rolled off using the stock pc on the Premier. The highs improved after I added the newer Audience cord to the integrated- but, then too, the Statement SC power cord was breaking in at the same time. At the time, I was not sure whether it was ultimately the newer Audience power cord on the integrated or the Statement SC power cord on the Premier that was responsible for the improvement in the highs. But now, that the older Audience pc is on the integrated and the Statement SC pc is broken in, the highs are rolled off again. Hope I explained this sequence well enough.
jaybo
4,478 posts
 
A/B your amp with another. the gs speakers should be extented in regard to the treble.
tvad
9,467 posts
 
I'd try plugging each component, one-by-one, directly into the wall. Start with the amp. If things don't improve, then plug the amp back into the conditioner's "Amp" duplex and plug your source directly into the wall.

See if one combination improves the highs.

I once demoe'd a BPT balanced transformer, and I found the highs were rolled off. One outlet in particular on the BPT would roll off the highs more than the others.
newbee
4,093 posts
 
Funny thing just happened to me. I just recapped some old mono amps and was using them in a secondary system to break in the caps. The funny thing was that the mids sounded fine but the top end was a bit rolled and mid/low bass was AWOL. I did some trouble shooting as this made no sense to me. I found my problem in the pre-amp. The tubes were old and I just hadn't paid any attention before. Put in some new driver tubes and the bass was back!

FWIW.
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mrtennis
3,295 posts
 
it is possible that the highs may not be rolled off. if you are accustomed to a bit of sparkle in the treble and have lost it because you recently replaced some components, you may now have a more balanced frequency response.

most stereo systems are bright. you are fortunate.
why not live with it for a while. after you get used to it, you may prefer its presentation.

you can always add a one meter silver cable between your raysonic and the inegrated amp.
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