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Krell Foundation Owners Thread - Page 44

post #1291 of 1298
I have researched the Foundation and followed the posts with interest. I found a comparative table by a German supplier. The credentials of the reviewer is open to debate but non the less makes for intersting reading. http://www.takeoffmedia.de/journalismus/bestenlisten/av-vorstufen.html

The Foundation scored a total of 72, equal to the Bryston SP3 although each scored differently in each sub class. For the interested, google translated the scores from left to right of the table as follows. Total score: tonality: resolution: bass: dynamics: surround: stereo

Bryston SP3- 72: 9: 14:13:11:11:14
Krell Foundation- 72:10:13:11:12:12:14
For interest the Marantz AV8801 was not in the same class scoring- 61:9:11:11:9:10:11
post #1292 of 1298
Quote:
Originally Posted by Kal Rubinson View Post

I agree it is pretty bad and that is why I chose it.  It is the front left speaker which was sitting in a corner within a meter of the front and side wall.  Unlike the other speaker positions, it suffers from a large peak at around 42Hz and a deep suck-out at 65Hz in the raw FR for any speaker placed in that position.  (I say suck-out and not null because it is correctable.)  The ARES EQ severely boosted the bass from the top of the 42Hz peak and extended it all the way down.  It also widened the 65Hz trough and didn't deal with the anomalies from 100-250Hz.  

The real point of the figure, however, is to show that moving the top of the EQ range from 250Hz to full range just sucked the life out of the treble.  This suck-out was apparent on all the speakers, not just this ornery one. 

I also agree that the Achille's Heel of autoEQ is that lack of verification and that any serious user should have an independent measurement system.  The published graph was derived from Omnimic V2 measurements.

Hi Kal,

I received my May issue of Stereophile yesterday. Thanks again for the great review.
I'm not a technical person, but I'd like to ask you a question regarding the ARES and EQ process.

Is it possible for a professional installer (i.e. Accucalhd) to adjust/correct the ARES/EQ manually with no limitations? The review says it is possible with the new firmware upgrade, but is there any limitations to ARES manual adjustment as far as you can tell?

Thank you
Edited by sharok - 4/20/14 at 9:30pm
post #1293 of 1298
Quote:
Originally Posted by sharok View Post


Hi Kal,

I received my May issue of Stereophile yesterday. Thanks again for the great review.
I'm not a technical person, but I'd like to ask you a question regarding the ARES and EQ process.

Is it possible for a professional installer (i.e. Accucalhd) to adjust/correct the ARES/EQ manually with no limitations? The review says it is possible with the new firmware upgrade, but is there any limitations to ARES manual adjustment as far as you can tell?

Thank you

Thanks.  I am afraid that I cannot answer your question as I spent very little time on the manual EQ and I no longer have the Foundation in my possession.  Also, the superficial manual doesn't seem to mention this at all.  Unless a user jumps in with this info, I think your best bet is to ask Krell specifically what the range/resolution is for the frequency, gain and Q of the manual EQ settings.

post #1294 of 1298
In the graphs that were run by you, Kal, it appeas that little was done to address the LF area assuming that the raw response of the 'room' is similar. If so, might this be attributable to the supplied microphone? Also, since you've had different products with RC before, how have they fared with this type of a test?
post #1295 of 1298
According to an older Cirrus publication, http://www.cirrus.com/en/pubs/proBulletin/IRC_PB.pdf, their room correction utilizes a 7 band parametric equalizer. Judging by the graphs posted at the end, the lowest frequency is centered around 160Hz, give or take. Not much more than that.
Edited by Chu Gai - Yesterday at 1:20 pm
post #1296 of 1298
Quote:
Originally Posted by Chu Gai View Post

In the graphs that were run by you, Kal, it appeas that little was done to address the LF area assuming that the raw response of the 'room' is similar. If so, might this be attributable to the supplied microphone? Also, since you've had different products with RC before, how have they fared with this type of a test?

The results FR was similar but the original 42Hz peak was exactly that with steep roll-off below while the EQ extended the LF boost from the peak at 42Hz to even higher values down to the measurement limit.  No other RC product has done this although there have been other anomalies in the past.  The junky microphone could be the source of the problem since I could not get it to recognize the subs unless I taped it to a sturdy stand.  Its flimsiness still could account for a lack of LF sensitivity and cause ARES to boost the bass.  

post #1297 of 1298

New Foundation owner here. Had it for about three weeks and it is setup and operating. It came with software version 1.18. On three occasions when watching TV with an HDMI connection from a DirecTV HD receiver, the Foundation would shut down and turn off the amp. It would then immediately power back up and tell the amp to power up too. Within a few seconds everything was back to normal. I thought it might be cheap surge protectors so I replaced them with some good quality Tripp Lite units. Everything was OK for a few days. Yesterday I loaded software version 1.19 via a network connection and that worked OK. Now a few minutes ago it shut down then immediately powered up again. The problem is still there. The other HDMI connection to the Foundation is from an Oppo 103, but I have not yet experienced this problem while playing any disk on the Oppo. Any ideas?

post #1298 of 1298
Quote:
Originally Posted by Chu Gai View Post

According to an older Cirrus publication, http://www.cirrus.com/en/pubs/proBulletin/IRC_PB.pdf, their room correction utilizes a 7 band parametric equalizer. Judging by the graphs posted at the end, the lowest frequency is centered around 160Hz, give or take. Not much more than that.

I think those filters were crude examples as other prepros with Cirrus' EQ have filters at lower frequencies.  

See:  http://www.stereophile.com/content/music-round-53-rotel-rsp-1572-10-parametric-filters

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