[Rogue Audio Cronus Magnum with Chorus II produces persistent hum, anyone else had this issue?]

The Magnum upgrade on the cronus gets the KT 90 output tubes.... the standard EL-34's are only pushing 60 watts... I have the atlas magnum (same design) with KT 90's that is dead quiet through klipschorns.... depending on the preamp,need to put my ear up to the grillcloth to hear any hiss with the preamp cranked.... Right now I have a perseus (4 tube mu follower) in the main system and it is dead silent... My BBX II is almost as quiet also except for the high gain phono, but thats the nature of the beast.

got to be something wrong with unit... it happens even to the best.... I'd send it back, or talk to Rogue and see if there is a dealer in your area who can check it out for you?

Thanks for letting me know about your experience with the Atlas Magnum. I have to believe that if your Atlas is reasonably quiet paired with Khorns, the Cronus shouldn't be causing troubles with less sensitive Chorus IIs. - Matt

[Rogue Audio Cronus Magnum with Chorus II produces persistent hum, anyone else had this issue?]

I own several pieces of rogue equipment and they are very very high quality.... even your Cronus which is Rouge's "entry" int. has better guts, build quality, and engineering than some other supposed "high end" fancy scmancy manufacturers offerings...... That being said I had a problem with my rogue phono pre producing a "hum" not a ground loop or RF and sent it back.... bad part and they fixed it right up.... I'm afraid you may have to send it in for a fix. If they find that it was a bad part, try to get them to pay for shipping back to you at least.

one other thing it could be is RF interference..... have you tried turning off your WIFI? moving positions or in another room..... sometimes they can pick up RF and with the sensitive chorus it is amplified.... Just a thought....

Thanks for the reply. I'm leaning toward sending it in, even just for my own peace of mind. I'll always wonder otherwise.

I also suspected WIFI issues, but turning off routers, computers etc. has made no difference.

[Rogue Audio Cronus Magnum with Chorus II produces persistent hum, anyone else had this issue?]

Thanksfor the clarification Peter,

What you found is essentially what I've been told by Rogue, and I would trust that they know what they're talking about. The Cronus is manual bias, but at least at the recommended 35 mv I haven't been able to get the noise to go away.

Thanks again - Matt

[Rogue Audio Cronus Magnum with Chorus II produces persistent hum, anyone else had this issue?]

Is this amp new or did you purchase it used?

There is absolutely no reason a quality push pull tube amp should cause you anything more then noise that you have to be within about a foot from the speaker to hear. That noise should be nothing more then hiss or white noise, not hum. When you say the amp hums what exactly do you mean? Hum is similar to the lowest notes you could hum via your vocal cords. I ask this since in my expereince many people call all noise hum. Buzz and hiss can be caused by many different things while hum is an entirely different thing.

It sounds to me like you have ruled out all the ground loop and other causes of hum and since the amplifier has a volume control turning it to zero is pretty much shorting the input to ground.

Rogue is not know to build low quality stuff so I suspect something is wrong with the amplifier.

So describe this noise a bit more.

After additional listening, I'd like to add a few observations:

- The noise is two-part, there's a high hiss (ssssss) accompanied by a low hum (mmmmmm) coming from both the tweeter and squawker. The squawker is by far the louder of the two.

- These loudspeakers have the Crites titanium tweeter diaphragms (not sure if this might make a difference or not)

- There looks to have been some soldering done to the leads to both tweeters. Each of the clamps has another wire soldered on to it, and the additional wires have been cut. I've never looked inside before, is this normal or a sign of something funny? I've attached a picture to show what I found.

Thanks

[Rogue Audio Cronus Magnum with Chorus II produces persistent hum, anyone else had this issue?]

Is this amp new or did you purchase it used?

There is absolutely no reason a quality push pull tube amp should cause you anything more then noise that you have to be within about a foot from the speaker to hear. That noise should be nothing more then hiss or white noise, not hum. When you say the amp hums what exactly do you mean? Hum is similar to the lowest notes you could hum via your vocal cords. I ask this since in my expereince many people call all noise hum. Buzz and hiss can be caused by many different things while hum is an entirely different thing.

It sounds to me like you have ruled out all the ground loop and other causes of hum and since the amplifier has a volume control turning it to zero is pretty much shorting the input to ground.

Rogue is not know to build low quality stuff so I suspect something is wrong with the amplifier.

So describe this noise a bit more.

Thanks for the reply.

The amp was purchased brand new and I've had it for less than a month.

The noise is more of a hiss from the tweeter (higher sssss noise), while the woofer makes more of a hum (low mmmm noise). For context, I have an old pair of Bose 301s that I've tried with the amp, and they produce a low volume hiss that is inaudible at more than a foot or so.

Any help is greatly appeciated - thanks!

[Rogue Audio Cronus Magnum with Chorus II produces persistent hum, anyone else had this issue?]

isadorfarm,

Rogue along with other tube equipment can hum with Klipsch. I had a Rogue Eighty-Eight that I loved on lower efficiency speakers but when I put the amp on my k-horns, serious hum. Tried shorting the inputs, everything, nothing worked short of sending it back to Rogue for a going through. I did discuss it with Mark and he thought that likely only the Rogue higer end amps would have lower hum on such an efficient speaker. I eventually sold the amp (though really good if on 93db efficient speakers).

Thanks for the reply. Just to be clear, did sending the amp back have any appreciable effect on the hum? Would you advise me to have Rogue look it over, or is your opinion that the "budget" Rogue amps simply produce a hum through high efficiency speakers? Not something I thought of when buying the amp....

[Rogue Audio Cronus Magnum with Chorus II produces persistent hum, anyone else had this issue?]

Welcome Matt.

The hum (ground loop) police will be here soon I suspect. As a past owner of Chorus IIs and current owner of Belles and tubes, my limited experience is that sensitive Klipsch "noise" is a hiss not a hum. Ground loop? Tube?

Walk us thru this. With speakers connected to amp and only the amp powered does it hum?

Brand/model of amp?

Changed power strips? Power strips (of any kind)...hummm, may be an issue

To be clear, the noise from the tweeter is more of a hiss (sssss sound), while the woofer makes more of a hum (mmmmm sound) and the squawker is somewhere in between.

[Rogue Audio Cronus Magnum with Chorus II produces persistent hum, anyone else had this issue?]

Should re-title the name of this thread to "Rogue Audio Cronus Magnum with persistent hum" ..it isn't the speakers.

Chorus II don't talk without an amp prodding them to do so.

Good suggestion, done

[Rogue Audio Cronus Magnum with Chorus II produces persistent hum, anyone else had this issue?]

Does the amp have AC filaments? Try shorting the input of the amp, not just disconnecting it to make sure it is from the amp.

Thanks for the advice. Could you be more specific about the filaments? I'm not familiar with what they are, or if I have therm. Thanks

[Rogue Audio Cronus Magnum with Chorus II produces persistent hum, anyone else had this issue?]

Thanks for the reply USNRET.

The hum is there with no inputs connected, at zero volume as well. With or without power strip, using an isolated ground or common receptical.

The amp is a Rogue Audio Cronus Magnum. So far they have been nothing but helpful in terms of support, I can't say enough nice things about Mark OBrien and his team there.

I'm just holding out hope that there's a fix without sending the unit back in...or worse that its an issue with the speakers and amp pairing.

[Rogue Audio Cronus Magnum with Chorus II produces persistent hum, anyone else had this issue?]

Hello All,

I've recently paired a new (to me) pair of Chorus IIs to my brand new 90 wpc tube amp. I love the sound, but have been getting a relatively loud hum without any imput. It's audible at 8-10 feet, not super loud, but still there. It's especially bothersome during quiet passages in classical music.

I've run through the usual drills, disconnected all inputs, plugged them back in separately, changed outlets, changed power strips, removed the ground with a cheater plug etc. All to no avail.

I've contacted the manufacturer, who was kind enough to send a new (and they thought) much quieter preamp tube to fix the problem. No dice, it's still there. In communicating with the manufacturer, they seem to think it might simply be that the Chorus IIs are too sensitive (101 dB, I see). Is that reasonable? Has anyone else had a similar issue with high sensitivity Klipsch speakers?

I'm contemplating sending it back for them to check out, but at 55# it's going to cost some money to get it there and back.

Thanks for any insight - Matt

[Help requested in placing Chorus II]

Here's a picure of the new layout. It's impossible to get a good photo with the sun and snow outdoors...

[Help requested in placing Chorus II]

Thanks for the advice on placement. I took a minute to plot Colter's Rule against another commonly occuring function, with unfortunate results.....

[Help requested in placing Chorus II]

Thanks for the tips, I've been playing with the placement today and am glad to have a place to start.

gpbusa: I'm glad to see you've also been baptized by Brother Bill Hicks....the man spoke the truth.

[Help requested in placing Chorus II]

Hello,

I just returned from a sizable roadtrip to purchase my first set of Klipsch loudspeakers - a very nice pair of Chorus IIs.

Does anyone have any pointers in properly placing these in a room? Any advice regarding whether they should be close to the wall, far from the wall, in the corners, toed in, etc. would be greatly appreciated.

Thanks in advance, I love this forum. Matt

[Good match for Rogue Audio Cronus Magnum, Advice Needed]

Hello everyone,

I've been lurking here for a while, trying to glean info about an upcoming purchase. I recently pulled the trigger on my dream amp - a Rogue Audio Cronus integrated tube amp with the Magnum upgrade (90 WPC). I expect to take delivery any day now and consequently my thoughts are turning to upgrading my old speakers as well.

Does anyone have any experience with these amps and Klipsch loudspeakers?

My space is pretty unique. It's essentially a barn with an open floorplan. 26' x 40' with an open loft space in the rear, 10' side walls with a 25' roof peak, open ceiling with exposed beams throughout. Currently I'm using a Marantz 2220 with a pair of Bose 301s, holdovers from a much smaller living room. Surprisingly, this setup sounds pretty OK in the barn-sized room. I mostly listen to jazz and psych-rock on LP.

I welcome any advice about which speakers would best suit this setup. My price range is sub-$700, I've mostly been looking at used Forte/Chorus/Cornwall sets so far, but I'm really very open to suggestions. I'd love to be able to audition things, but I'm located in N. Michigan (happily) a long way from anywhere and thus will have to most likely buy before I listen.

Thanks for looking - Matt Visser