QSC for Home Theater continued... - Page 3

I felt the k8 would require a higher crossover point ~70-80 Hertz vs my preferred crossover point of 60 Hertz.

I'm not sure what I would do there. I don't like the coverage you are getting to be honest. You could go with just a single set of surrounds in the corners or put the rears in the corners and move the sides up a bit and angle them back.

I recall seeing Collo, an enthusiast from down under, .... utilize some diffusive treatment on his surrounds. He aimed them away from the seating and toward a scattering panel, thus eliciting a more diffuse, less direct effect. Perhaps, some variation of this is possible.

I do like what coctostan stated, move the sides forward somewhat, and th rears outward. Or perhaps best of all, ... strictly 5.1 and corner mount them.

All this is if there's a real issue. It'd be nice to implement what you can, as designed, and see what issues actually occur.

Or dipoles mounted under the soffits pointing down (this is what I have seen DE do in small rooms)

The more I look at this, I'd place the normal sides in the corners, and base the system as a 5.1 approach. And then experiment with 7.1 rears a little closer together than shown in the image. I think that may prove best upon another look.

Again, just conjecture ... but that's the approach I'd take.

Seemingly I only stumbled across this forum in the last couple of weeks, and I'm pleased to see so much QSC lovin' about.

While I don't have a surround set-up (well there's 20 year old Yamaha Pro Logic floating about somewhere) nor a Blu-ray player, I do appreciate a powerful sound system with plenty of extended fidelity.

I also so happen to have a pair of QSC K10 top boxes and a KW181 sub, and I wholeheartedly agree that the quality of the output of these things is extraordinary. While I originally purchased this rig for small front of house duties and foldback for my electronic drums and synth bits and pieces, I was startled at just how well these perform at moderate and low levels also for music playback in the home too. Just so effortless and projects so well from afar, whereas regular loudspeakers tend to lose their shine as one steps back (dome tweeters overtaken by room reflections, perhaps?).

BUT. there's one thing I just couldn't accept with these commercial sound-reinforcement speakers in a home theatre role... and that's the cooling fans in the back of each box.

How do you deal with that? In a dialogue-laden movie, away from all the high SPL effects and music, I think the background whir of the fans would drive me crazy! Thoughts on this?

Also curious peoples thoughts on boxes such as the QSC KW181 subwoofer....

Transducer: 18" cone transducer
Frequency Response (-6 dB): 38 Hz - 124 Hz
Frequency Range (-10 dB): 34 Hz - 143 Hz
Maximum SPL: 135 dB peak
Amplifiers Power Output: 1000 W Class D continuous (2000 W peak)
http://www.qscaudio.com/products/speakers/kw_series/series_specifications.php

So startling output where it counts in the 40-60Hz region, and will absolute shake the windows in a domestic setting, but rather lacklustre in the true sub-sonic 20-35Hz preferred zone of the die hard home theatre buff.

Again, thoughts?

I have to crank my kw's well above reference to even get the fans to come on, so normally there is no issue with fan noise for me.

^ ^ ^

Yeah, upon receiving my four K-8s, I promptly used them up front as LCRs for weeks, no issue with fan whatsoever,...never heard them a single time.

Non issue

Hmmm...

Perhaps the K series fans are calibrated differently from the KW series (though my KW181 fans seems to mirror the traits of the K10s)?

Perhaps the Chinese made boxes (for the Asian/Australian/Pacific markets) are calibrated differently from the USA-made boxes?

I know there's supposed to be a change of fan response/performance in recent models compared to the initial models (later models supposedly kick in less often and better varied in speed).

However, with all 3 of my QSC boxes (2 x K10s and 1 x KW118), the fans will kick in despite playing the quietest of quiet background music at the coldest times of the day. So is it a fault or feature? They each behave similarly?

I wonder what's up???

Audibly?

Shifts in ambient temperature?

Yes audibly, in the sense that it can be heard above music while playing at a low background level when sitting up close, and can be heard when there's nothing being played from a distance of, say, 3 metres / 10 foot, particularly when all three fans / speakers are spinning.

And fluctuations in ambient temperature will cause the fans to kick in. So the speakers could technically be off (in standby mode) with no signal being fed into it, and the fans may kick in automatically should the rear panel be warmed up by the sunlight against the window/blinds behind during the day.

However, we are approaching winter, and the fans will still kick in during the middle of the night with the music playing the quietest of levels.

So what's normal?

http://forum.qscaudio.com/forum/viewtopic.php?f=4&t=3707

According to QSC techs, 23 to 24 degrees Celsius is typical normal ambient temperatire for the fans to not be running, and understandably the fans may still kick in should the chassis warm up.

I've popped a thermometer in the room so will keep an eye on what the room's doing temperature-wise and run my experiences past the QSC forum team.

Oh yuck, those fans would be a deal breaker for me. You can try opening up the speaker and swap out fans for quieter ones. I did that on my QSC amps and worked like a charm.

Interesting for sure, as my K-8's fans never were an issue, ... not a single time were the fans audible.

Just popped on a YouTube clip of a snare drum demo for less than a minute at low volume, ended it, noted the fans had started up on the 2 x K10s, and notably noisy against the 10:45pm environmental background.

Grabbed my trusty digital SPL meter...

39.2 dBA @ approx 1 metre.

Then reached around the boxes to shut down their power (including the fans), spun them back again, resumed my near field listening position...

34.2 dBA @ approx 1 metre.

Oh, and the temperature in the room right now is...

18 degrees celsius.

Next step, QSC forums/tech-support for advice.

Did you get any good advice from QSC?

I just tried to register on the QSC forums and they indicated my IP is blacklisted. Can't wait to get out of Cambodia!

Nah, nothing yet.

But note my updated findings here...
http://forum.qscaudio.com/forum/viewtopic.php?f=4&t=3707

It would appear while all speakers will kicks their fans in with music, one speaker seems to be the culprit in kicking in unnecessarily while in standby mode below 20 degrees Celsius.

That on its own is probably what's drawn my focus to the fans in the first place.

Ha! Wonder if its a blanket ban across the country or just a single ISP has done a few naughty things in the past?? Worth an email to QSC, if they have public email address, I reckon.

I've banned all of China. I've never done any business from there, and 75% of attempted registrations by spambots come from there, so I've given the entire country the boot. That's unfortunate for the innocent, but my site security is more important to me. The same probably applies here. I also ban any ISP that tolerates spammers, and it's easy to check on that with this: http://www.stopforumspam.com/search

I checked out the info on the link and found it quite valuable. I will be getting K8's as surrounds and will have to make sure that they are all the type that has temp dependant fan usage.

I
Many different ISPs here have issues when trying ta access many US websites, I assume it is due to the widespread spamming coming from Asia.

I was wanting to register to ask about preference for the PL3 or RMX amplifier series for HT sub (looking for full power down to around 10 Hz. On spec sheet I believe both are rated at -3 dB at 5 Hz.