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Post by djoel on Nov 5, 2011 13:08:30 GMT -5
Sold it for a $900 profit.  Strangely enough I believe we might have received the same deal, newegg? I sold mine for around the same price, to a French man  Dan |
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Erwin.BE
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It's the room, stupid!
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Post by Erwin.BE on Nov 6, 2011 6:57:59 GMT -5
Erwin, the Yamaha RX-Z11 (eleven powered channel amps) has a single 1 kVA (1,000VA) EI core transformer. * It sounded excellent for the short time that I had it. Thanks for the info, Bob. I know it outweighs about 2x the normal receiver and I remember reading reviews that it's one of the best sounding AVR's out there. Anyone has an idea how large the power supply in the Denon 4311 is? I bet it's somewhere between 600 and 750 kVA. You could use it's internal amps for the surrounds, but then it wouldn't be in the prefered pre-amp mode. |
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sorbe
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Post by sorbe on Nov 8, 2011 2:27:10 GMT -5
I found a solid reason not to continue driving my Magnepan 1.7s (4 ohm loads) using UPA-1 monoblocks (See this post/thread on the UPA1 and THD+N @4 ohms)XPA-1: THD+N 0.004995% with 4ohm loadXPA-2: THD+N 0.118162% with 4ohm loadXPA-3: THD+N 0.035883% with 4ohm loadXPA-5: THD+N 0.087705% with 4ohm loadUPA-1: THD+N 0.279648% with 4ohm loadUPA-7: THD+N ~0.2% to ~0.02% with 4ohm load (any suggestions on normalizing this range to make it apples v. apples) Seems to me that XPA-1 is vastly superior on total harmonic distortion(THD+N) driving difficult 4 ohm speakers. Not to mention the the Maggies 1.7s are also low-sensitivity(Sensitivity 86dB/500Hz /2.83v) meaning more power hungry than many speakers for the same volume levels. Does anyone find it odd that the XPA3 seems significantly better on the THD+N rating with 4 ohm loads than the XPA2. Is that perhaps because the XPA3 was a later design? Or is it harder to get good stats on a larger power AMP like the XPA2? I doesn't seem like that's a given since the XPA-1 does such a great job at 4 Ohms. Also, now I'm wondering about how well the Denon 4311ci is REALLY doing on THD driving my surrounds at 4 ohms as well. Denon claims to drive low resistance loads well BUT conveniently leaves out any specs driving 4 ohms and I cant find any third party testing info (yet). Denon 4311ci 140W @8 Ohms: 20Hz-20KHz 0.05% THD Denon 4311ci 170W @6 Ohms: 1KHz 0.7% THD I have to assume that 4 Ohms loads are much worse than that. If that's true, it really calls into question whether the 4311ci (or any AVR) can really do a good job on 4 Ohm loads. Erwin.BE: Thus it seems you're right about using the 4311ci as a preamp for with external power amps(like Emotiva) being "preferred" for a very good reason, especially on 4 Ohm speakers like Magnepans. |
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sorbe
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Post by sorbe on Nov 8, 2011 13:21:17 GMT -5
Much as I like Emotiva products, particularly the power amps, have you noticed that Outlaws (self published) power amp specs at 4 Ohms seem quite a bit better, for their low end products? Outlaw Audio Model 7125 7-Channel Power Amplifier: Power Output: 7 x 125 watts RMS at 8 ohms, all channels driven from 20 Hz to 20kHz with less than 0.05% THD 7 x 190 watts RMS at 4 ohms, all channels driven from 20 Hz to 20kHz with less than 0.05% THD Outlaw Audio Model 7075 7-Channel Power Amplifier: Power Output: 7 x 75 watts RMS at 8 ohms, all channels driven from 20 Hz to 20kHz with less than 0.08% THD 7 x 115 watts RMS at 4 ohms, all channels driven from 20 Hz to 20kHz with less than 0.08% THD Outlaw Audio Model 2200 Monoblock Power Amplifier: Power Output: 200 watts @ 8 ohms, 20 Hz - 20 kHz, <0.05% THD; 300 watts @ 4 ohms, 20 Hz - 20 kHz, <0.05% THD Is there any third party testing that supports this? Do you really think Outlaw Audio has better power amps ratings than the UPA line at 4 Ohms? |
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Post by ausman on Nov 8, 2011 15:30:16 GMT -5
the rxz-11 only supported supported 50 watts per channel for front heights and frnt wides, to be honest I really doubt you would be able to hears the heights and wides over the mainb 7 channels..
also note the rxz-11 has a weird amp 3/2/2/4..
the best I could see for a 9 channel or 11 channel setup is: 3 xpa-3's (9 channel) or 1x xpa-5 and 2x xpa-3's..
or 5-6 xpa/upa/xpr-2's or 9-11 xpa-xpa/xpr-1's...
as for processor/pre-amp there is limited options so far for 11 channel though for 9 channel you have the avp/5507/09,av 7005/8003, not sure how many avr's actually support a complete set of 11 channel pre-amps so can run a complete 11 channel via power amps..
neither d&m holdings, onkyo or Yamaha, pioneer & emo have sought to release a processor/pre-amp for 11 channels, with exception emo the remaining co's all have avr's within the marketplace supporting 11 channels..
while the avr's support 11 channels don'r expect the to support 11 amps as most only support 3-5 at most for 11 channels..
also note: avr amp values are only with 2 channels driven not 7 channels or 11 channels driven
i would have to say when comparing 7 upa-7 to an amp section of any avr, the higher value on the avr relates to 2 channels driven n9ot 7 channels driven ..
i'd also be more inclined to use a 4ohm rating appose to a 8 ohm rating anyway..
upa-7 designed to deliver 125-185 watts by 7, going with the upa-1 200-350 watts as it uses the same amp components like the xpa-3/5..
comparing out to emo can be done as they havesimilar output ratings..
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sorbe
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Post by sorbe on Nov 13, 2011 3:17:15 GMT -5
Since I couldn't find a UPA-7 to add to an XPA-5 for 11.2 channels, and they will likely never make an XPA-7 (or possibly even an XPR-7), I broke down and bought an whole new 29U rack and 4 separates.
Mains: XPA-1 (2)
Surrounds: XPA-5 (2)
I guess their strategy of not selling 7 channel amps is working. :/
GREAT prices on the Holiday Sale tho!
=tkb
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Erwin.BE
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Post by Erwin.BE on Nov 13, 2011 8:21:02 GMT -5
Since I couldn't find a UPA-7 to add to an XPA-5 for 11.2 channels, and they will likely never make an XPA-7 (or possibly even an XPR-7), I broke down and bought an whole new 29U rack and 4 separates. Mains: XPA-1 (2) Surrounds: XPA-5 (2) I guess their strategy of not selling 7 channel amps is working. :/ GREAT prices on the Holiday Sale tho! =tkb ;D Hey, and you will be ready to amp the rear height center channel.... |
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sorbe
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Post by sorbe on Nov 14, 2011 6:53:33 GMT -5
;D Hey, and you will be ready to amp the rear height center channel.... Grin. Clearly, I'm not thinking big enough. Maybe it IS time for that "center surround"... LOL.  (LOL... what genius thought up this oxymoron of a channel name anyway) |
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Erwin.BE
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It's the room, stupid!
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Post by Erwin.BE on Nov 14, 2011 9:18:03 GMT -5
^^
Or else: use a 12th tower speaker for doorbel duties...
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Post by sharkman on Dec 5, 2011 12:38:09 GMT -5
I know it's "nearly" pointless given Big Dan's comments about 7 channel amps not selling well, but I believe it's all about whether there is enough wattage (200@8,300@4) and balanced inputs. The XPA-7 was never an option because of technical issues. I believe that was one of the reasons to develop the XPR-7, which was later axed because the UPA-7 didn't sell well. A reasoning I simply have difficulty with to grasp... Yeah, I don't follow the decision by Emo to abandon 7 channel altogether. They said 7 channel amps just don't sell, so why then are they selling 2 7 channel models under the Sherbourn name? Different marketplace? |
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Post by House on Dec 5, 2011 12:52:19 GMT -5
who knows but im sure their sales numbers directly show them that the market for them just were not as expected....
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bootman
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Post by bootman on Dec 6, 2011 10:09:35 GMT -5
The XPA-7 was never an option because of technical issues. I believe that was one of the reasons to develop the XPR-7, which was later axed because the UPA-7 didn't sell well. A reasoning I simply have difficulty with to grasp... Yeah, I don't follow the decision by Emo to abandon 7 channel altogether. They said 7 channel amps just don't sell, so why then are they selling 2 7 channel models under the Sherbourn name? Different marketplace? Yes. ...and <cough> profit margins <cough> Here is what all of you are missing: www.audioholics.com/reviews/amplifiers/sherbourn-pa-7-350-seven-channel-amplifier-preview Price: $3999 |
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Post by sharkman on Dec 6, 2011 16:42:35 GMT -5
Yeah, I suspect that there might be a market for 7 channel amps, but in Emotiva's XPA line there might be a challenge for a 15 A circuit if they build an XPA-7. That Sherbourn looks amazing!
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Post by House on Dec 6, 2011 16:47:49 GMT -5
yeah if only it wasnt so ugly on the outside!
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Post by ausman on Dec 7, 2011 0:18:47 GMT -5
ah that reminds me of a the old sony model a couple japanese standing cinemas had in working to demonstrate a 14-21 channels as a possibility in a cinema environment...
audioholics are behind the 8-ball even commenting on an amp that is all but a prototype.
with them rear center channel in the diagram I would say while they show a large speaker layout it also indicates a neo6 setup with a rear center channel...
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Post by sharkman on Dec 8, 2011 11:07:59 GMT -5
Yes. ...and <cough> profit margins <cough> Do you think that is the reason the XPR-7 never made it into production, that when Emo took over Sherbourn they saw an opportunity for better profits? I think that new amp will give some prestige to Sherbourn, and since many other manufacturers have big 7 channel amps, this would give that marketplace a jolt. How it sells, however, is another question. |
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Post by sharkman on Dec 8, 2011 19:00:07 GMT -5
Although it should sell well with all of the interest the design generated on this forum.
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Post by coldfusion on Jan 25, 2012 20:22:08 GMT -5
I want a real 7 channel emo amp (read 200wpc). The recent 7 channel amps have only been 125. 125 watts are for wusses.
7 ch. 200wpc. $1100-1200.
Until then, I'll be hunting a used mps-2...
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Post by ausman on Jan 25, 2012 22:35:32 GMT -5
imo I think emo shelved 7 channels due to not having enough parts in stock for repairs, I suspect this is why both the sherbourn and emo 7 channel amps were put in moth balls for the time being...
give it time 7 can will be back
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Post by dragonV on Jan 26, 2012 5:20:35 GMT -5
I want a real 7 channel emo amp (read 200wpc). The recent 7 channel amps have only been 125. 125 watts are for wusses. 7 ch. 200wpc. $1100-1200. Until then, I'll be hunting a used mps-2... Agreed. Think the 7 x 200w mark would be ideal!!! Hopefully we do see another emotiva 7 channel amp before too long. |
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