Denon 1909 or Onkyo 875?
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I would think that the Onkyo 875 is definitely a significant step up from the 1909, especially as it retailed at around £1000 until very recently and considering the power it is capable of outputting, which is twice that of the 1909. The Denon seems much closer in spec and ability to the Onkyo 606. I'd definitely go for the 875 if you can stretch to it.
Yeah I was thinking the same and its only a few hundred more now. Its not too powerful for the b&w 685's is it?
I've read a few horror stories about the 875 getting very hot, smoking and sparks coming from it. It then stops working. Is this a well known issue? Can it be prevented if left in good ventilation?
Of course it can be prevented with good ventilation. I'd keep it away from the radiators too. I would think that those who have suffered problems probably weren't taking the proper precautions.
hughesyboy:I've read a few horror stories about the 875 getting very hot, smoking and sparks coming from it. It then stops working. Is this a well known issue? Can it be prevented if left in good ventilation?
Can run hot if the ventilation instructions in the manual are ignored - about 40C one magazine reported with horror, conveniently ignoring the fact that was only a few degrees above body temperature.
But smoking and sparks? New one on me...
Can run hot if the ventilation instructions in the manual are ignored - about 40C one magazine reported with horror, conveniently ignoring the fact that was only a few degrees above body temperature.
But smoking and sparks? New one on me...
Sliced Bread
Well-known member
Andrew Everard:
hughesyboy:I've read a few horror stories about the 875 getting very hot, smoking and sparks coming from it. It then stops working. Is this a well known issue? Can it be prevented if left in good ventilation?
Can run hot if the ventilation instructions in the manual are ignored - about 40C one magazine reported with horror, conveniently ignoring the fact that was only a few degrees above body temperature.
But smoking and sparks? New one on me...
I've heard reports of this too from other Forums...but personally I think it's a myth (aka BS). If the amps were really catching on fire as some reports have stated then surely there would be a recall.
hughesyboy:I've read a few horror stories about the 875 getting very hot, smoking and sparks coming from it. It then stops working. Is this a well known issue? Can it be prevented if left in good ventilation?
Can run hot if the ventilation instructions in the manual are ignored - about 40C one magazine reported with horror, conveniently ignoring the fact that was only a few degrees above body temperature.
But smoking and sparks? New one on me...
I've heard reports of this too from other Forums...but personally I think it's a myth (aka BS). If the amps were really catching on fire as some reports have stated then surely there would be a recall.
Andrew Everard:
hughesyboy:I've read a few horror stories about the 875 getting very hot. It then stops working. Can it be prevented if left in good ventilation?
Can run hot if the ventilation instructions in the manual are ignored - about 40C one magazine reported with horror,
The 875 runs extremely hot, too hot to touch, even if completely open and ventilated. Mine sits on top of a table, (when it's not in a box going back to Onkyo). It has stopped working twice since April 2008 and been back to Onkyo for repair. It is currently with Onkyo for repair.
I would not recommend the 875 to anyone, unless you fancy the girl who works in the Onkyo service department!!!
hughesyboy:I've read a few horror stories about the 875 getting very hot. It then stops working. Can it be prevented if left in good ventilation?
Can run hot if the ventilation instructions in the manual are ignored - about 40C one magazine reported with horror,
The 875 runs extremely hot, too hot to touch, even if completely open and ventilated. Mine sits on top of a table, (when it's not in a box going back to Onkyo). It has stopped working twice since April 2008 and been back to Onkyo for repair. It is currently with Onkyo for repair.
I would not recommend the 875 to anyone, unless you fancy the girl who works in the Onkyo service department!!!
Withou wishing to sound rude, do you have a Onkyo 875? The 875 generates an enourmous amount of heat, even when running at 1/3 volume. When running near to max volume you would think the unit was about to spontaniously combust. If run on max volume the unit DOES melt down. Mine has died twice since April 2008. The 875 is a piece of $%£* and does no credit to Onkyo. I am in negotiations with them to swap the 875 for a 905. Personally I would prefer a refund and to buy another make of amp but I am stuck with Onkyo...My advice, based on owning the product, steer clear of Onkyo...
orangeburger:NO, this unit is fatally flawed, see my other posts regarding 875. Do not buy this Onkyo.
In fairness after reading your other posts you do abuse your amp! they are not intended to run at maximum volume!
In fairness after reading your other posts you do abuse your amp! they are not intended to run at maximum volume!
My Onkyo 605 barely even gets warm - I run it at 52 for DVD and 60-62 for tv in a 4m square room.
Therefore, I have to agree with the previous poster, it sounds as though you're pushing it way too hard.
Its like a car, it might do a top speed of 120mph, but they're not made to be run that way all the time. Run it at or near top speed all the time and it soon gets hot and starts to wear out / break down.
To bring the music analogy back in, its like trying to run a disco with a home audio amp.
If you need the Onkyo insanely high on the volume scale, then what you probably need is a more powerful amp in the 1st place so you're running it more gentley at a lower percentage of maximum volume. If you can't get that it an integrated amp, then your probably looking at seperates.
That said, Onkyo's do run warmer than other amps and Onkyo should do something to address it either by a redesign or by fitting some active cooling as heat is the enemy of longetivity with electronics. There are some PC fans that are so quiet (26db) they can be barely heard in an otherwise quiet room. Something like that could easily and cheaply be fitted to the Onkyo in my opinion to help them run cooler and thus help keep customers minds at rest whilst extending product life.
Therefore, I have to agree with the previous poster, it sounds as though you're pushing it way too hard.
Its like a car, it might do a top speed of 120mph, but they're not made to be run that way all the time. Run it at or near top speed all the time and it soon gets hot and starts to wear out / break down.
To bring the music analogy back in, its like trying to run a disco with a home audio amp.
If you need the Onkyo insanely high on the volume scale, then what you probably need is a more powerful amp in the 1st place so you're running it more gentley at a lower percentage of maximum volume. If you can't get that it an integrated amp, then your probably looking at seperates.
That said, Onkyo's do run warmer than other amps and Onkyo should do something to address it either by a redesign or by fitting some active cooling as heat is the enemy of longetivity with electronics. There are some PC fans that are so quiet (26db) they can be barely heard in an otherwise quiet room. Something like that could easily and cheaply be fitted to the Onkyo in my opinion to help them run cooler and thus help keep customers minds at rest whilst extending product life.
Max Volume!!!!!!
I have a 5x4 mtrs room and running at 80% not only does the sound hurt ones ears but the bass is shaking the room, furniture and windows!
I do allow the sub to do much of the hard work of the bass, which loads the 875 and speakers less. It runs less stressed and cooler resulting in improved clarity and detail.
The TX-SR875 and TX-NR905 are a dual push-pull amplifier configuration, (this layout generates heat). Coupled with a three-stage inverted Darlington circuit and Burr-Brown DACs for outstanding efficiency and high current with very low distortion.
Giving that they come with a 3yr guarantee I do not see a reliability issue here.
I have a 5x4 mtrs room and running at 80% not only does the sound hurt ones ears but the bass is shaking the room, furniture and windows!
I do allow the sub to do much of the hard work of the bass, which loads the 875 and speakers less. It runs less stressed and cooler resulting in improved clarity and detail.
The TX-SR875 and TX-NR905 are a dual push-pull amplifier configuration, (this layout generates heat). Coupled with a three-stage inverted Darlington circuit and Burr-Brown DACs for outstanding efficiency and high current with very low distortion.
Giving that they come with a 3yr guarantee I do not see a reliability issue here.
professorhat
Well-known member
hughesyboy:Yeah I was thinking the same and its only a few hundred more now. Its not too powerful for the b&w 685's is it?
Nope, I use a 905 with the 685s, no issues.
As for the ridiculous stories of it running so hot it burns your hand, these are just not true. Mr orangeburger seems to have been offended by Onkyo in some way so is spreading untrue rumours about them for some reason.
Nope, I use a 905 with the 685s, no issues.
As for the ridiculous stories of it running so hot it burns your hand, these are just not true. Mr orangeburger seems to have been offended by Onkyo in some way so is spreading untrue rumours about them for some reason.
I bought my first 875 in November of last year, I've had 2 replacements since then because of various different failures (like LCD panel stopped working, volume would go up and down as it pleased, and Reon upscaling would result in horizontal sync issues . First things first, I think the 875 is an absolutely fantastic amp - and certainly the only "reference" quality receiver that you will get for less than a grand. The biggest issue I had with it was reliability. The heat that comes off the amp is quite a lot, so adequate space and ventilation is an absolute *MUST* - I am afforded a total of 4 feet either side, 2 feet from the back of the amp to the wall and 2 feet above, and I still think this is still less than Onkyo recommend! Obviously, dependant on your own pain threshold, the amp does get too hot to touch around the back right hand side when running relatively hard. Also, I am quite a warm blooded person, so the heating is rarely on - ambient temp in here right now is 16 degrees, which should keep an amp of that size relatively cool. (Bearing in mind that server farms are only cooled to 20 degrees C!!!!)
I have now had my amp replaced (at no charge) to a 905 - this runs considerably cooler, although I have noticed that they have a "sneaky" limiter in there that isn't in the 875. Plus the addition of better heatsinks and power transfer to the heads in the 905, the introduction of 2 near silent fans, the re-siting of the HQV Reon-VX chip and an overall better construction makes this a much better amp (in terms of reliability) - and now at the same price as what the 875 previously retailed at. To me - it's a no brainer, if you have £1,000 to spend, buy the 905. Or wait for the new 906 due out next month, but expect to pay in the region of £1400 for that bad boy. I also believe the new 876 has some of these improvements, that should retail about £1000 if you can get your hands on one!
I have now had my amp replaced (at no charge) to a 905 - this runs considerably cooler, although I have noticed that they have a "sneaky" limiter in there that isn't in the 875. Plus the addition of better heatsinks and power transfer to the heads in the 905, the introduction of 2 near silent fans, the re-siting of the HQV Reon-VX chip and an overall better construction makes this a much better amp (in terms of reliability) - and now at the same price as what the 875 previously retailed at. To me - it's a no brainer, if you have £1,000 to spend, buy the 905. Or wait for the new 906 due out next month, but expect to pay in the region of £1400 for that bad boy. I also believe the new 876 has some of these improvements, that should retail about £1000 if you can get your hands on one!
Gerrardasnails
Well-known member
orangeburger:NO, this unit is fatally flawed, see my other posts regarding 875. Do not buy this Onkyo.
Let's put this into perspective; The new Sony AV receiver was given a fantastic review by WHF. It is supposed to be an amazing machine for the money. Then someone realises that there is a glitch and you cannot get 5.1 sound through optical on a Sky box when using hdmi. Sony stops sending them out and recalls others and immediately work on sorting the issue out.
Are you telling me Mr Orangeburger that the Onkyos that won every award under the sun both with this mag and others, gets so hot that it sets alight and this is a common problem. They get so hot that you can't touch them. And Onkyo do nothing about it and they just carry on winning awards? You must think people are as mad as you!!
From what I can gather, the big Onks get a little hotter than your average receiver. All manufacturers have products that are faulty from time to time - hence warranties. Anyone who has an amp that gets too hot to touch should send it back to be replaced. As Mr E has mentioned before, these Onkyos are sold all around the world. We do not live in a hot country. Can you imagine how dangerous Mr OB's receiver would be in a house with no AC in Spain in the summer?? It could be classed as a weapon. "Give me your money or I'll make you manually turn the volume down on the Onkyo"!!!
Let's put this into perspective; The new Sony AV receiver was given a fantastic review by WHF. It is supposed to be an amazing machine for the money. Then someone realises that there is a glitch and you cannot get 5.1 sound through optical on a Sky box when using hdmi. Sony stops sending them out and recalls others and immediately work on sorting the issue out.
Are you telling me Mr Orangeburger that the Onkyos that won every award under the sun both with this mag and others, gets so hot that it sets alight and this is a common problem. They get so hot that you can't touch them. And Onkyo do nothing about it and they just carry on winning awards? You must think people are as mad as you!!
From what I can gather, the big Onks get a little hotter than your average receiver. All manufacturers have products that are faulty from time to time - hence warranties. Anyone who has an amp that gets too hot to touch should send it back to be replaced. As Mr E has mentioned before, these Onkyos are sold all around the world. We do not live in a hot country. Can you imagine how dangerous Mr OB's receiver would be in a house with no AC in Spain in the summer?? It could be classed as a weapon. "Give me your money or I'll make you manually turn the volume down on the Onkyo"!!!
I'm on my second brand new Onkyo 875 this month. Bought the first 875, in September 2008 & it just didn't work from day one, no sound at all. Spent 2 wasted evenings checking & double checking all speaker connections etc. Got that one replaced with another supposedly brand new 875 just last week, (although the box it arrived in from Onkyo looked well used & every single piece of polystyrene packaging was smashed).
I was in the middle of a Monty Python movie on this replacement 875, at low volume, (we have 3 very young children sleeping in the house), I was aware of some funny clicking or switching noises coming from the 875, when suddenly there was a pop, the screen went blank, I turned to the 875 to see a red light flashing, followed by a small flame & smoke coming out of the top left handside of the ventilated area. All quite frightening & in hindsight very alarming regarding the fire risk to my house & family.
I have always taken excellent, if not intensive care of my 875, I was well aware it could run quite warm, so it was well ventilated i.e. it was freestanding on my wooden floor, in my dining room, with nothing on top of it. I even opened a window to help it "breathe", even though it was a cold evening. It has always been run at low volume levels.
This model should be subject to an immediate safety recall in my opinion.
I am considering what the next course of action should be. I do not want another 875. Perhaps the 876 has been more vigorously safety tested. Interested to see a previous poster changing to a 905, which has cooling fans. Does the 876 have cooling fans? Perhaps I'll just ask for a full refund & switch to another brand, as my confidence in Onkyo has been so badly affected.
I was in the middle of a Monty Python movie on this replacement 875, at low volume, (we have 3 very young children sleeping in the house), I was aware of some funny clicking or switching noises coming from the 875, when suddenly there was a pop, the screen went blank, I turned to the 875 to see a red light flashing, followed by a small flame & smoke coming out of the top left handside of the ventilated area. All quite frightening & in hindsight very alarming regarding the fire risk to my house & family.
I have always taken excellent, if not intensive care of my 875, I was well aware it could run quite warm, so it was well ventilated i.e. it was freestanding on my wooden floor, in my dining room, with nothing on top of it. I even opened a window to help it "breathe", even though it was a cold evening. It has always been run at low volume levels.
This model should be subject to an immediate safety recall in my opinion.
I am considering what the next course of action should be. I do not want another 875. Perhaps the 876 has been more vigorously safety tested. Interested to see a previous poster changing to a 905, which has cooling fans. Does the 876 have cooling fans? Perhaps I'll just ask for a full refund & switch to another brand, as my confidence in Onkyo has been so badly affected.
Thanks for that information. I am in negotiations with Onkyo at the moment regarding my own dead 875 and have sent them the page address so they can read the reaction of their customers.
Here is the first email from their service desk.
'You have reached the support/help desk for ONKYO Europe.
We assume that your speaker system does not fit to the output power of the
av-receiver.
If the speakers are much to large , the current can be too high so that
finally transformer or amplifier can be damaged.
If you want to drive the receiver at this high levels, you have to take
care that you you have a good air ventilation so that the receiver don't
get to hot and the speaker system must be fitted perfectly.'
I am running pairs of B&W 683, 684 & 685.
I will let you know. Keep playing the music loud...
Here is the first email from their service desk.
'You have reached the support/help desk for ONKYO Europe.
We assume that your speaker system does not fit to the output power of the
av-receiver.
If the speakers are much to large , the current can be too high so that
finally transformer or amplifier can be damaged.
If you want to drive the receiver at this high levels, you have to take
care that you you have a good air ventilation so that the receiver don't
get to hot and the speaker system must be fitted perfectly.'
I am running pairs of B&W 683, 684 & 685.
I will let you know. Keep playing the music loud...
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