Marantz Capable of living up to it WPC specs?

[yepimonfire]

i have a marantz SR7400 and from what i have seen, it's able to pack a big punch, it claims 105WPC. i know many receivers arent capable of outputting their WPC ratings at all channels driven but this thing seems capable, it has a HUGE power transformer in it, the volume rating goes from like -75 - +18, i love listening to music as loud as possible without going deaf and even i cant stand the volume past -25 using 5 150w rms rated speakers. once the volume goes past -15 the lights go dim on every kick-drum kick, keeping in mind this is all channels driven at the same time, im not sure how much current drain it would take to actually dim lights, but im sure it's a hell of a lot. anyone had a chance to test a marantz amplifier to see if it can do what it claims? i honestly am not sure what this means but the specs for it say it has "7 discrete amplifiers" in it.

Thoughts? Comments? Anyone?

p.s. i know this is quite random, but hey, im a random guy.
p.s.s. several people on here seem to imply i make claims that aren't true such as being able to faintly hear 30khz, just so you know i do not make things up to hear myself talk (or type in this case) when i say the lights dim on kick-drums i am being honest.

 

[anamorphic96]

Marantz policy is that all of their HT receivers be able to put out 70% of rated power when all channels are driven.
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Most of the reviews I have seen that have measurements seem to back up this statement. In general Marantz is better than most of the others in power output.

 

[bandphan]

And its all dependent on your speakers specs When listening to music loud with an efficient speaker you will be surprised at how few watts are actually used.

here is a calculator to play with

 

[markw]

"once the volume goes past -15 the lights go dim on every kick-drum kick"

IIWY, I'd be more concerned with my mains being able to handle the current draw than the amp putting nout what's obviously more than you can handle.

Don't you have a subwoofer to handle the heavy lifting?

 

[highfigh]

i have a marantz SR7400 and from what i have seen, it's able to pack a big punch, it claims 105WPC. i know many receivers arent capable of outputting their WPC ratings at all channels driven but this thing seems capable, it has a HUGE power transformer in it, the volume rating goes from like -75 - +18, i love listening to music as loud as possible without going deaf and even i cant stand the volume past -25 using 5 150w rms rated speakers. once the volume goes past -15 the lights go dim on every kick-drum kick, keeping in mind this is all channels driven at the same time, im not sure how much current drain it would take to actually dim lights, but im sure it's a hell of a lot. anyone had a chance to test a marantz amplifier to see if it can do what it claims? i honestly am not sure what this means but the specs for it say it has "7 discrete amplifiers" in it.

Thoughts? Comments? Anyone?

p.s. i know this is quite random, but hey, im a random guy.
p.s.s. several people on here seem to imply i make claims that aren't true such as being able to faintly hear 30khz, just so you know i do not make things up to hear myself talk (or type in this case) when i say the lights dim on kick-drums i am being honest.

The power handling of the speaker has nothing to do with how much output you get at a particular power level. If your lights are dimming, you have A) loose connections on at least one outlet, B) the amp is drawing enough to cause voltage drop or C) the circuit isn't able to handle the current.

Check the line voltage and watch it when you're playing the stereo. If it drops considerably or is extremely unstable, compare it with the voltage when the stereo is off. If the fluctuations are still there when the stereo is off, have an electrician check into why this is happening. Loose connections and broken wires cause fires.

As far as hearing 30KHz, I doubt it and you're not testing your hearing in a controlled, scientific way. If you can hear an actual tone, like a musical note, you're probably hearing a sub-harmonic of the actual tone. In order to verify the ability to hear that high, you would need to be absolutely sure the source, amplifier and speakers/headphones aren't causing whatever you're hearing. High percentage harmonic distortion can be an octave below the tone that's being used and one octave below 30KHz is 15KHz. It can also me some other harmonic.

You posted "i love listening to music as loud as possible without going deaf"- that's not possible. Being exposed to high decibel sound and going deaf go hand in hand and can't be avoided. It's not a sudden thing but it happens to everyone. If you hear ANY ringing when you're in a quiet place, you already have hearing damage. While it may improve over time after not being exposed to loud sounds, hearing doesn't go back to the way it was before the first exposure.

 

[gene]

Discrete Amplifiers and All Channels Driven Test

anyone had a chance to test a marantz amplifier to see if it can do what it claims? i honestly am not sure what this means but the specs for it say it has "7 discrete amplifiers" in it.

Discrete amplifers means they are designed with transistors instead of integrated opamps. Most receivers in this price range use discrete amps. Thats a good thing.

Don't worry about the classic ACD test as its not representative of real world usage unless you plan on listening to continuous sine waves played on all the speakers at the same time and in the same phase.

Read:
http://www.audioholics.com/education...amplifier-test

 

[yepimonfire]

no i dont have a sub, i dont need one, no it was not harmonic distortion, it was a 30khz sine wave with exteremly sensitive heavphone, no there is nothing wrong with my wiring, this has happened in two of the homes i have had this set up in, when i said i like to listen to it as loud as possible without going deaf, i was being funny, i dont really listen loud enough to do any damage to my hearing.

also marantz is probably my favorite receiver company, i love how clean their receivers sound.

 

[JerryLove]

no i dont have a sub, i dont need one,

I wouldn't dream of telling you what you do or do not need.

no it was not harmonic distortion, it was a 30khz sine wave

And you know this as a fact how?

with exteremly sensitive heavphone,

Sensitivity of a speaker is the ratio of SPL to power... as this has nothing to do with your claimed test, I have to assume that you are misusing the term. That assumption leads me to question your knowledge relative to the other claims you are making.

no there is nothing wrong with my wiring, this has happened in two of the homes i have had this set up in

The maximum output of your amp (rated) is 745W. I have a pair of speakers capable of drawing near 1000 (never mind the surrounds, and TV, and 300W halogen lights on the same circuit) and don't experience what you are describing.

To know that there's nothing wrong with your wiring would require that you did know what was causing the problem (negative claims are exclusionary). What is causing the lights to dim under a <750W load?

For that matter, what rating circuit/wire is powering your receiver?

And for the topic: even if the Marantz did not (lets say running half rated wattage), you would loose no more than 3db under a full sine-wave.

 

[KEW]

no it was not harmonic distortion

Sorry, but there is no way you could know this for certain without more test gear than any normal audio buff would have. I'm not saying it is impossible (I have no idea what HF limit might be possible), however you are speaking in absolute certainty about a subjective perception. As said, harmonics are generated. They don't sound like distortion as we normally think of it because they are pure tones that harmonize with the principle note.

As for Marantz's power specs, they do seem better than many receivers. Here is a neat test involving a Marantz receiver rated at 100 WPC and you can see how the number of channels driven affect the wattage:
http://www.soundandvisionmag.com/receivers/3143/marantz-sr6003-av-receiver-ergonomics-page2.html
It is very close to 100WPC with all 7 channels driven!

 

[j_garcia]

Here's the thing: under NORMAL listening conditions, you won't need the full rated power. A sine wave is not normal conditions. I've seen specs for my 8300, rated for 120W and it actually benched at 92W under load which is pretty good. The 7400 uses a similar (but smaller) power supply and amps, so it should not have a problem delivering close to its rated power with two channels driven. On the other hand, my PM7200 is rated at 95x2 and benched at 105W

 

[yepimonfire]

no it was not harmonic distortion, it was a 30khz sine wave
And you know this as a fact how?

because fool i mentioned earlier it was a sine wave generator, you need to pay attention more.

with exteremly sensitive heavphone,

Sensitivity of a speaker is the ratio of SPL to power... as this has nothing to do with your claimed test, I have to assume that you are misusing the term. That assumption leads me to question your knowledge relative to the other claims you are making.

sensitive in the frequency range, the drivers had a claimed15 - 42khz freq, response.

The maximum output of your amp (rated) is 745W. I have a pair of speakers capable of drawing near 1000 (never mind the surrounds, and TV, and 300W halogen lights on the same circuit) and don't experience what you are describing.

To know that there's nothing wrong with your wiring would require that you did know what was causing the problem (negative claims are exclusionary). What is causing the lights to dim under a <750W load?

For that matter, what rating circuit/wire is powering your receiver?

first off the dimming is not that extreme, they very slightly dim when the volume is at -15 on kick-drum kicks

secondly i have the receiver hooked into a dedicated outlet capable of being under a 2000w load.

 

[yepimonfire]

Here's the thing: under NORMAL listening conditions, you won't need the full rated power. A sine wave is not normal conditions. I've seen specs for my 8300, rated for 120W and it actually benched at 92W under load which is pretty good. The 7400 uses a similar (but smaller) power supply and amps, so it should not have a problem delivering close to its rated power with two channels driven. On the other hand, my PM7200 is rated at 95x2 and benched at 105W

yes i know i will never ever ever need it to deliver its max rating, to go that loud would deafen me. i also dont know how big of a power block you have in your 8300, but if mine is smaller then yours, it must be really really damned big

 

[mtrycrafts]

..., no it was not harmonic distortion, it was a 30khz sine wave with exteremly sensitive heavphone, ....

Where did you find that 30kHz test tone?
IM distortion is caused by your headphone as a good possibility.
At what level did you have to play it to hear it?
The threshold of detection of higher frequency above 16kHz if approaching 100 dB spl and above.
Stewart of Meridian and others have never heard of a person with such high frequency hearing ability. Very few go up to 26kHz, very few. I doubt your name is on that list.

 

[JerryLove]

because fool i mentioned earlier it was a sine wave generator, you need to pay attention more.

I didn't ask how you knew the frequency of the source: I asked how you knew you weren't hearing sub harmonics.

It seems as though you don't understand the question or what causes sub-harmonics.

sensitive in the frequency range, the drivers had a claimed15 - 42khz freq, response.

And your misuse of the word is worrysome.

first off the dimming is not that extreme, they very slightly dim when the volume is at -15 on kick-drum kicks

secondly i have the receiver hooked into a dedicated outlet capable of being under a 2000w load.

Which would be 16-amps @120V (15 and 20 do), which doesn't really exist.

If your house is new, you likely have a 20+ amp recepticle and wire. The limit would be the breaker. Again, the fact that you do not use correct language makes it seem unlikely that you understand what is actually occuring.

It is unlikely in the extreme that you heard 35Khz. It is far more likely that the headphones were producing sub-harmonics of 35KHz that you did hear.

 

[bandphan]

I thought someone "kindly" asked the op to remove something from their sig

 

[yepimonfire]

I didn't ask how you knew the frequency of the source: I asked how you knew you weren't hearing sub harmonics.

It seems as though you don't understand the question or what causes sub-harmonics.

And your misuse of the word is worrysome.

Which would be 16-amps @120V (15 and 20 do), which doesn't really exist.

If your house is new, you likely have a 20+ amp recepticle and wire. The limit would be the breaker. Again, the fact that you do not use correct language makes it seem unlikely that you understand what is actually occuring.

It is unlikely in the extreme that you heard 35Khz. It is far more likely that the headphones were producing sub-harmonics of 35KHz that you did hear.

i never said 35khz, i can't hear a 35khz tone, i can BARELY hear 30khz as it is. i actually top off at the same volume level ( meaning the same volume for every tone in order to be heard) at around 24khz, i doubt i have a, for lack of better word(s), same volume hearing range for the 30khz, as i have stated before, i had to really crank up the vol. to hear it. doesent matter, im not going to continuously argue with you for no reason to prove my point, no matter how much of an *** you are, if i can hear i can hear it, i dont need your "approval". and just so you know, i said i dont need a sub because i am satisfied with the bass output of my towers.

 

[bandphan]

Dont talk back to me

couldnt resist

 

[mike c]

don't feed the ...

 

[bandphan]

don't feed the ...

you said they might go hungry

 

[yepimonfire]