Internal Amp of Onkyo 818 or use Marantz MM9000 Amp - AVS Forum
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post #1 of 14 Old 11-24-2012, 02:39 PM - Thread Starter
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I just purchased an Onkyo 818 receiver and wanted to know if the internal amp is equal to my old Marantz MM9000. The Marantz is 150x5 and I have a 5.1 setup. I think the Onkyo is 135x7. Is it worth using my old amp with this instead of the internal? Thanks.

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post #2 of 14 Old 11-24-2012, 03:11 PM
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Quote:
Originally Posted by myriadcorp View Post

I just purchased an Onkyo 818 receiver and wanted to know if the internal amp is equal to my old Marantz MM9000. The Marantz is 150x5 and I have a 5.1 setup. I think the Onkyo is 135x7. Is it worth using my old amp with this instead of the internal? Thanks.

Hi, I'd like to give you a comprehensive reply, but in order to do so, I'd like to know what AVR you had before the Onkyo 818 (hooked up to the Marantz PA) and how familiar you are with Audyssey.
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post #3 of 14 Old 11-24-2012, 03:43 PM - Thread Starter
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I don't have the Onkyo yet but I have a B&K Reference 50 S2 hooked up to the Marantz. I have used Audyssey XT before on two other receivers. This unit is going to drive two Klipsch RF 35's, two RS 7's. and one RC7.

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post #4 of 14 Old 11-24-2012, 04:27 PM
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Quote:
Originally Posted by myriadcorp View Post

I don't have the Onkyo yet but I have a B&K Reference 50 S2 hooked up to the Marantz. I have used Audyssey XT before on two other receivers. This unit is going to drive two Klipsch RF 35's, two RS 7's. and one RC7.

I think your Klipsch speakers, while each are rated 8 Ohms at 98 dB sensitivity, will surely have no problem to be driven by the internal amps of the Onkyo 818 rated at 135 Watts. Anyhow, you are in a lucky situation, coz you can compare the Onkyo to the Marantz. Hook them up to each, run Audyssey on the Onkyo and check the speaker channel level trims for both cases. Should they all be between +/- 15 dB you are good to go. With the Marantz you may have a bit more headroom, but that will be really subtle. Take care not to adjust the input level knob on the back side of the Marantz after running Audyssey coz that will throw off DynamicEQ. BTW, among your speaker list you didn't mention a sub!

Report back please. smile.gif
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post #5 of 14 Old 11-25-2012, 10:27 AM - Thread Starter
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Originally Posted by mogorf View Post

I think your Klipsch speakers, while each are rated 8 Ohms at 98 dB sensitivity, will surely have no problem to be driven by the internal amps of the Onkyo 818 rated at 135 Watts. Anyhow, you are in a lucky situation, coz you can compare the Onkyo to the Marantz. Hook them up to each, run Audyssey on the Onkyo and check the speaker channel level trims for both cases. Should they all be between +/- 15 dB you are good to go. With the Marantz you may have a bit more headroom, but that will be really subtle. Take care not to adjust the input level knob on the back side of the Marantz after running Audyssey coz that will throw off DynamicEQ. BTW, among your speaker list you didn't mention a sub!
Report back please. smile.gif

For the sub I have a SVS PB2-Plus. It has built in crossovers and phasing controls. What should I set that to when I run the Xt32 setup?

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post #6 of 14 Old 11-25-2012, 10:57 AM
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Quote:
Originally Posted by myriadcorp View Post

For the sub I have a SVS PB2-Plus. It has built in crossovers and phasing controls. What should I set that to when I run the Xt32 setup?

Set them as follows:

Crossover: max.
Phase: 0
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post #7 of 14 Old 11-25-2012, 10:58 AM
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Quote:
Originally Posted by myriadcorp View Post

I just purchased an Onkyo 818 receiver and wanted to know if the internal amp is equal to my old Marantz MM9000. The Marantz is 150x5 and I have a 5.1 setup. I think the Onkyo is 135x7. Is it worth using my old amp with this instead of the internal? Thanks.

On amplifier ratings...

The Onkyo 818 is NOT a 135watt x 7 amp. It's a 135watt x 2 amp, into 6ohms, at .7% THD.

The Marantz is a 150watt x 5 amp, into 8ohms, at .05% THD.

Apples to apples, in a 8ohm load the numbers would look more like...

Onkyo 80wpc x 5 acd
Marantz 150wpc x 5 acd

There's no doubt the Martanz is a much more robust amp.

The questions truly are:

Will you miss the extra power?
What amp sound would you prefer?
If you didn't need the Marantz, what would you do with it?
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post #8 of 14 Old 11-25-2012, 11:14 AM - Thread Starter
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Quote:
Originally Posted by NorCalJason View Post

On amplifier ratings...
The Onkyo 818 is NOT a 135watt x 7 amp. It's a 135watt x 2 amp, into 6ohms, at .7% THD.
The Marantz is a 150watt x 5 amp, into 8ohms, at .05% THD.
Apples to apples, in a 8ohm load the numbers would look more like...
Onkyo 80wpc x 5 acd
Marantz 150wpc x 5 acd
There's no doubt the Martanz is a much more robust amp.
The questions truly are:
Will you miss the extra power?
What amp sound would you prefer?
If you didn't need the Marantz, what would you do with it?

Guess I will just leave the Marantz hooked up. It's a nice little amp I purchased years ago.

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post #9 of 14 Old 11-25-2012, 11:16 AM
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Quote:
Originally Posted by myriadcorp View Post

Guess I will just leave the Marantz hooked up. It's a nice little amp I purchased years ago.

Wouldn't it be fun to try them both?

wink.gif
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post #10 of 14 Old 11-25-2012, 11:52 AM
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Quote:
Originally Posted by myriadcorp View Post


For the sub I have a SVS PB2-Plus. It has built in crossovers and phasing controls. What should I set that to when I run the Xt32 setup?

 

The Audyssey FAQ goes into detail on this topic:

 

f)3.   How do I set the controls on my subwoofer before running MultEQ?

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post #11 of 14 Old 11-25-2012, 12:37 PM - Thread Starter
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Quote:
Originally Posted by NorCalJason View Post

Wouldn't it be fun to try them both?
wink.gif

If I had banana plugs on the speaker wires it would be. smile.gif

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post #12 of 14 Old 11-25-2012, 12:41 PM
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Why wouldn't you run the amp you already have? Doubling of power is 3db so not huge difference. However the onkyo's can run hot so it will probably be easier on it to continue to use an external amp. I have the 818 on the way and have rf 35's and rc7 up front as well.cool.gif
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post #13 of 14 Old 11-25-2012, 12:44 PM - Thread Starter
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Originally Posted by Luke Kamp View Post

Why wouldn't you run the amp you already have? Doubling of power is 3db so not huge difference. However the onkyo's can run hot so it will probably be easier on it to continue to use an external amp. I have the 818 on the way and have rf 35's and rc7 up front as well.cool.gif

The Marantz amp runs very cool. I plan on just leaving it hooked up. It's a great amp that's over 10 years old.

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post #14 of 14 Old 06-19-2013, 02:33 AM
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This old thread has just made me reconsider selling my MM9000 as the Mirage Omni series speakers i have are relatively inefficient compared to the speakers other have mentioned using with the TX-NR818... No to find a used pre/pro at a smoking good deal or save my pennies for the 818 that i was planning on selling the MM9000 for...I like the Audyssey XT32 that the 818 offers at its price level...
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