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post #1 of 11 Old 02-23-2015, 01:10 AM - Thread Starter
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Home Theater Advice on adding Amp

Not an AV expert by any means but I am building a dedicated small home theater (11x14) with a 110" projection screen and a 7.2.4 Dolby Atmos setup will all in wall speakers and two in wall subs. The receiver I have is a Pioneer SC-87 but I have the option to add a Integra 70.1. My question is will I get a big boost in performance by adding the Integra and am I creating a possible problem down the line?

The room will be mostly used for watching TV/movies mostly streaming, 30% PS4 gaming and some Blurays. If I am missing anything please let me know.
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post #2 of 11 Old 02-23-2015, 03:02 AM
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FYI

http://www.soundandvision.com/conten...-labs-measures

One has to wonder what the output will be with all channels driven is.

Pivetta Opera
Bose Jewel speakers.
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post #3 of 11 Old 02-23-2015, 03:14 AM
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Quote:
Originally Posted by pmbaudio View Post
Not an AV expert by any means but I am building a dedicated small home theater (11x14) with a 110" projection screen and a 7.2.4 Dolby Atmos setup will all in wall speakers and two in wall subs. The receiver I have is a Pioneer SC-87 but I have the option to add a Integra 70.1. My question is will I get a big boost in performance by adding the Integra and am I creating a possible problem down the line?

The room will be mostly used for watching TV/movies mostly streaming, 30% PS4 gaming and some Blurays. If I am missing anything please let me know.
You're missing the specific speakers models, though if they are in-walls designed for home theater, they are probably at 90dB efficiency anyway, which means you'll gain nothing from the amp except a tiny bit of headroom you'll never likely use.
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post #4 of 11 Old 02-23-2015, 03:19 AM
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Quote:
Originally Posted by fatbottom View Post
FYI

http://www.soundandvision.com/conten...-labs-measures

One has to wonder what the output will be with all channels driven is.
Wonder no longer. That link has the info:
Integra DTA-70.1 Amplifier

Seven channels driven continuously into 8-ohm loads:
0.1% distortion at 111.5 watts
1% distortion at 125.2 watts

But it doesn't matter because the only signals capable of driving all channels to full output simultaneously are test signals. No soundtrack ever produced has that capability.
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post #5 of 11 Old 02-23-2015, 03:22 AM
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That's a 9 channel power amplifier, not a 7

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Bose Jewel speakers.
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post #6 of 11 Old 02-23-2015, 07:09 AM
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My mistake, but big deal. I goes from 175 @ 1% two channels driven to 125 @ 1% 7 channels driven, a "whopping" 1.5dB, which is barely audible. Add two more channels, what do you think will happen? Another fraction of a dB? Again, zero chance of a soundtrack driving 7 simultaneously to full output, zero chance of doing that with 9 too.

While we're at it, the Pioneer SC-87 is rated 810 (ACD), which is 90/channel, which is 1.5dB lower than the Integra with 7 driven, probably 1dB lower with the Integra driving all 9.

When driving two channels at 8 ohms to about .1%, the Integra does 154 Watts (measured) and the Pioneer specs at 140, which is a 0.4dB difference, and reflects a more realistic assessment of real headroom in operation with program material.

My recommendation stands: ignore the power amp. And just adding, throw that money at speakers.
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post #7 of 11 Old 02-23-2015, 07:16 AM
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No it's 111W for 7 channels. Add two more speakers and it'll be lower.

Pivetta Opera
Bose Jewel speakers.
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post #8 of 11 Old 02-23-2015, 01:41 PM - Thread Starter
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Quote:
Originally Posted by audio2xs View Post
You're missing the specific speakers models, though if they are in-walls designed for home theater, they are probably at 90dB efficiency anyway, which means you'll gain nothing from the amp except a tiny bit of headroom you'll never likely use.
Using Jamo in walls - sorry cant post links just yet (mostly been a lurker here for years)

JAMO

IW626LCR
IW606SUR
IC606FG
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post #9 of 11 Old Yesterday, 01:31 AM
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No it's 111W for 7 channels. Add two more speakers and it'll be lower.
I stated it correctly, it's 125 for 7 channels @ 1% THD.

I also stated correctly that it would be lower for two more speakers. But it won't be all that much lower, most likely a fraction of a dB.
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post #10 of 11 Old Yesterday, 01:32 AM
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Quote:
Originally Posted by pmbaudio View Post
Using Jamo in walls - sorry cant post links just yet (mostly been a lurker here for years)

JAMO

IW626LCR
IW606SUR
IC606FG
IW626LCR sensitivity is 90dB/1w/1m

Again, no need for the extra power.
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post #11 of 11 Unread Today, 04:45 PM - Thread Starter
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Quote:
Originally Posted by audio2xs View Post
IW626LCR sensitivity is 90dB/1w/1m

Again, no need for the extra power.
Thanks for the replies.
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