Review: Crown new DriveCore XLS 1000 Class D Pro Amp - Page 4 - AVS Forum
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post #91 of 102 Old 10-31-2014, 09:15 PM
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According to their manuals, the Crown XLS series sensitivity is 1.4 V while the Yamaha RX-V1075 pre-outs are rated at 1.0 V. So, you would need a gain stage to drive the Crown to maximum output.

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post #92 of 102 Old 10-31-2014, 09:28 PM
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I have an older Yamaha HTR-5280 (2001) and it works fine with a Crown XLS1000. You might have to have to reduce level of your mains depending on their sensitivity. On my Yamaha there is setting under 'Speaker setup' to reduce the Mains by -10db, which allows for a higher relative level to go to the surrounds and sub-woofer output.
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post #93 of 102 Old 10-31-2014, 09:56 PM
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Quote:
Originally Posted by DonH50 View Post
According to their manuals, the Crown XLS series sensitivity is 1.4 V while the Yamaha RX-V1075 pre-outs are rated at 1.0 V. So, you would need a gain stage to drive the Crown to maximum output.
Depending on speaker sensitivity, desired SPL, room size, and listening distance, it might work as-is, or perhaps by bumping up the level trims.

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post #94 of 102 Old 11-01-2014, 10:26 AM
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The real question is if an amplifier of any sort is even needed.

Check out an SPL guide like the one linked below to see if you really need extra power.

http://myhometheater.homestead.com/splcalculator.html

"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley
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post #95 of 102 Old 11-01-2014, 10:54 AM
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whether a particular preamp can drive a specific amp to full power is, in the end, a different question than whether the pre can drive it hard enough for a particular use, and whether inserting the amp will require channel level adjustments u or down. Almost certainly, the amp will have a different gain than the internal amps of a receiver, and will require an appropriate adjustment in channel levels to keep everything in perspective once the amp is added. But since we never really know exactly how the internal gain staging works in any given receiver, it's just a guess whether the adjustment will be positive or negative, seems to me.

And probably for many if not most of us, whether the preamp can drive the amp to full power has no real meaning. Certainly in my room, where max levels reach perhaps -10dB from reference and I use a sub, I don't likely ever use even 50 watts from the amps driving the LCR and surrounds, so whether I can theoretically get full power out of a 100, or 1000 watt amp doesn't matter. I never will use that much power anyway.
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post #96 of 102 Old 11-01-2014, 11:06 AM
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Quote:
Originally Posted by DonH50 View Post
The real question is if an amplifier of any sort is even needed.

Check out an SPL guide like the one linked below to see if you really need extra power.

http://myhometheater.homestead.com/splcalculator.html
SPL isn't the only thing to consider. Depending on the dynamics of the material an external amplifier can provide headroom for the mains as well the remaining AVR channels.
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post #97 of 102 Old 11-01-2014, 11:14 AM
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What? Dynamics is directly related to SPL, and headroom... And, unused headroom is just a waste of money and energy.

I do agree SPL is not the only thing to consider, but for amplifiers it is usually the primary thing. The major other things I would consider are speaker impedance and listener preference (e.g. looking for a particular sound that something like tube amplifiers provide). You need an amplifier that drives your speakers to the levels you desire in your room and at your listening position (distance from speakers). That's a lot of variables, most of of which were not defined by the poster, thus the link to the SPL calculator.

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post #98 of 102 Old 11-01-2014, 11:20 AM
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Quote:
Originally Posted by DonH50 View Post
What? Dynamics is directly related to SPL, and headroom... And, unused headroom is just a waste of money and energy.
SPL is a reference to constant levels not instantaneous peaks.
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post #99 of 102 Old 11-01-2014, 01:53 PM
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Hmmmm... Not what my grad book on acoustics says but whatever. It defines average and peak SPL's among other metrics. It also uses equations and stuff not usually seen on an audiophile forum so maybe definitions vary. Certainly the target audience does.

"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley
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post #100 of 102 Old 11-01-2014, 10:49 PM
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My SPL meter clearly can average slow or fast, which is just the sampling interval I guess for the average. But why can't there be a peak SPL?

"But this one goes up to 11"
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post #101 of 102 Old 11-02-2014, 07:18 AM
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There are peak SPLs. What i was referring to, is that when guidelines are given for sufficient SPL levels and adequate amplification people are generally speaking of constant level of volume. Highly dynamic music and movies can easily exceed the capabilities of an AVR. Using a subwoofer helps, but it all depends on how loud the SPL is when the dynamic SPLs hit.
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post #102 of 102 Old 11-02-2014, 12:07 PM
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OK. I was not making such a distinction. I use SPL (calculators) to estimate the power required to attain both average and peak levels. E.g. if you normally listen at 70 dB and it takes 0.1 W to get there at the listening position, then if a 30 dB peak comes along you need 100 W to reach 100 dB. Or whatever.

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