Yamaha Pro Amps

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K

Kitsum

Junior Audioholic
Yes any consumer preamp can drive my RMX4050 without converters, these are the specs to look for in a pro amp,
QSC RMX 4050HD:

Voltage Gain 64x (36 dB) for 8 ohm load
Input Sensitivity 1.25 Vrms for 800 W into 8 ohms 1.12 Vrms for 650 W into 8 ohms

Most consumer preamps have a voltage gain of 24db, enough to drive most pro amps.
 
WmAx

WmAx

Audioholic Samurai
Kitsum said:
Yes any consumer preamp can drive my RMX4050 without converters, these are the specs to look for in a pro amp,
QSC RMX 4050HD:

Voltage Gain 64x (36 dB) for 8 ohm load
Input Sensitivity 1.25 Vrms for 800 W into 8 ohms 1.12 Vrms for 650 W into 8 ohms

Most consumer preamps have a voltage gain of 24db, enough to drive most pro amps.
Click to expand...
Actually, many people have noise/etc. problems with direct connection of consumer rca outs to pro amps. The input sens. spec assumes the input gain dials full open; a bad idea most of the time, unless one likes the resultant noise.

-Chris
 
zman1974

zman1974

Enthusiast
When I do receive the S-Convert where should the gains be set then? Should I run them fully open, or half way, or does it matter at all since Audessey will set the level anyway?

Jim
 
WaynePflughaupt

WaynePflughaupt

Audioholic Samurai
Why are you getting an S-Convert? From your previous post, it sounds like you were able to get a good gain setting without one.

Regards,
Wayne A. Pflughaupt
 
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zman1974

zman1974

Enthusiast
I am getting some hiss when the amp gain is set at a high level. I still don't quite understand the whole gain thing with the amp (have no previous experience with pro amps). Is it considered better to have the gains fully open, or not, or does it matter? Liek I said, I have the gains at about 2:30, and a may here a tiny hiss from point blank range, but inaudible at all other distances.

Jim
 
WaynePflughaupt

WaynePflughaupt

Audioholic Samurai
Were you getting the hiss with the previous amplifier? Did you try gain-matching the old and new amps as I suggested?

If you're getting the noise when you have your pre amp's volume control set very high, it could be the source.

Regards,
Wayne A. Pflughaupt
 
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zman1974

zman1974

Enthusiast
No, I don't get that level of hiss with the Earthquake. I did gain match like you suggested before I ran Audessey. After I ran Audessey, I moved the gains up on the amp just to see what would happen, and that's when I got a great deal of hiss. Like I said, with the gains set at around the 2:30 position I don't here any pronounced hiss.

So, according to Chris, if I here such a hiss, no matter the gain setting, I need the S-Convert, but are you saying I shouldn't use it if I don't here the (pronounced) hiss at the 2:30 setting?
 
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WaynePflughaupt

WaynePflughaupt

Audioholic Samurai
So, according to Chris, if I here such a hiss, no matter the gain setting, I need the S-Convert, but are you saying I don't?
Click to expand...
No, that’s not what I’m saying. I’m just trying to help you figure out if you really need an S-Convert before you go out and spend the money on one.


I did gain match like you suggested before I ran Audessey. After I ran Audessey, I moved the gains up on the amp just to see what would happen, and that's when I got a great deal of hiss. Like I said, with the gains set at around the 2:30 position I don't here any pronounced hiss.
Click to expand...
The only gain setting that matters is the one you end up using, not whatever you can run it up to to generate noise. If you were able to gain-match the Yamaha with the original amp with the Yamaha’s gains at 2:30, and your pre amp can activate the clip meters, then that’s the gain setting you should use. At that point the only reason the S-Convert would be an option is if you’re experiencing more background noise (hiss) than you were with the original amp. Or if you feel that any increase in noise that may be present is objectionable.

Regards,
Wayne A. Pflughaupt
 
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zman1974

zman1974

Enthusiast
Well, I will try it out in my system; if it has no appreciable effect I will return it.

Can't hurt, either way.

Jim
 
haraldo

haraldo

Audioholic Warlord
It is stated in Yamaha techinfo that the EEEngine both uses Class D and Class AB in combination, I try to understand this, but cannot......
http://www.yamahaproaudio.com/topics/leading_technology/learn_more_about_eeengine/index.html

There's a whole bunch of pro power amps and I cannot find any discussion around this in these threads....

There is an XP series of Poweramps that looks exactly similar to the P series, but is considerably more pricey
It's not immediately obvious what's the difference between these and if XP series will be audibly superior to the P series... in a home audio setting...

Does anyone kno what's the real difference between these and if it's worthwhile in a home audio setting to go the extra step for an XPn000...
http://www.yamahaproaudio.com/products/power_amps/p7000s/index.html

http://www.yamahaproaudio.com/products/power_amps/xp7000/index.html
 
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WaynePflughaupt

WaynePflughaupt

Audioholic Samurai
The XP series is geared towards installations, and has features that a contractor would find useful for installations, such as Euroblock inputs and a port for remote monitoring or control. A couple of the models also support 70- or 100-volt installations, which is what ceiling speakers in restaurants etc. typically are.

If the XPs cost more than the regular P series, there’s no good reason to go for it, unless perhaps you prefer the black face to the blue.

Regards,
Wayne A. Pflughaupt
 
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jp_over

jp_over

Full Audioholic
s convert

How did the s convert work out - I'm looking at this set up myself. Thanks!
 
C

Codifus

Junior Audioholic
zman1974 said:
Guys,

One other question:

What point should one set the gains? I noticed some set them at max, while others set them a little before 12:00. Are there any hard and fast rules that I should follow?

Jim
Click to expand...
I have a Behringer EP2000 and used this method to set the gains;

1st, and most importantly, DIS-CONNECT your speakers. The test tone described in the next step can fry xovers/tweeters/mid-ranges easily.
I used my digital audio workstation to record a 1 Khz sine wave at 0 db.
I played that 1 Khz tone with my DAC's variable output set to max volume.
On my Behringer, I adjusted the gains from zero until the red clipping LEDs just started to light up.
Done. Power down and connect your speakers.

When I had previously set the gains by ear, I was all over the map. 11 oclock, 12 oclock etc. I also accidentally got to feel the wicked power of the amp too:eek:

With the system I described above, I wound up using 9 oclock.

Hope this helps

CD
 
jp_over

jp_over

Full Audioholic
from yamaha on direct connect receiver to pro amp

"HI Joe; unbalanced inputs are ok [receiver direct to yamaha pro amp] , if you are running more than 15 ft of cable a direct box to balance the signal and then use xlr to xlr cables is preferred . For short cable lengths a rca to unbalanced 1/4 in phone is fine. hope this helps EB"

This is for a P2500S amp.
 
T

techenvy

Enthusiast
how about the yamhah rx 797 vs the new rs700?
i cannot decide

the rx 797 allow syou to use the remote to switch between speakers a/b does the new r s700 allow this via remote??????
 
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