crown d150a

khelben · 3rd June 2005, 07:30 PM

new to all this so hope im in the right spot

on the back of my crown amp it says " max input 750 watts"

does that mean i can run a line from the input to a speaker output on my yamaha receiver without "burning" the amp?

(the amp connects to a peavey 412s 4 ohm box

Netlist · 3rd June 2005, 07:40 PM

Hi khelben,
I think you are mixing up a few things here.
I haven't got a clue what the Max input 750W could be.
The d150a has an output of 2 X 75W IIRC.
Connecting the input of the crown to the output of a receiver is not a good idea. (You will burn things).
Where are the Peavey's connected to? The Yamaha or the Crown?

/Hugo

SY · 3rd June 2005, 07:42 PM

That number is the power consumption from the wall socket. It doesn't relate to input sensitivity. You'll want to pad down the output of your receiver or, better yet, trace where the receiver power amp input is and connect that point to the Crown.

khelben · 3rd June 2005, 07:49 PM

peavey> crown> ?need to connect to receiver

the receiver wont power the peavey by itself

khelben · 3rd June 2005, 07:49 PM

Quote:

Originally posted by SY
That number is the power consumption from the wall socket. It doesn't relate to input sensitivity. You'll want to pad down the output of your receiver or, better yet, trace where the receiver power amp input is and connect that point to the Crown.

pad down?how?

amp input/ from schematic of the receiver?solder in my own connection/mod ?

SY · 3rd June 2005, 07:58 PM

You can use a couple of resistors per channel to form the pad. Without knowing anything about the Yamaha, I'd guess that you want something like a 10:1 reduction in voltage. The exact number is not critical. If that's not clear to you, best not start soldering.

The other thing you can do is use the tape monitor output of the Yamaha, then control the volume with the Crown's input attenuators.

djk · 3rd June 2005, 08:13 PM

" max input 750 watts"

Power factor on cap input filter is about 0.6

Thus the watts available to consume about 450W

Amp will do 240W bridged at 8 ohms

Efficency is thus about 53%, about right for a class AB amplifier with an unregulated supply.

With a regulated supply the theoretical efficency of a class AB amplifier is 78.5%

khelben · 3rd June 2005, 08:17 PM

ok, set up is <pc sound card- yamaha htr5240-main speakers-crown/peavey as sub>

the yamaha has a sub output that i cant get to work

Netlist · 3rd June 2005, 08:28 PM

The sub output will only work in surround mode, not in normal stereo mode methinks.

/Hugo

khelben · 3rd June 2005, 08:45 PM

so how best , easy way to connect crown/peavey to system?

(yes noob here)

3rd June 2005, 07:30 PM	#1
khelben diyAudio Member Join Date: Jun 2005 Location: oklahoma	crown d150a new to all this so hope im in the right spot on the back of my crown amp it says " max input 750 watts" does that mean i can run a line from the input to a speaker output on my yamaha receiver without "burning" the amp? (the amp connects to a peavey 412s 4 ohm box __________________ fear profits man nothing

3rd June 2005, 07:42 PM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	That number is the power consumption from the wall socket. It doesn't relate to input sensitivity. You'll want to pad down the output of your receiver or, better yet, trace where the receiver power amp input is and connect that point to the Crown. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

3rd June 2005, 07:49 PM	#4
khelben diyAudio Member Join Date: Jun 2005 Location: oklahoma	peavey> crown> ?need to connect to receiver the receiver wont power the peavey by itself __________________ fear profits man nothing

3rd June 2005, 07:58 PM	#6
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	You can use a couple of resistors per channel to form the pad. Without knowing anything about the Yamaha, I'd guess that you want something like a 10:1 reduction in voltage. The exact number is not critical. If that's not clear to you, best not start soldering. The other thing you can do is use the tape monitor output of the Yamaha, then control the volume with the Crown's input attenuators. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

3rd June 2005, 08:17 PM	#8
khelben diyAudio Member Join Date: Jun 2005 Location: oklahoma	ok, set up is <pc sound card- yamaha htr5240-main speakers-crown/peavey as sub> the yamaha has a sub output that i cant get to work __________________ fear profits man nothing


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3rd June 2005, 07:40 PM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	Hi khelben, I think you are mixing up a few things here. I haven't got a clue what the Max input 750W could be. The d150a has an output of 2 X 75W IIRC. Connecting the input of the crown to the output of a receiver is not a good idea. (You will burn things). Where are the Peavey's connected to? The Yamaha or the Crown? /Hugo

3rd June 2005, 08:13 PM	#7
djk diyAudio Member Join Date: Feb 2001 Location: USA	" max input 750 watts" Power factor on cap input filter is about 0.6 Thus the watts available to consume about 450W Amp will do 240W bridged at 8 ohms Efficency is thus about 53%, about right for a class AB amplifier with an unregulated supply. With a regulated supply the theoretical efficency of a class AB amplifier is 78.5%

3rd June 2005, 08:28 PM	#9
Netlist diyAudio Moderator Join Date: Jan 2003	The sub output will only work in surround mode, not in normal stereo mode methinks. /Hugo

3rd June 2005, 08:45 PM	#10
khelben diyAudio Member Join Date: Jun 2005 Location: oklahoma	so how best , easy way to connect crown/peavey to system? (yes noob here) __________________ fear profits man nothing

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