question-circle Voltage drop vrs amplifier output

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GDHAL Posted 2 years 11 months ago
#21258

Outlaw#9 wrote: Thanks for your response, I would assume as voltage drops amperage draw is also up. I don't notice a loss in sound quality. I will with confidence drive it to the limit. I assume I'm not even getting close to the 380 plus RMS watts I can deliver to the T1. I don't expect to get there either just want awesome sound at concert like volume at times... thank you for your responses.


You're very welcome. And yes, I think you can get concert level volume (100+ db) without any issues.
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charliehatch Posted 2 years 10 months ago
#21262

GDHAL wrote: Most electronic equipment has a wide enough range of voltage it can safely operate within. But you are stating that when you raise your amplifier volume the voltage is dropping. That seems a bit odd. What should happen, as far as I know, is that the voltage remains constant but the *amperage* draw is increased as you raise volume. Perhaps you should double check your measurements and/or the way you are reading them.


On voltage drop, I did some tests when I had my T1 speakers. I installed a Kill A Watt meter in line with the system and measured the voltage with relatively no load. Then I cranked up the volume with some low frequency pipe organ content to a pretty loud level. I found that the voltage did drop and system load demand went up. It didn't drop a lot, just a volt or so, but it was there.

This can happen when there is an upstream resistance in the electrical line. Even though this is a 20 A circuit, it is daisy chained across several outlets on the way to my system outlet. (I really should get this fixed by installing a dedicated line.) As current increases, so does voltage drop by Ohm's Law.

That said, I agree with GDHAL that this small a change should not have a bad effect on the sound of the system. I couldn't notice a difference.

Charlie
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Outlaw#9 Posted 2 years 10 months ago
#21264
It is not a significant drop and it doesn’t bounce. And yeas its measured with no load then load and Im dropping 2 volts. Havent jammed out to see if it falls further. Likely wont cause trouble as many have said.
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GDHAL Posted 2 years 10 months ago
Last edit: 2 years 10 months ago by GDHAL. info_outline
#21267
I'm no electrical engineer, but I do know a little bit about electronics as I do have some formal vocational high school (Thomas Edison) credits and studied for 4 semesters. Power equals voltage multiplied by amperage. In the case of audio amplifiers, the voltage *should* (ideally, doesn't mean it will)) remain constant. When you raise the volume on your amplifier, you are asking it to deliver more power (wattage). Hence, the amperage should increase. I grant you that if you are finding that the voltage is dropping, regardless of how little, this will mean that to maintain the *same* wattage you will need to draw more current. But because you are raising volume, you are wanting more wattage. So if your voltage is in fact dropping then you will be drawing even more current than had your voltage remained constant. Note that certain audiophiles do use voltage regulators which are meant to stabilize (make constant) the voltage.
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charliehatch Posted 2 years 10 months ago
#21270
Hey Outlaw#9,

One thing you can do if you haven't already is replace your standard electrical outlets with 20 A hospital grade. You can get these from Amazon for about $13. smile.amazon.com/Leviton-8300-W-125-Volt...+grade+outlet+20+amp

I had measured a larger drop on an outlet, and I thought it might be due to a bad connection between the plug and the outlet. Hospital grade outlets grip the plug very tightly and make a better connection. After I installed a hospital grade outlet, things were better. So I installed them on all three of my equipment feed outlets.

You can spend a lot more money on unobtainium coated, cryo treated and all that. I'm not convinced those would make a difference.

There's a clever article here about how to install them:
www.stereophile.com/artdudleylistening/1...#jRUqzLi0eb44tb1p.97

Charlie
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HTSME Posted 2 years 10 months ago
#21276
Hi Outlaw#9. A couple of comments for you to consider. I see one of the members beat me to the punch regarding a hospital grade outlet. And yes it does make a difference. I got mine on Amazon as well 4 years ago and it cost me $20. Typically you see them from $15 to $50.

I also had certified Electrician run a dedicated 20 amp line to the wall behind my audio cabinet. The Electrician said they do about one a month in this area for audio or home theater systems, so it was not an unusual request. What was unusual was I gave him the outlet, 20 amp, hospital grade and he looked it over and said it was a good unit. A lot of the ones they install people stay with the $0.75 standard outlet. He was impressed with the brass mechanism that hold onto the male plug. Good "bite" on the male plug.

I run a big amp that is rated at 250 watts per channel at 8 ohms and even more at 4 ohms. Plus I wanted the dedicated line with nothing else on the line for minimum noise level. In my opinion it was worth the material and labor cost, especially when I saw how he got the cable to the location I wanted.

Finally I don't have a power line conditioner but have talked to 3 audio salesman and they tell me some affect the quality of the sound and some do not. The better ones run from $200 to $500 and even more. Isotek is a good one and I need to do some digging to get the names of the other ones that do not affect sound quality.

Del
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