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Post by AudioHTIT on Oct 11, 2017 20:58:45 GMT -5
I agree, we have a good start on Emotiva Amps above, but it would be nice to fill out the list with as many Emo products as possible. It’s great to have other gear as well, and if you’re going to the trouble of measuring your amp then why not get as much as possible at the same time. Edit: I should add that getting peak power will be difficult and hard to reproduce, it also might encourage someone to push their system beyond what’s safe and damage something (most likely their speakers). Unless someone knows an easy and safe way to get peak power with a K-O-W, I’d recommend we stick to idle power.
I've been thinking about that. the K-O-W is not a 'fast' enough meter to catch and hold peaks. So the next best thing would be test tones. Lots of power will fry a tweeter, especially if applied for too long, to keeping the tone to maybe 1khz will help. And for no longer then it takes to get the data. Say 15 seconds or so. And <5 seconds at higher powers. Give tweeter time to COOL between tests of this nature. The data I'd want to see would be: 1. Line Voltage @idle and during test. This will kind of show how 'stiff' the power line is. 2. Idle and during test 'Watts'. and 3. Power Factor. This will show how reactive the power supply is and allow calculation of VA vs Watts. As for 'Maximum' or 'Peak' power? I'd never ask or recommend turning it 'up' drastically with test tones. It might be a good idea to have an SPL meter standing by. I've seen Smart Phone apps, but don't know how repeatable or accurate they are. Speakers aren't designed for sustained test tones. Testers use 'tone burst' techniques which limit test time to very short intervals. The BEST way to determine peak power draw would be to hook the amp up to a Dummy Load, skipping the speaker part. Worst case here is heating up your room, but of course, you COULD pop a fuse or otherwise damage your amp. I’d thought about including voltage as well, mine is usually on the high side, averaging 124V; including it might also yield some interesting results from our ‘offshore’ friends. I was also thinking about one thing that was along the lines of Gary’s original recommendation. Those who want an additional challenge, and who have test tones and a VOM, could (softly) play some pink noise while monitoring the AC voltage across the speaker terminals. They then increase the volume until they get a reading of 2.83V (the standard value for 1W), they then take a power reading. We could use this to calculate efficiency at 1W, and at that low power not risk damage. For anyone reading along, don’t let these extra readings discourage you from taking the basic idle power value, if you’re unsure how: 1) plug the amp or other device into the K-O-W 2) turn on the power without applying any signal (turn the volume all the way down) 3) Wait a while for the device to stabilize, at least 5 min, preferably 10-20 min. 4) Take a Wattage reading on the KOW 5) For extra credit take a voltage and power factor reading at the same time 6) Post the Make, Model, and readings in this thread. |
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Post by leonski on Oct 11, 2017 22:40:18 GMT -5
1 watt won't speak to ultimate efficiency of amp or really tell you much at all. That will be just above the 'housekeeping' power of the amp.
I don't know if a regular DVM will give you a proper voltage reading and I'd even be wary of a 'true RMS' meter.
Unfortunately, at some point, we get to the area where a good data capture SCOPE will be needed.
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Post by AudioHTIT on Oct 12, 2017 11:02:37 GMT -5
I decided to move the data to another thread for better visibility and to encourage submittions from more Loungers! Post your results in this thread: emotivalounge.proboards.com/post/911602/threadPlease continue the discussion on efficiency and idle here, the other thread is just for measurements.  |
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stiehl11
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Post by stiehl11 on Oct 18, 2017 15:41:31 GMT -5
So, I just got a Raspberry Pi to use as a music server (like what Mark did) and I'm wondering how efficient it is? Will I need to change/add a 20 amp circuit with my DC-1/BasX A-100, powered sub, if I add it to that?
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hemster
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Post by hemster on Oct 18, 2017 16:40:28 GMT -5
So, I just got a Raspberry Pi to use as a music server (like what Mark did) and I'm wondering how efficient it is? Will I need to change/add a 20 amp circuit with my DC-1/BasX A-100, powered sub, if I add it to that? Don't forget to feed it an organic, clean, no artificial flavoring or additives, non-GMO diet of 20 amps. |
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klinemj
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Post by klinemj on Oct 18, 2017 20:37:20 GMT -5
So, I just got a Raspberry Pi to use as a music server (like what Mark did) and I'm wondering how efficient it is? Will I need to change/add a 20 amp circuit with my DC-1/BasX A-100, powered sub, if I add it to that? How much do you weigh? The power required of a Pi is directly proportional to your weight. There are different formulas for weight in kilograms vs. pounds vs ounces. I'll try to search the world-wide-interweb to see if I can find the base formula and conversion factors. Mark |
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Post by Gary Cook on Oct 18, 2017 23:29:45 GMT -5
How much do you weigh? The power required of a Pi is directly proportional to your weight. There are different formulas for weight in kilograms vs. pounds vs ounces. I'll try to search the world-wide-interweb to see if I can find the base formula and conversion factors. Mark I've tried all the formulas Mark, and they are all wrong, I don't weigh that much.  Cheers Gary |
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stiehl11
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Post by stiehl11 on Oct 19, 2017 10:07:51 GMT -5
So, I just got a Raspberry Pi to use as a music server (like what Mark did) and I'm wondering how efficient it is? Will I need to change/add a 20 amp circuit with my DC-1/BasX A-100, powered sub, if I add it to that? Don't forget to feed it an organic, clean, no artificial flavoring or additives, non-GMO diet of 20 amps. I've been feeding it some Southern-fried TVA power; do you think I should put it on a diet? |
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stiehl11
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Post by stiehl11 on Oct 19, 2017 10:08:44 GMT -5
So, I just got a Raspberry Pi to use as a music server (like what Mark did) and I'm wondering how efficient it is? Will I need to change/add a 20 amp circuit with my DC-1/BasX A-100, powered sub, if I add it to that? How much do you weigh? The power required of a Pi is directly proportional to your weight. There are different formulas for weight in kilograms vs. pounds vs ounces. I'll try to search the world-wide-interweb to see if I can find the base formula and conversion factors. Mark A gentleman never tells.  |
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hemster
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Post by hemster on Oct 19, 2017 17:43:44 GMT -5
Don't forget to feed it an organic, clean, no artificial flavoring or additives, non-GMO diet of 20 amps. I've been feeding it some Southern-fried TVA power; do you think I should put it on a diet? Yup. Nothing but a vegan/vegetarian diet will guarantee no burps, rumbles, gurgles. (Ok, maybe not guarantee on that diet!). You'll be regular as clockwork! ![]() |
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Post by Gary Cook on Oct 19, 2017 20:16:01 GMT -5
Yup. Nothing but a vegan/vegetarian diet will guarantee no burps, rumbles, gurgles. Not for me, after a cucumber, cauliflower and broccoli salad I need a trip to the bank ..................  Cheers Gary |
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