Measuring Amplifiers - Page 36

I was gonna suggest that, two for the price of one . . . . . or something.

Hey Ear,
I forget what other amps you have but since Chuck found an issue with the XTi 1000 and you have just done an unofficial test of your own on the 2000 and 4000, do you now think the 1000 tested by Chuck was an anomaly?
Also if you have other amps how do the XTis compare with those for power in a listening test?

I missed that post from TheEar, its great to hear that the Xti products do well. TundrSQ already posted he was happy with his amp and I still have the Dayton 1000W amp in use so measurements doesn't always dictate performance and Im cool with that!

It also proves that we dont really need HUGE measured Watts to produce insane SPL....I seldom actually do 110dB these days

How much power (watts) do we actually need? Good question. Some say you need gobs and gobs and never have enough headroom. But really how often are we even allowed to crank it up with neighbors and family always being the limiting factor. I myself play loud but I don't think I have the sub over 105db and then that's only when I'm into some of the baddest DVDs. My opinion . . . . . around a 1000 watts of good clean power is enough including those times when there are cannons or earthquakes or Clingons or even synthesizers to reproduce. I don't want to be called "Insane in the membrane".

penngray, with a 16hz tuning, that rolloff does NOT seem natural, it is way too steep.


As much as you are willing to pay for. You still want gobs of power, but you don't need it in the form of a continuous sine wave, you need it in short bursts.

Anomaly...no I think these amps weak point is sustained output below ~50Hz.

On short bursts they do much better. I did not sense a weakness driving TC3000 and LMS-Ultra sealed,I did not push the drivers or amps that much.

A normal user will not complain of a performance issue,tests push amps much harder than anyone here will.

I love the different replies for "how much power do we need?"

How about 'whatever your drivers need'

If you have a single ported 12 you wont need what you'll need with quad 18s in a small sealed box...

What about Klingon synthesizers during an earthquake?

With an effective ported 50W may be used ,in a compact sealed 1KW may not be enough to reach the same SPL.

I need a truck load of 15 and 18" drivers and a second truck with amps.

Just to be on the safe side when playing some pathetic low rent block buster hoopla loaded trash a ton.

really, -3 dB at 16 Hz is what WinISD says and that chart shows the same plot, doesnt it?

How about the 36db drop in less than one octave below tuning?

Has anyone reviewed the Dayton 1000w rack amp? I just got my dad one for a great deal on ebay from Parts Express. I had an "extra" velodyne SC12 that he is going to use with it in a vacation home. Any opinions on the Dayton 1000w Rack amp?

Scroll down a couple posts.


Or don't , if you're happy with it.....

http://www.avsforum.com/avs-vb/showt...9#post13714349

INteresting, so 450w @ 8 ohms and 580w @ 4 ohms? I have not even hooked it up yet, but since the driver he is using is an 8 ohm, it is rated at about 500w there, and it looks like it only puts out 450w, not too bad. Wonder why it doesn't produce more power in 4 ohms?

Interesting in that thread regarding the Dayton, people praising Bob Carver. I have always thought of Bob Carver as a Mid-Fi company, when his super high rated amps and subs came out, they were ALL the hype, with mid-fi shops. The super high end guys would tell you to go pick up the Carver amp and pick up the Levinson, Krell, or McIntosh amp at the same power, and say "you tell me if that is a true ......watts". I have never felt like Bob Carver stuff was the pinnacle of audio amplification, even though that it is rep amoung mid-fi groupies.

That's quite a list of amps Chuck. I'd be interested in seeing the test results of your modded Hafler, I've got the Hafler 280K that I had used bridged.

Excellent! We're all going to become as thoroughly knowledgeable about amp stats as you and thylantr! LOL NOT!

Yeah, its very weird...Im using it @ 8 ohms so its not a big deal to me.

Now thats some $$$!!!

Do you believe that these are better amps then the lower end amps like Outlaw or Emotiva? I wonder what the tests show.

AVS forum is still in the dark ages. Links to threads eventually go dead
as AVS archives their data. You might want to complile your data
into a simple document and host it elsewhere

Interesting. I just reviewed the links to all the different amps, amazing that some can be sooooo overrated. I would think that they might be a bit overrated, but nothing more than +/- 10% of claimed power.

I guess my velodyne is a pretty decent amp after all (I knew it had the power section that is used on the highly touted 18" sealed DD18).

I got to thinking, and this is a basic question that I should understand, if it produces approx 1000w in 4 ohms, and I am running 2 drivers and the amp is seeing 4 ohms, does this mean that EACH driver gets 1/2 that power at 500W or each driver gets 1000w? Like a said, a basic question that at one time I knew, but for some reason I forgot.

Thanks

Sometimes it's best to forget because if you remember but incorrectly you're gonna end up in a squabble with another poster over some insignificant unimportant detail. Just take those things you remember best and be happy, kiss your wife once in a while and call it a day.

LOL. Thanks

So what is the answer, does each driver get 500w or 1000w??

Fortunately I believe google can dig out the archives (as well as audioasylum's), i tried that before. I found some info from you as far back as 2002.

500w

I've attached the posted graph with what's happening to the response after the room's influence vs an ideal 4th order roll off with an F3 of 16Hz.

It looks like there is some room gain around tune and a null (or signal chain roll off) just above 10Hz. Every room I've ever measured has room gain below 10Hz. When the measurement is expanded to below 10Hz, there is always a bump of some size, regardless of how far down the subwoofer has rolled off by then.

Bosso

Each driver will get 500W....make sure your total ohms is 4 and not 2!!