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Author Topic: Headphones as good as $40K speaker systems for a fraction of? BULLSHIT!  (Read 15664 times)

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Marvey

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Re: Headphones as good as $40K speaker systems for a fraction of? BULLSHIT!
« Reply #70 on: March 07, 2013, 04:34:03 PM »

I can't stand full range drivers, the tonal colorations (you invariably get breakup modes right where it hurts (1-5kHz) range. You might like that better than headphones, I think it's just the change of flavor that is attracting you and it will sooner or later get old.



http://www.changstar.com/index.php/topic,833.msg20484.html#msg20484
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DS-21

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Re: Headphones as good as $40K speaker systems for a fraction of? BULLSHIT!
« Reply #71 on: March 07, 2013, 04:39:22 PM »

Any home audio system that does not employ multiple subwoofers and suitable EQ based on in-situ measurements is a low-fidelity system. Period. Doesn't matter if the speakers are some cheap full-range deal or TAD Model Ones.

I was with you right up until that - which is a big pile of horseshit. Stereo subs are almost universally better than a single one, but even two subs can often introduce as many problems as they solve when it comes to integration and timing.

It's "horseshit" when we agree that one sub (remember, I wrote "multisubs + EQ") is bad idea?

But two is usually not much better than one, especially if one is highpassing the mains rather than letting them run. (One reason I much prefer closed box mains to any kind of 4th-or-more order system is that the mains stay monopole, rather than going dipole and unloading below box tuning.) Three is a useful minimum in a room with good LF damping (false lossy walls and such, not pre-packaged room mutilation products shoved against the walls) and mains playing down to the first-mode region (50Hz or so). I'm actually using 5 right now, though two are stands for the mains with and play significantly higher to smooth out the floor-bounce region ("Allison effect"). Alternately, one could think of the setup as two full-range biamped mains and three randomly-distributed subs, all controlled from a miniDSP 10x10HD.

The exception is a nearfield setup. Generally, one can get pretty good bass with one sub and thoughtful EQ. It does fall apart if one moves one's chair a foot, true, because MSV is going to be very high in any system with only one subwoofer. But in a nearfield setup imaging collapses with lateral movement too, so that's just a price to pay for good sound in one spot.

As for integration, that is correct. One needs some skill in integrating them, and the patience to suffer through sometimes seemingly endless tedious measure-adjust something (gain, delays, EQ, etc)-measure loops. I wish there were publicly-available software packages to help, but there aren't. Harman's SFM is not available, and Geddes won't run his software (AFAIK) for people who don't buy his subs.

As for "timing," consider the wavelengths involved, and typical small room dimensions. The science is fairly settled that we don't perceive "timing" down low. We perceive the steady-state frequency response. "Timing" errors in the bass are usually just FR anomalies caused by poor integration. Unfortunately, most of the automated tools out there, because they ping mains and subs separately rather than doing a combined sweep, integrate subs and mains poorly. (Trinnov is the only system that I've ever heard get it right automatically. Even ARC requires post-facto fixes, though it's substantially better than Audyssey.)

You can get extremely even, extremely balanced bass response without subwoofers or active EQ, you just need to use targeted bass traps like GIK's Scopus Tuned models instead of broadband absorbers.

That has never been my experi ence, except in very, very large rooms.

Also, "Bass traps" are usually too small to do much. A real bass trap is a whole lossy wall, with constrained layer damping. I don't care what brand they are, mind. I care what they do. A good rule of thumb for "bass traps" is that if you can buy them and fairly easily transport them, they're going to be minimally effective in the modal region and below. As your own measurements above show, with a modal region (say, 50-200Hz, though the upper and lower bounds vary with room volume) FR swing of about 13-15dB more than I'd consider "high fidelity."
« Last Edit: March 07, 2013, 05:13:53 PM by DS-21 »
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Marvey

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Re: Headphones as good as $40K speaker systems for a fraction of? BULLSHIT!
« Reply #72 on: March 07, 2013, 04:50:29 PM »

Now you are tempting me with three or more subs. It's good to know of someone who has done it successfully. (I've only read papers, and these were from 10 years ago.) I do find the "endless tedious measure-adjust something measure loops" much more fun than agonizing over which new headphone or portable DAC/amp combination to upgrade or sidegrade to.
« Last Edit: March 07, 2013, 05:04:12 PM by purrin »
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DS-21

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Re: Headphones as good as $40K speaker systems for a fraction of? BULLSHIT!
« Reply #73 on: March 07, 2013, 05:02:05 PM »

Now you are tempting me with three or more subs. It's good to know of someone who has done it successfully. (I've only read papers, and these were from 10 years ago.) I do find the "endless tedious measure-adjust something measure loops" much more fun than agonizing over which new headphone or portable DAC/amp combination to upgrade or sidegrade to.

I don't know if it's kosher to post links to other sources here after my blog thing, but you can find more information by searching under the terms "modest multisub system" for an AVS thread about decent result in a temporary apartment setup using three small subs, and also searching for some of Dr. Earl Geddes' stuff on multisubs. Geddes' approach differs from the Harman (Welti/Devantier) approach because his first priority is smooth FR at the listening position with MSV second, whereas Harman's optimization prioritizes minimal MSV with the presumption that the summed low-variation response can be EQ'ed to taste.

I'll have more and better - a fair critique of what I've posted earlier is that the MIC-5/SMS-1 I was using for measurement at the time* is a highly smoothed measurement - measurements on my current/new system up when I, um, finish setting it up. And even then, it won't be "done" because I'm getting new sub cabinets made for two of my five subs for aesthetic reasons. I may also turn my side-surround speaker stands into subwoofers, because I have the DSP and amp channels available to do so without adding new electronics boxes. That should further lower MSV, but bespoke cabinetry is expensive and I haven't yet decided if that's important enough to throw a couple more grand at.

*The SMS-1 is not in the signal chain except for as a source in the "modest multisub" measurements, so ignore any EQ. It WAS in the chain for the above graph. That is the response of three subs with only gain optimization. No EQ at all. That room was, however, just about perfect for bass. Each wall pair (front/back, floor/ceiling, side/side had one wall that was very lossy, and one that was very rigid (brick or concrete). I've never subsequently had a room that well-optimized for bass reproduction. Also, as an unmarried grad student at the time I had extraordinarily wide latitude as to subwoofer placement.
« Last Edit: March 07, 2013, 05:18:06 PM by DS-21 »
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shipsupt

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Re: Headphones as good as $40K speaker systems for a fraction of? BULLSHIT!
« Reply #74 on: March 07, 2013, 05:03:23 PM »

Links are fine... especially when they are for the benefit of the muggles.
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Yeah, well, you know, that's just, like, your opinion, man.

Marvey

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Re: Headphones as good as $40K speaker systems for a fraction of? BULLSHIT!
« Reply #75 on: March 07, 2013, 05:08:38 PM »

I don't know if it's kosher to post links to other sources here after my blog thing, but you can find more information by searching under the terms "modest multisub system" for an AVS thread about decent result in a temporary apartment setup using three small subs, and also searching for some of Dr. Earl Geddes' stuff on multisubs.

It's fine. I was giving you a hard time when you first signed up. This site is getting more popular and we are getting more and more weirdos signing up. But then again, we are probably a bunch of raving lunatics ourselves.
« Last Edit: March 07, 2013, 05:47:10 PM by purrin »
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DaveBSC

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Re: Headphones as good as $40K speaker systems for a fraction of? BULLSHIT!
« Reply #76 on: March 07, 2013, 05:31:47 PM »

Also, "Bass traps" are usually too small to do much. A real bass trap is a whole lossy wall, with constrained layer damping. I don't care what brand they are, mind. I care what they do. A good rule of thumb for "bass traps" is that if you can buy them and fairly easily transport them, they're going to be minimally effective in the modal region and below. As your own measurements above show, with a modal region (say, 50-200Hz, though the upper and lower bounds vary with room volume) FR swing of about 13-15dB more than I'd consider "high fidelity."

Saying "your system sounds like crap unless it's stuffed full of subs and uses active EQ" is just as much bullshit as the title of this thread. The first measurements were done in a mostly empty, untreated space, and the last ones were done without any targeted bass trapping like the Scopus or Vicoustic's Varibass. In my experience, by far the most problematic frequencies in rooms are in the 50-70Hz region, which is exactly what Varibass goes after. Below that, the Scopus T40 has a center target frequency of 40Hz, though GIK can custom make one to target the exact frequency where the problem is. Obviously when you get below 35Hz waves become exponentially longer and harder to control, although for what I listen to, the need to be perfectly flat from 25Hz-35Hz and the big pile of subwoofers and EQ that would be necessary to achieve that response is questionable at best.

Plenty of people are happy with monitors where output much below 45Hz is basically non existent. I'm not going to tell them that they are listening to a "low fidelity" system.
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Marvey

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Re: Headphones as good as $40K speaker systems for a fraction of? BULLSHIT!
« Reply #77 on: March 07, 2013, 06:05:59 PM »

Also, as an unmarried grad student at the time I had extraordinarily wide latitude as to subwoofer placement.

Yeah, I know what you mean. I used big futons (flat on wall or rolled up in a corner) as bass traps once upon a time. I'm sure my wife wouldn't allow such anymore.
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DS-21

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Re: Headphones as good as $40K speaker systems for a fraction of? BULLSHIT!
« Reply #78 on: March 07, 2013, 06:18:18 PM »

Saying "your system sounds like crap unless it's stuffed full of subs and uses active EQ" is just as much bullshit as the title of this thread.

As before, you seem to be replying to something other than the text I actually wrote. Something can be "low fidelity" but subjectively enjoyable.

SThe first measurements were done in a mostly empty, untreated space, and the last ones were done without any targeted bass trapping like the Scopus or Vicoustic's Varibass. In my experience, by far the most problematic frequencies in rooms are in the 50-70Hz region, which is exactly what Varibass goes after.

How long are those wavelengths? How big are the name-brand baubles you are using to manipulate them?

The answers are, respectively, more or less "very long" and "not big enough," if you were curious.

Below that, the Scopus T40 has a center target frequency of 40Hz,

Name brands and model names of products don't really matter. Audio is full of products with lots of hype and either little substance or promises that are physically impossible. The "room treatment" (or as I prefer to call it, "room mutilation" because the products are uniformly ugly to behold) sub-industry is no different. All those devices seem to be passive. If they were active devices, they could do something useful at that size. Anyone who's set up multiple subwoofers has observed that at some frequency ranges an active subwoofer actually acts as a sink, lowering the overall energy in the room at that range. Perhaps there is interesting work to do on active bass absorption, though that would still leave the MSV problem unaddressed for those who care about more than one seat.

Obviously when you get below 35Hz waves become exponentially longer and harder to control, although for what I listen to, the need to be perfectly flat from 25Hz-35Hz and the big pile of subwoofers and EQ that would be necessary to achieve that response is questionable at best.

The "big pile" of subwoofers (interesting metaphor but factually incorrect, because to be useful the multiple subwoofers need to be distributed around the room as far away from one another as practiceable; if they are in a "big pile" they sum to effectively one subwoofer) is deployed not to smooth response in the first-mode region (below about 40-50Hz in a "small room"). The first-mode region is best addressed with global EQ for all subs, because the modes are so sparse.

Multisubs only help where the modes are dense enough that they can be excited randomly to smooth out their overall impact, i.e. in the "modal region."

I do, incidentally, share your opinion about the importance of flat-line bass in the first mode region. The reason is simply that just-noticeable difference s in sub-bass are much larger than they are an octave or two up. So honestly I do wonder if lots of EQ down low is just to make the person feel better about having a nice graph. If that nice graph is attained by applying lots of boost, it may actually be deleterious because it could rob the bass subsystem of significant power headroom.

Plenty of people are happy with monitors where output much below 45Hz is basically non existent. I'm not going to tell them that they are listening to a "low fidelity" system.

"Happiness" is, of course, out of the scope of "fidelity." People are happy with all sorts of things.
« Last Edit: March 07, 2013, 06:29:11 PM by DS-21 »
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DS-21

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Re: Headphones as good as $40K speaker systems for a fraction of? BULLSHIT!
« Reply #79 on: March 07, 2013, 06:50:38 PM »

Links are fine... especially when they are for the benefit of the muggles.

Well, then:

Two Geddes papers with commentary (linked to my blog rather than his forum, because accessing them on his forum requires registration):. http://seriousaudioblog.blogspot.com/2012/05/two-great-articles-on-multiple.html

Recent talk by Geddes to his local audio club on multisubs (technical difficulties make it hard to follow at times): http://www.ustream.tv/recorded/28637776/highlight/319149

Powerpoint from above presentation: http://www.gedlee.com/downloads/Optimal%20Bass%20Playback%20in%20Small%20Rooms.pptx

Modest multisub thread on AVS that illustrates the sequential calibration process, with some discussion of Harman SFM in the thread: http://www.avsforum.com/t/1340062/measurements-of-a-modest-multisub-setup-in-a-temporary-rental-apartment/0_100
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