Tag Archives: tweeter

Asheville, Walnut Cove, Biltmore Forrest and Western North Carolina’s Audio and Home Theater specialists present Cane Creek AV and Paul McGowan – PS Audio, Intl.

Cover up

I was never quite sure why this was a thing back in the 60s but instead of guys taking showers my college classmates seemed to like the idea of applying cologne to cover up their stink. I can’t tell you how much I wound up detesting the stench of BO covered by Jade East.

My view has always been a simple one. Fixing the problem is always preferable to covering it up, though that’s not always so easy. A bright tweeter can be tamed by any number of cover-ups which might make more economic sense than replacing a pair of speakers.

But, the core of the problem remains and it’s a tough discipline to instill in one’s self. Whenever I hear a system trapped in the speakers I first turn to setup. If setup doesn’t release the sound from the speaker’s grip we work ourselves back through the chain to find the culprit rather than start the great cover-up.

Quick fixes are always easier but usually less effective. This is one good reason I agree with my friend Bill Low of Audioquest in his mantra to do no harm. He and I both recoil at the idea of using audio cables as equalizers, yet sometimes there’s little choice if you can’t fix the core problem.

The first step in this process is as mentioned. Find the root cause of the problem. Once you’ve narrowed it to the culprit it’s ok to mask the problem until you can figure out the best way to fix it.

If only I could have handed a bar of soap to those classmates so many years ago.

 

Asheville, Walnut Cove, Biltmore Forrest and Western North Carolina’s Audio and Home Theater specialists present Cane Creek AV and Paul McGowan – PS Audio, Intl.

Line sources

Kevin in Wappinger Falls New York (wherever that is) asked me an interesting question recently.

“Arnie Nudell popularized the line source loudspeaker design and many of his most revered Infinity speakers such as the Quantum Line Source, the IRS 1B, the IRS V, and the Genesis 1 (and apparently at least the two larger members of your forthcoming AN series loudspeakers) are all line source designs. Why don’t we see more line source loudspeaker designs? Is it strictly due to the cost because of the many more drivers, the larger cabinet, the increased manufacturing labor cost – or are there other attributes that have made them less popular?”

This is a really good question and one we don’t talk about much. Perhaps it’s a good idea to first get on the same page. The classic two-way or three-way loudspeaker has two or three drivers in a box. The multiplicity of drivers—tweeter, midrange, woofer—is needed to break apart the frequencies so each driver only has to handle a specific range: tweeters handle the higher frequencies about 2kHz and the woofer handles everything from that point down.

A line source handles the frequency divisions in exactly the same way—tweeters, midrange, and woofers—but instead of relying upon a single driver for each range multiple drivers are instead employed, typically with a line of many tweeters and sometimes many midranges. The advantages of multiple drivers in a line are manifold: each driver has fewer demands and the waveform comes out in a long, vertical, cylinder rather than a single driver’s ever-expanding circular wave.

The advantages of a line source vs. a point source can be summed up fairly easily. A point source sound radiates in all directions from the driver and quickly loses energy as it floods the room in a 180˚ plane. Worse, this expanded radiation pattern hits the ceiling, walls, and floor and reflects back into the room out of synch (time) with the initial launch. Only those listeners in a narrow sweet spot get to enjoy the best sound. A line source radiates a more focused pattern in the shape of a tall vertical cylinder that, above about 500Hz, has nearly no floor, ceiling, or sidewall reflections to dissipate energy and add to sonic confusion.

All that said, tomorrow we’ll look at some older Infinity designs.