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Do two 6" woofers = one 12" woofer ?

I remember a guy in college who DIY'ed a line-array (really, a stacked array) of 8-inch speakers. Like 12 speakers phased arrayed per channel. Actually sounded pretty good. But, he needed a lot of power to drive them. Like two big SAE amps.

They had excellent, tight bass. I believe that he was a drummer, too. :)
 
I remember a guy in college who DIY'ed a line-array (really, a stacked array) of 8-inch speakers. Like 12 speakers phased arrayed per channel. Actually sounded pretty good. But, he needed a lot of power to drive them. Like two big SAE amps.

They had excellent, tight bass. I believe that he was a drummer, too. :)

Even in this configuration the windows didn't rattle. This experiment only lasted a few minutes, it was only for shits and giggles. I had just purchased The Rock and wanted to give it a test run so pulled my second pair of Heresys out of the bedroom and two Kenny amps to drive all of them
20150506_174331.jpg
 
Yeah, I can get parts of the house vibrating in sympathetic motion, with certain bass notes or kick drum passages. I'm kinda used to it. My Fender Twin Reverb can make the joists in the attic start moving, if I wanted to. And that's with an electric guitar --- I can't imagine what a bass amp and bass could do. You feel the waves, but can't really hear them, kinda loud.

You have this tune? Herbie Flowers use of acoustic double bass and electric bass is awesome. If I crank it, metal things around the house start buzzing and dust starts coming off the ceiling. :thumbsup:

Subs on.
Off Lou Reed's - "Transformer." RCA Records. LSP-4807. Indianapolis pressing. DYNAFLEX. 1972.
Run-out: RCA BPRS 7038 93 -I
 
Yeah, I can get parts of the house vibrating in sympathetic motion, with certain bass notes or kick drum passages. I'm kinda used to it. My Fender Twin Reverb can make the joists in the attic start moving, if I wanted to. And that's with an electric guitar --- I can't imagine what a bass amp and bass could do. You feel the waves, but can't really hear them, kinda loud.

You have this tune? Herbie Flowers use of acoustic double bass and electric bass is awesome. If I crank it, metal things around the house start buzzing and dust starts coming off the ceiling. :thumbsup:

Subs on.
Off Lou Reed's - "Transformer." RCA Records. LSP-4807. Indianapolis pressing. DYNAFLEX. 1972.
Run-out: RCA BPRS 7038 93 -I

I do not but I'll be looking for it later, hope it's available on vinyl.
 
Also very important that both speakers are an exact electrical match (inductance, resistance, and Q). If not transient response will suffer.
 
When you have something to back up your conjecture then post it.

Here's a review of the BP10 measured response 25hz - 20khz +/-3.5db and it's only the BP20's little brother. The Dayton Audio Sub 1200 is rated to 25hz no parameters given. This is definitely subwoofer territory.

Excerpt:
"The overall response variation was only ±3.5 dB from 25 to 20,000 Hz. Even at 20 Hz, the output was down a mere 5 or 6 dB from the average level at higher frequencies." "The two small woofers not only reached down to the lowest musical frequencies, but they did so with surprisingly low distortion."
Im not going to continue arguing with someone that compares bass with rattling glass windows. :rolleyes: Talk about conjecture. :rflmao:
 
Why the ad-hominem attack?

Regards,
Gordon.
So any review that doesn't agree with you is suspect, I get it lol. So find any review that does.

I own two pair of Heresys, if you can get them to rattle thick storefront plate glass windows in a 2500 sq' store I sure would like to see it eh.
He seems to be claiming that subjective consumer reviews in audio are factual and or it proves his point.

He has also mentioned glass rattling windows over 3 times already as if that proves his arguments.
 
Regards,
Gordon.
Gordon I forgot to mention that you can also shape the cabinet to the size of the drivers for better baffle imaging.

Like these super $$$$ expensive Goebel speakers.


Also you would need a forklift to move these speakers. :rflmao:
 
Gordon I forgot to mention that you can also shape the cabinet to the size of the drivers for better baffle imaging.

Like these super $$$$ expensive Goebel speakers.


Also you would need a forklift to move these speakers. :rflmao:

That works- but it's usually only something that a designer can afford to do, for super-expensive speakers. That kind of cabinet complexity is astronomically expensive. I found that out, the hard way, when designing a speaker system about 15 years ago- those type of odd angles and cabinet facets, exponentially increases construction costs.

For less expensive speakers- the approach of using a vertical line of smaller drivers- on a more normal rectangular cabinet, with a narrow baffle- is the cost-effective choice.

Regards,
Gordon.
 
Another speaker that comes to mind is YG Acoustics.

It seems that speaker is using 2 separate cabinets one for the mid/bass to high frequencies and one for the low end. Similar to how one would place there main speakers right on top of a L/R pair of subwoofers.

 
I find this with a pair off old Polk's I have. Two 6" drivers mounted horizontally. They sound like the music is wider coming from further out the sides if the speaker with the image still between the speakers. A lot of my other speakers don't do that.
Drivers mounted horizontally usually have a wider soundstage. This is why center channel speakers are placed horizontally.

I think we have to clarify the difference between "soundstage" and "imaging". Soundstage is about the distance like width, depth and height. Imaging is about direction and separation as it refers to the ability of said audio gear to place and position individual sounds/instruments accurately within that soundstage.
 
No, they are placed horizontally so they will fit under a TV. In fact, all the better ones put the mid and tweeter vertically in the center.
If that was the case then they would only use 1 woofer with the mid/tweet. Two woofers placed horizontally increase dispersion/soundstage for a wider sweet spot.

Also that is not the reason for the tweeter and the mid aligned vertically.
 
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If that was the case then they would only use 1 woofer with the mid/tweet. Two woofers placed horizontally increase dispersion/soundstage for a wider sweet spot.
I'm sorry, but placing 2 of the same drivers horizontally causes comb filtering above a certain frequency and actually harms soundstage reproduction. Like sregor said, in a center channel, you need to reduce the height of the cabinet to fit above or below a TV. There are only a few options - one being to place the tweeter in between 2 mid-bass drivers. That causes dispersion anomalies as frequency rises toward the crossover point. It's just physics at work. Some of the more honest manufacturers will publish specs that give the expected horizontal dispersion of their center channels and how many sets they will cover at a given distance. Hint - it's much narrower than their vertically oriented L/R speakers.

FWIW - I've been involved in DIY speaker design community for over two decades. We just had an annual pilgrimage/show and tell this past weekend. I'm not a great designer, but I can build something that sounds pretty decent. Now a few of these guys can design stunningly good speakers and even do the design work for speaker manufacturers. You can see some of the event photos here - https://diy.midwestaudio.club/discussion/2275/iowa-diy-2023/p7
 
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