Open baffle 32-inch subwoofer?

0 Members and 1 Guest are viewing this topic. Read 1688 times.

Vasubandu

  • Jr. Member
  • Posts: 3
Open baffle 32-inch subwoofer?
« on: 17 Feb 2018, 09:16 pm »
I have an established Alibaba commercial account from a few past projects that gets me in with Chinese suppliers. The other day I was goofing off on Alibaba, and I noticed that a company was offering a 8000 watt RMS 32-inch subwoofer driver. The cost is$850 to $950 which would be plus shipping, and at 100 pounds, I am guessing that would mean something around $1,100 delivered. So I sent an inquiry about an evaluation pair, and they offered to send me 2 for $900 including shipping. Suddenly I had the potential for 2 32-inch drivers for $450 apiece.

This is the driver: https://www.alibaba.com/product-detail/16000-Watt-32-Inch-Subwoofer-PD32150B_60589689045.html

The company makes an extensive line of speaker products. Its profile is here https://nbfante.en.alibaba.com/


My questions are first whether anyone has an opinion whether it would make any sense to buy these, and second whether they could be used to make an open baffle subwoofer.  I am not sure what driver size would be required, so why not just do without a driver? Based on my reading, people really like the sound of open baffle subwoofers, but they drop off too much at low frequencies.  My thought was that perhaps a really large driver would drop off less.  And if it worked, maybe  that would lead to a full range open baffle speaker with a subwoofer.

If I did this, my preference would be to use some kind of wood slab.  I am a fan of exotic tropical wood slabs, and the idea of a beautiful finished slab of wood around 3-4 feet wide, 5-6 feet tall and 2-4 inches thick is attractive as long as would not interfere with acoustics.  It would have to be flat, but could be cut and shaped withing reason.

I have no experience with open baffle or full range speakers, but both appeal to me.  Any thoughts of any kind would be welcome.  :scratch:

dB Cooper

Re: Open baffle 32-inch subwoofer?
« Reply #1 on: 17 Feb 2018, 10:36 pm »
Wow. Electro-Voice used to make a 30" woofer  (before the term 'subwoofer' was invented) but I think they are long gone. 16KW sounds like fiction though.

Shakeydeal

Re: Open baffle 32-inch subwoofer?
« Reply #2 on: 18 Feb 2018, 03:06 am »
If you really want OB bass that will plumb the depths, get one of Danny Ritchies servo sub kits. Since you are still going to need a baffle and an amp for the 32" sub, this would probably not cost much more.


Shakey

Wind Chaser

Re: Open baffle 32-inch subwoofer?
« Reply #3 on: 18 Feb 2018, 03:26 am »
16KW sounds like fiction though.

I don't know db, it's got a 6" voice coil! I'd like to hear this driver, especially in OB. It would help if they published the T&S.

Russell Dawkins

Re: Open baffle 32-inch subwoofer?
« Reply #4 on: 18 Feb 2018, 07:25 am »
Looks like a bargain compared to the Fostex equivalent at $4000.
The Fostex is half the weight.
The specifications for the Chinese woofer are pretty skimpy—and what could they mean by listing a range of sensitivities from 96 - 101 dB? And what does the "Voltage DC 12V" refer to?

Pretty expensive experiment on your part, but could be worth it as a novelty.

FullRangeMan

  • Volunteer
  • Posts: 10302
  • All Tweeters look like a target, then shoot them!
    • Never go to a psychiatrist, adopt a straycat or dog. On the street they live only two years average.
Re: Open baffle 32-inch subwoofer?
« Reply #5 on: 18 Feb 2018, 09:11 am »
In the 1970s Tangerine Dream was the first band to use 30 inches woofers live, it was impressive for the time.

On Alibaba since 2006 I try to buy in this shop but his site have an error in the credit card fill that results rejecting my card, in lasts december I try again and these incompetent yet dont solve this fail.

There is no way to contact the Alibaba custumer service by the site, which not a good sign. There is a smaller 24 inches woofer also 12VDC.
https://nbfante.en.alibaba.com/product/60716703780-802784293/12000_Watt_24_Inch_Subwoofer_PD24127A.html?spm=a2700.8304367.prewdfa4cf.34.6b4b69ec0Jie1E

JLM

  • Full Member
  • Posts: 8484
  • The elephant normally IS the room
Re: Open baffle 32-inch subwoofer?
« Reply #6 on: 18 Feb 2018, 11:39 am »
Yes, without T/S parameters it's just a guess if best suited for a sealed, ported, or open cabinet.  Yeah, what's that 91-100 dB/w/m efficiency all about?  Probably intended for use in arenas.  Isn't a 15 inch driver big enough for your room?  Besides Floyd Toole, et. al. have shown that multiple subs provide better in-room results than one big subwoofer.  Years ago I over-bought woofers and they were constrained by any room I'd ever be able to afford, but sounded glorious in a 20,000 cubic foot chapel.

If Qts is high enough would a better candidate for infinite baffle versus huge open baffle(s).  Drivers that massive would need a correspondingly massive baffle to offset it's moving mass.  Infinite baffles are mounted to a wall (with at least 10 times the Vas of open space behind).  Care must be taken to avoid hinged doors in those spaces that could blow the drivers out.  Thought about using (4) 15 inch woofers in my dedicated room, but in the end decided to maintain flexibility. 

Wind Chaser

Re: Open baffle 32-inch subwoofer?
« Reply #7 on: 18 Feb 2018, 05:51 pm »
If you watch the video on the linked page, it appears they have taken detailed measurements, unless it’s just a page of something else being used as a prop?  :dunno:

Bob in St. Louis

  • Volunteer
  • Posts: 12902
  • "Introverted Basement Dwelling Troll"
Re: Open baffle 32-inch subwoofer?
« Reply #8 on: 18 Feb 2018, 06:58 pm »
It also says, "4 piece minimum order".  :o

Wind Chaser

Re: Open baffle 32-inch subwoofer?
« Reply #9 on: 18 Feb 2018, 08:27 pm »
That's because that multiple subs provide better in-room results than one woofer.  :thumb:

dB Cooper

Re: Open baffle 32-inch subwoofer?
« Reply #10 on: 18 Feb 2018, 09:01 pm »
I don't know db, it's got a 6" voice coil! I'd like to hear this driver, especially in OB. It would help if they published the T&S.

Visualize the amount of heat produced by a 1000W space heater. This would be multiples of that. There's no way. Maybe for a millisecond...

Bob in St. Louis

  • Volunteer
  • Posts: 12902
  • "Introverted Basement Dwelling Troll"
Re: Open baffle 32-inch subwoofer?
« Reply #11 on: 18 Feb 2018, 09:24 pm »
That's because that multiple subs provide better in-room results than one woofer.  :thumb:
Yes, I get that, but now it's a $4000 OB sub!  :lol:
....And is that whole "swarm" theology still correct for OB?

Tomy2Tone

Re: Open baffle 32-inch subwoofer?
« Reply #12 on: 18 Feb 2018, 09:44 pm »
Amazon has a 32” with free delivery but only one left!

https://www.amazon.com/DS18-TM-SN32-Troublemaker-Neodymium-Subwoofer/dp/B01HS8QJOM

FullRangeMan

  • Volunteer
  • Posts: 10302
  • All Tweeters look like a target, then shoot them!
    • Never go to a psychiatrist, adopt a straycat or dog. On the street they live only two years average.
Re: Open baffle 32-inch subwoofer?
« Reply #13 on: 18 Feb 2018, 10:37 pm »
1 ohm sub suited for automotive sound competition.

Bob in St. Louis

  • Volunteer
  • Posts: 12902
  • "Introverted Basement Dwelling Troll"
Re: Open baffle 32-inch subwoofer?
« Reply #14 on: 19 Feb 2018, 12:24 am »
1 ohm sub suited for automotive sound competition.
Not necessarily. Multiple drivers driven by the same amp.. .bla bla bla....
If this were an IB configuration, a single ohm amp would work.
If memory serves, were some of the Crown amps good down to one ohm?

WGH

  • Full Member
  • Posts: 2966
  • Artwork that Opens and Closes
    • WGH Woodworking
Re: Open baffle 32-inch subwoofer?
« Reply #15 on: 19 Feb 2018, 12:41 am »
It also says, "4 piece minimum order"

The OP can mount the 4 subs in the basement or crawlspace (if he has one) in an infinite baffle design, hopefully the house is bolted down.




FullRangeMan

  • Volunteer
  • Posts: 10302
  • All Tweeters look like a target, then shoot them!
    • Never go to a psychiatrist, adopt a straycat or dog. On the street they live only two years average.
Re: Open baffle 32-inch subwoofer?
« Reply #16 on: 19 Feb 2018, 01:14 am »
Not necessarily. Multiple drivers driven by the same amp.. .bla bla bla....
If this were an IB configuration, a single ohm amp would work.
If memory serves, were some of the Crown amps good down to one ohm?
These monsters automotive and stage woofers are too powerful to home audio appliance, they will need about 100W or more to starting emit any sound, it not suited to a regular audio amp.

Russell Dawkins

Re: Open baffle 32-inch subwoofer?
« Reply #17 on: 19 Feb 2018, 01:33 am »
These monsters automotive and stage woofers are too powerful to home audio appliance, they will need about 100W or more to starting emit any sound, it not suited to a regular audio amp.
Why would they need 100W if their sensitivity is 97 dB/W? If that were true, with 100W they would be producing 117 dB.

FullRangeMan

  • Volunteer
  • Posts: 10302
  • All Tweeters look like a target, then shoot them!
    • Never go to a psychiatrist, adopt a straycat or dog. On the street they live only two years average.
Re: Open baffle 32-inch subwoofer?
« Reply #18 on: 19 Feb 2018, 02:16 am »
Why would they need 100W if their sensitivity is 97 dB/W? If that were true, with 100W they would be producing 117 dB.
All speakers need a minimum power to made sound(below it there is no sound) varying according the electric afficiency in %(know as n0 % or η0 % or ETA ZERO in TS) and max power rms, the formula is:
Max W RMS x no %=minimum power rms

So 20.000WRMS x the n0% from these drivers is a lot of Wrms

Russell Dawkins

Re: Open baffle 32-inch subwoofer?
« Reply #19 on: 19 Feb 2018, 02:35 am »
All speakers need a minimum power to made sound(below it there is no sound) varying according the electric afficiency in %(know as n0 % or η0 % or ETA ZERO in TS) and max power rms, the formula is:
Max W RMS x no %=minimum power rms

So 20.000WRMS x the n0% from these drivers is a lot of Wrms

I don't follow your reasoning at all, sorry.