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naked OB speaker http://dcaudiodiy.com/phpBB3/viewtopic.php?f=4&t=1389 |
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Author: | ratbagp [ May 29th, 2019, 11:29 am ] |
Post subject: | naked OB speaker |
I posted recently about the curious naked speakers with the PRV 5MR450-NDY along with 18" woofers. Scroll down to the end of the following. https://www.trans-fi.com/ob-speakers More about the PRV here https://www.parts-express.com/prv-audio-5mr450-ndy-5-midrange-neodymium-woofer-8-ohm--294-2705 I'm thinking of doing something like this but without the very heavy 18" woofers. 44 pounds per woofer is way too much for me these days. And I don't play music that loud and mostly I listen to classical. I would just use one PRV per channel. Instead, I am thinking of two options. I already have a couple of the Goldwood 18" woofers that Roscoe also used. I could get a couple more. https://www.parts-express.com/goldwood-gw-1858-18-pro-woofer--290-386 Or I could try the GRS 15" units with 4 for about $100. https://www.parts-express.com/grs-15pf-8-15-paper-cone-foam-surround-woofer--292-415 Both Goldwood and GRS speakers have a high QTS suitable for open baffle and they are relatively lightweight. I suspect that mounting the woofers facing each other creates some sort of SLOB effect which I seem to remember is supposed to lower the fs. Suspending the speakers should not be too difficult. Certainly, I would not be doing all the steel pipe stuff. The speakers would be visually interesting and different. In a small room it would not require too much power to run the PRVs and the woofers could be handled by a separate more powerful amp. Crossover with a Minidsp or similar. Any comments or ideas. ray |
Author: | Stuart Polansky [ May 29th, 2019, 12:02 pm ] |
Post subject: | Re: naked OB speaker |
S.L.O.B. would require that they be wired anti-phase. |
Author: | Roscoe Primrose [ May 29th, 2019, 1:27 pm ] |
Post subject: | Re: naked OB speaker |
Stuart Polansky wrote: S.L.O.B. would require that they be wired anti-phase. Not if they're mounted facing each other... Roscoe |
Author: | Stuart Polansky [ May 29th, 2019, 2:13 pm ] |
Post subject: | Re: naked OB speaker |
Roscoe Primrose wrote: Stuart Polansky wrote: S.L.O.B. would require that they be wired anti-phase. Not if they're mounted facing each other... Roscoe That wasn't my image of what was suggested. My bad! Remedial reading comprehension for me! Ray did write that in plain English! |
Author: | mix4fix [ May 29th, 2019, 2:39 pm ] |
Post subject: | Re: naked OB speaker |
Could you use tweeter and midrange instead of a full-range driver? |
Author: | Roscoe Primrose [ May 29th, 2019, 3:04 pm ] |
Post subject: | Re: naked OB speaker |
mix4fix wrote: Could you use tweeter and midrange instead of a full-range driver? Yes, but: 1: Most midrange drivers don't go down low enough to meet the large woofers needed for this type of design. A "midbass" driver would probably be a better choice. 2: Most tweeters have sealed backs, to you won't get the dipole radiation pattern you'd get with a full-range driver unless you mount a second tweeter pointed backwards and wired out of phase. You may want to pad the second tweeter down a bit as well. Roscoe |
Author: | mix4fix [ May 29th, 2019, 3:18 pm ] |
Post subject: | Re: naked OB speaker |
Just asking. I want to use those drivers I got from Tom. |
Author: | ratbagp [ May 29th, 2019, 3:43 pm ] |
Post subject: | Re: naked OB speaker |
I am thinking that using two woofers per side makes exceeding xmax less likely than just having one. It may also make suspending the woofers easier. I was wondering if there was a special distance needed between the woofers, but since there is no SLOB effect, then I presume it doesn't matter. Possibly I could use pvc pipe for the frame and possibly fill it with sand. A triangular shape comes to mind. Any other ideas? I would use some sort of dowel or long bolts to separate the woofers and then suspend the set of two woofers by a piece of one of those exercise bands. The yellow would be quite fetching. Each PRVs could be suspended by a heavy-duty rubber band. This might be worth playing with. ray |
Author: | Stuart Polansky [ May 29th, 2019, 4:06 pm ] |
Post subject: | Re: naked OB speaker |
Roscoe Primrose wrote: mix4fix wrote: Could you use tweeter and midrange instead of a full-range driver? 2: Most tweeters have sealed backs, to you won't get the dipole radiation pattern you'd get with a full-range driver unless you mount a second tweeter pointed backwards and wired out of phase. You may want to pad the second tweeter down a bit as well. Roscoe Or Attachment:
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Author: | mix4fix [ May 29th, 2019, 4:10 pm ] |
Post subject: | Re: naked OB speaker |
That's not going to work. |
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