| Speaker stuffing [message #79276] |
Tue, 04 February 2014 11:23  |
gstarey66
Messages: 12
Registered: January 2014
Location: Engineer
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Chancellor |
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Hello Wayne,
Have completed a 4PI speaker build with the exact sizes your plans give but with one variation I thought I would run by you now that I have more time.
I did play with speaker design s/w and varing the size slightly didn't seem to make much difference. So what I did was to add some additional bracing and to counter that size decrease, I went with R30 insulation on the back and one side with the bottom and middle using R11. In theory more insulation makes box seem larger. Hopefully the added bracing and insulation just about cancel. I know you can't tell me if they cancel well but can you tell me if the thinking was correct about the two effects being opposed? Would be possible to undo variation if needed.
Do know that I really like the sound I am getting.
Thank you,
Greg
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| Re: Speaker stuffing [message #79280 is a reply to message #79276] |
Tue, 04 February 2014 17:19  |
steve f
Messages: 238
Registered: May 2009
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Master |
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Hi Greg,
I have built several Pi speakers, and even a few variants. ( One PI towers, and 3 PI's built sidewise. ) If you can , stick to Wayne's plans. They are mature designs, have been in production for a while, and they sound great. I think it's more important to stick to dimension volume in the smaller boxes than the larger ones. Size gives you a little bit of wiggle room. I don't think an extra brace is going to hurt anything. I'm more worried about vent placement, and too much stuffing in the enclosure. You may have standing wave problems if you deviate too far from box dimensions, and vent placement. When you add extra stuffing to vented boxes, transients often lose their edge and sound dull. Experimenting is fun though. And my fire pit always seems to have one of my projects in it.
Steve
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| Re: Speaker stuffing [message #79351 is a reply to message #79276] |
Fri, 07 February 2014 22:25 |
grindstone
Messages: 46
Registered: May 2010
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Baron |
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I'll baldly say that bracing is always good if you've offset for it. Bracing is Really-Good.
I "get" your question and I admire your inquisitiveness. You're right -- there's a bit more "there" to be had -- it's just that people are silent because only You can decide. The down-side is that it actually sorts to a bunch of work. Personally, I found my way, I'm completely happy, and I have _ZERO_ doubts that I left anything on the table.
Keep-going, and keep-pushing. And please, please share your results (and reasons).
Many of us have done the same. We just don't hear things the same and we allow for the same (which is why your thread might seem like "crickets" to you).
Good-hunting and please share what you might choose-to. It's okay to report how anything comes-off to you--Wayne has created this amazing environment where data might be simply exchanged...as data.
Thanks for that, btw, Wayne!
Really, this stuff becomes about what you want and how much you're willing to put into it.
Okay, I'll step-up. Knowing mostly _zero_ about your rig or preferences or gear or challenges, here's one experiment for consideration.
Listen for a week to...whatever you have as it is -- limit it to say 5 releases that you know well. Do that. Heavy-rotation.
Now, for a new week, stick a cross-batt of the thick-stuff atop the braces and repeat.
If you've already done that, please forgive my challenge and my comprehension--I don't have much time at all for "boards" these years.
This is not a test, and I ask for Nothing regarding reports -- I'm only here to incite, to invoke, to "egg-on".
Follow your ears.
Always.
Just (_always_) keep two pieces of gear. Do not "advance" until you can beat your last piece.
You will be able to measure at any time. The dream would be to always keep all pieces of all gear. It's just, well, there's only been about a 15 year span in my life when i could keep Everything and measure Everything.
Well, it's not a good system (let-alone a Perfect System), but it's the system i could afford at the time.
Please share experiences.
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| Re: Speaker stuffing [message #79475 is a reply to message #79432] |
Mon, 17 February 2014 05:08 |
BFP
Messages: 48
Registered: May 2009
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Baron |
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It sounds like you have carefullly considered any changes you have made.
I kept to the internal dimensions that Wayne specified in my 3 build. I am very happy with the box performance. I added a lot of bracing and I cannot yet hear any colouration or resonances coming from the box. I did not add any mass to the horns. I'm wondering if it's really needed. I was going to use electrical putty which is clay like and not supposed to dry out but I thought it might come loose and end up causing a problem. When you tap the horn it sems to have quite a low resonance, certainly below it's cut off frequency. Has anyone done the damping afterwards and heard any differences?
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