Enclosure for high Qts driver

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hurdy_gurdyman

Re: Enclosure for high Qts driver
« Reply #20 on: 27 Jan 2019, 09:05 pm »
WAF is important. That is why i said “as large as possible”. Pegboard has the holes, but might have resonance issues.

Have a look for baffle… that has some good suggestions for a backless (or large percentage holes), box pushing hard towards aperiodic.

dave
As for WAF, I don't have a wife, so looks are secondary. If I ever do get married again, I can cover with grill-cloth or some other creative idea.

Pegboard with braces may work if braced solid. Sounds like a simple way to do it, and at this late stage of my life, simple is always preferred.

Dave :green:

JLM

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Re: Enclosure for high Qts driver
« Reply #21 on: 27 Jan 2019, 09:30 pm »
I know your space is tight, but what are the dimensions?  Could you turn the couch/speakers 90 degrees to gain a bit of depth?  You've had OB with rear damping in the past, could you try it again? 

How about a front/sides cabinet with styrofoam backing as an extreme/easier pegboard sort of idea?  Easier to cut at the store/lumber yard to fit in the car.  You could easily cut small holes into the styrofoam to simulate a flexible aperiodic effect, then enlarge/add more holes to experiment.  One sheet should allow for multiple trials. 

I know you have more experience than most of us here, but glad you spoke up! 

hurdy_gurdyman

Re: Enclosure for high Qts driver
« Reply #22 on: 27 Jan 2019, 11:28 pm »
I know your space is tight, but what are the dimensions?  Could you turn the couch/speakers 90 degrees to gain a bit of depth?  You've had OB with rear damping in the past, could you try it again? 

How about a front/sides cabinet with styrofoam backing as an extreme/easier pegboard sort of idea?  Easier to cut at the store/lumber yard to fit in the car.  You could easily cut small holes into the styrofoam to simulate a flexible aperiodic effect, then enlarge/add more holes to experiment.  One sheet should allow for multiple trials. 

I know you have more experience than most of us here, but glad you spoke up!
Hi Jeff, good to see you here. I do know a lot about OB, seeing as I've been building them since around 2001. That was always in a spacious living room where almost anything worked. This present room, about 13' wide x 15' long, is cramped. I have already changed a lot of things since your visit. I built H-frame OB's for my sub. I can reach 23 Hz with these now. The main reason I built them is to have a platform to place experimental baffles and enclosures. I retired the Betsy drivers for now and have a pair of EV LT-12 coaxial drivers (EV called them triaxial because of whizzer and horn tweeter). I have always liked the sound of the vintage EV drivers on OB's. These sound liquid smooth on the mellow Jazz I like to listen to. I can close my eyes and almost smell the smoke in the Chicago night clubs. They sit much lower than those tall baffles I had. That helped the image appear more natural. Just too many close reflections behind them in both locations. That's why I thought about building boxes and doing away with the back wave. Right now I'm visualizing an L shaped baffle (wedge baffle) with around a 14 inch wing on the inside of the baffles, and open framework around the outer side, top and back. Either use pegboard or mesh wire (like that used on small animal pens) to enclose everything and stuff with poly-fill. I'd have to design the back to be removable, as these old speakers only mount to the back of the baffle board. This would all be easy if my woodshop was up and working, but it isn't. It's all packed tightly in my shed. I'd have to have Home Depot do most of the cutting, which means $$.

At least I have some ideas now to bounce around in the somewhat vacant mind of mine.

Oh yeah, almost forgot. I have a single EV TRXC with a Qts of .667. If I could find another one, I'd use those. Much more suited for a box, like maybe TQWT.

Dave :green:
« Last Edit: 28 Jan 2019, 02:11 am by hurdy_gurdyman »

hurdy_gurdyman

Re: Enclosure for high Qts driver
« Reply #23 on: 28 Jan 2019, 06:26 am »
Here's a pic of my current proof-of-concept OB's with the EV LT-12's on top. The metal grills are a necessity since I have two sixty pound dogs. A vigorous waving tail could rip a paper cone right out. When my final speakers are done, I'll make a removable grill-cloth using quite transparent material. The undersized 16 inch square baffles are some old adapters I had mad to allow a 12 inch driver to mount onto a baffle with a hole cut for a 15 inch driver. I just threw some metal shelf brackets on the back to make legs.



If I could make a baffle about 9 inches taller and 4 or 5 inches wider, then make the sides 15 inches deep, I wonder if it would be of a size suitable for an aperiodic box. Anybody care to make a suggestion about the size? A straight forward box would be the easiest to make, leave the back covered with a braced pegboard and stuff the box with poly-fill.  :scratch:

Dave  :green:

FullRangeMan

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Re: Enclosure for high Qts driver
« Reply #24 on: 28 Jan 2019, 11:28 am »
Dave: as you have limited space I could seriously consider a planar headphone as Audeze LCD2Classic or HifiMan Sundara(all metal cans) now $349 or an cheap HE400 with a headphone amp.

hurdy_gurdyman

Re: Enclosure for high Qts driver
« Reply #25 on: 28 Jan 2019, 03:26 pm »
Dave: as you have limited space I could seriously consider a planar headphone as Audeze LCD2Classic or HifiMan Sundara(all metal cans) now $349 or an cheap HE400 with a headphone amp.
FullRangeMan,

I can't wear headphones anymore. I've reached the stage where I wear hearing aids. They rest on top of my ears. I have yet to see a headphone that has a cup large enough to comfortably fit over everything.

Dave :green:

FullRangeMan

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Re: Enclosure for high Qts driver
« Reply #26 on: 28 Jan 2019, 11:44 pm »
FullRangeMan,

I can't wear headphones anymore. I've reached the stage where I wear hearing aids. They rest on top of my ears. I have yet to see a headphone that has a cup large enough to comfortably fit over everything.

Dave :green:
Too bad, the 400 are so affordable, good luck on your journey.
To know what you dont like is half way.