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Forum: Dedicated Theater Design & Construction   09-17-2014, 06:45 PM
Replies: 8
Views: 188
Posted By HopefulFred
It's generally understood that bass decay is...

It's generally understood that bass decay is going to be longer than elsewhere in the frequency spectrum. That's not cause or serious concern. My initial reaction is that you look pretty good. ...
Forum: Dedicated Theater Design & Construction   09-17-2014, 01:07 PM
Replies: 1,997
Views: 127,054
Posted By HopefulFred
I know you know, so how come there's no thread,...

I know you know, so how come there's no thread, you know?

http://www.diysoundgroup.com/waveguide-speaker-kits/fusion-15/fusion15-kit.html

lalalalal ::I'm not listening to you saying that...
Forum: Dedicated Theater Design & Construction   09-16-2014, 08:05 PM
Replies: 2
Views: 89
Posted By HopefulFred
I found I was most comfortable in MS Paint. ...

I found I was most comfortable in MS Paint. Maybe I'm half luddite. The key was committing to a scale. 2"/pixel I think is what I used.
...
Forum: DIY Speakers and Subs   09-16-2014, 02:36 PM
Replies: 15
Views: 322
Posted By HopefulFred
Are the drivers all installed with some kind of...

Are the drivers all installed with some kind of gasket (either integral with the driver or added between the flange and baffle)?

Have you doubled checked the two woofers are wired to the crossover...
Forum: Dedicated Theater Design & Construction   09-16-2014, 11:50 AM
Replies: 519
Views: 22,950
Posted By HopefulFred
Or if you know you'll need a few sheets of...

Or if you know you'll need a few sheets of plywood or something eventually, you could just go ahead and buy them. Just set the furniture on a stack of sheet goods.
Forum: DIY Speakers and Subs   09-15-2014, 08:04 PM
Replies: 42
Views: 684
Posted By HopefulFred
I don't think this would be a good crossover to...

I don't think this would be a good crossover to build, but I'd like to post it to ask about it anyway.

The output of the system is lower than the output of the woofer at frequencies near but below...
Forum: DIY Speakers and Subs   09-15-2014, 07:50 PM
Replies: 42
Views: 684
Posted By HopefulFred
This is a weird process. I'm still too new to it...

This is a weird process. I'm still too new to it to pay attention to all the things happening at once, so it can be a little frustrating. I've tried to get rid of the expensive parts and I've tried...
Forum: DIY Speakers and Subs   09-15-2014, 12:05 PM
Replies: 1,897
Views: 88,626
Posted By HopefulFred
That would be money well-spent, but don't...

That would be money well-spent, but don't overlook those JBLs. Easy button, and probably not as expensive as you think. (Was that posted in this thread? I think you saw it from this morning.)
Forum: Dedicated Theater Design & Construction   09-15-2014, 10:20 AM
Replies: 1,532
Views: 78,188
Posted By HopefulFred
Keep in mind that the expanded color gamut is...

Keep in mind that the expanded color gamut is still a moving target, and content is king. If the give you DCI spec and then UHD bluray comes with rec.2020, you've missed the boat.
Forum: DIY Speakers and Subs   09-15-2014, 09:27 AM
Replies: 1,897
Views: 88,626
Posted By HopefulFred
Mfusick, I have a hard time keeping all that...

Mfusick, I have a hard time keeping all that efficiency and sensitivity stuff straight, but (one of) the crucial aspects is that sensitivity is properly stated as dB response to a specific voltage...
Forum: DIY Speakers and Subs   09-15-2014, 08:36 AM
Replies: 42
Views: 684
Posted By HopefulFred
That's great feedback from all three of you guys....

That's great feedback from all three of you guys. Thanks very much. I'll go back to the drawing board. :)

Fred
Forum: Dedicated Theater Design & Construction   09-15-2014, 06:37 AM
Replies: 615
Views: 32,737
Posted By HopefulFred
70 is often the primary vertical mode (resonance...

70 is often the primary vertical mode (resonance between floor and ceiling). 100+ will definitely be "other."
Forum: Dedicated Theater Design & Construction   09-15-2014, 06:16 AM
Replies: 615
Views: 32,737
Posted By HopefulFred
Primary axial modes? Or other?

Primary axial modes? Or other?
Forum: DIY Speakers and Subs   09-14-2014, 07:02 PM
Replies: 42
Views: 684
Posted By HopefulFred
Maybe here's a chance to pick some nits (one of...

Maybe here's a chance to pick some nits (one of my favorite things to do). I have worked up a couple designs that, nearest I can tell, would be worth listening to. What I wonder is if there can be...
Forum: DIY Speakers and Subs   09-14-2014, 04:34 PM
Replies: 42
Views: 684
Posted By HopefulFred
There it is - it's the 240 micro-farad cap in the...

There it is - it's the 240 micro-farad cap in the zobel network. Getting rid of that brings the lower half all up above 6 Ohms - of course now there's a dip at the crossover, but I can probably iron...
Forum: DIY Speakers and Subs   09-14-2014, 04:10 PM
Replies: 42
Views: 684
Posted By HopefulFred
The heart of the low impedance "problem" if it is...

The heart of the low impedance "problem" if it is a problem (obviously playback level and amplifier dependent) tends to be in the 200-400 Hz area, where the woofer drop to 3 Ohms in some cases.
...
Forum: DIY Speakers and Subs   09-14-2014, 02:45 PM
Replies: 42
Views: 684
Posted By HopefulFred
Is there anything that will bring up impedance...

Is there anything that will bring up impedance without burning output/sensitivity? (I don't think there is... but it would be nice)
Forum: DIY Speakers and Subs   09-13-2014, 07:46 PM
Replies: 42
Views: 684
Posted By HopefulFred
Good tips, and things I hadn't considered. I was...

Good tips, and things I hadn't considered. I was getting the feeling that I could do that with the power source, but I hadn't tried.

In my particular case (at this point in the piddling around...
Forum: DIY Speakers and Subs   09-13-2014, 01:57 PM
Replies: 42
Views: 684
Posted By HopefulFred
Thanks Bill. I won't worry about the square wave...

Thanks Bill. I won't worry about the square wave - still not sure what else to worry about though. I'm still looking for things other than frequency response and phase to consider - if that's all I...
Forum: DIY Speakers and Subs   09-12-2014, 08:11 PM
Replies: 42
Views: 684
Posted By HopefulFred
Finally I come back to what was originally asked...

Finally I come back to what was originally asked of me. What are my design goals?

Following the format above... here we go.

1. Must work for music without subwoofer - will never be used with...
Forum: DIY Speakers and Subs   09-12-2014, 07:49 PM
Replies: 42
Views: 684
Posted By HopefulFred
It's late at night again, and I've burned my...

It's late at night again, and I've burned my Friday evening looking at this. Maybe I'll come away with something - I'm sure I am, slowly.

First, of course Ryan is right that I haven't included...
Forum: DIY Speakers and Subs   09-12-2014, 01:21 PM
Replies: 42
Views: 684
Posted By HopefulFred
Super. So the tweeter is delayed by the...

Super.

So the tweeter is delayed by the distance (time) between the baffle and the driver, but the woofer is as well, isn't it? Additionally, what about the group delay inherent in the driver -...
Forum: DIY Speakers and Subs   09-12-2014, 12:03 PM
Replies: 42
Views: 684
Posted By HopefulFred
Thanks Jack - I'll look into Charlie Laub. I...

Thanks Jack - I'll look into Charlie Laub. I understand the principle of the offset, but maybe I'm missing something in XSim. I figured that either I would be able see the phase act weird as I...
Forum: Dedicated Theater Design & Construction   09-12-2014, 10:58 AM
Replies: 13
Views: 501
Posted By HopefulFred
^^yep.

^^yep.
Forum: DIY Speakers and Subs   09-12-2014, 10:44 AM
Replies: 42
Views: 684
Posted By HopefulFred
This is the sort of stuff that I'm interested in...

This is the sort of stuff that I'm interested in insight into. I expect that these subtler decisions are based largely on experience, and that each driver combination and design goal will lead to...
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