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Search: Keyword(s): ; Posts Made By: diy speaker guy
Forum: DIY Speakers and Subs   08-25-2016, 11:21 PM
Replies: 52
Views: 1,165
Posted By diy speaker guy
I published my study, no one else. All the...

I published my study, no one else.

All the measurements in the paper (except one) came directly from Ricci, most from data-bass, some from the data-bass forum. That accounts for the measurement...
Forum: DIY Speakers and Subs   08-24-2016, 10:34 PM
Replies: 52
Views: 1,165
Posted By diy speaker guy
I don't troll anything, I respond when I see...

I don't troll anything, I respond when I see misinformation and crazy claims. And I haven't seen any for quite awhile now, as such I haven't said a word about the 24s, Stereo Integrity or you for...
Forum: DIY Speakers and Subs   08-24-2016, 03:14 PM
Replies: 52
Views: 1,165
Posted By diy speaker guy
Well I just posted a flat baffle OB vs a H frame...

Well I just posted a flat baffle OB vs a H frame OB vs a 14 cu ft sealed box all with the same driver. The sealed box will outperform both the OB designs by a large margin, especially at the low...
Forum: DIY Speakers and Subs   08-24-2016, 10:07 AM
Replies: 52
Views: 1,165
Posted By diy speaker guy
Your output doesn't stop at 20 hz, it just starts...

Your output doesn't stop at 20 hz, it just starts to decrease. There's still lots of spl at lower frequencies. Spl is pressure, so you should be feeling pressure if there's enough spl, and with a...
Forum: DIY Speakers and Subs   08-24-2016, 09:24 AM
Replies: 52
Views: 1,165
Posted By diy speaker guy
Not in terms of output. As long as the driver is...

Not in terms of output. As long as the driver is quiet enough at the excursions you need and the distortion is low enough, if there's enough output and it extends as low as you want you are good to...
Forum: DIY Speakers and Subs   08-23-2016, 10:43 PM
Replies: 52
Views: 1,165
Posted By diy speaker guy
What on earth are you going on about now? This...

What on earth are you going on about now? This is a pretty good result for an OB sub, how could it not be? There's a ton of displacement and a fairly high q driver (when the large coil lossy...
Forum: DIY Speakers and Subs   08-23-2016, 09:15 PM
Replies: 52
Views: 1,165
Posted By diy speaker guy
Doesn't really make any meaningful difference. ...

Doesn't really make any meaningful difference. With the new t/s the response curve shape is almost identical in the H frame but 2 db down across the entire passband. But it takes less excursion to...
Forum: DIY Speakers and Subs   08-23-2016, 06:30 PM
Replies: 52
Views: 1,165
Posted By diy speaker guy
All these sims include a floor boundary but no...

All these sims include a floor boundary but no walls or ceiling, so this is what you would get if you took these outside and measured from 1 meter in front of the sub.

Differences between these...
Forum: DIY Speakers and Subs   08-23-2016, 06:27 PM
Replies: 52
Views: 1,165
Posted By diy speaker guy
And finally we have H frame vs flat baffle. ...

And finally we have H frame vs flat baffle.

Same H frame design as before and for the flat baffle I just decreased the U frame depth from 32 inches to .1 inches giving essentially a flat baffle...
Forum: DIY Speakers and Subs   08-23-2016, 06:15 PM
Replies: 52
Views: 1,165
Posted By diy speaker guy
Now H frame vs sealed shown in Hornresp. This is...

Now H frame vs sealed shown in Hornresp. This is all pretty self explanatory same H frame as above vs a 14 cu ft sealed box. Note that at 10 hz both designs show the same spl but at all other...
Forum: DIY Speakers and Subs   08-23-2016, 06:08 PM
Replies: 52
Views: 1,165
Posted By diy speaker guy
I wasn't feeling well today so I had a nap and...

I wasn't feeling well today so I had a nap and slept all day. Sorry about that.

I wanted to do this all in Hornresp, it would only take a couple of minutes, but Hornresp didn't want to sim the...
Forum: DIY Speakers and Subs   08-23-2016, 06:58 AM
Replies: 52
Views: 1,165
Posted By diy speaker guy
Same t/s as what data-bass measured?

Same t/s as what data-bass measured?
Forum: DIY Speakers and Subs   08-23-2016, 06:53 AM
Replies: 52
Views: 1,165
Posted By diy speaker guy
That depends on a lot of things - driver t/s...

That depends on a lot of things - driver t/s parameters, the room and placement within the room. It's easy enough to sim it and see what the raw response should look like.
Forum: DIY Speakers and Subs   08-23-2016, 06:50 AM
Replies: 52
Views: 1,165
Posted By diy speaker guy
I can sim flat baffle, U baffle and H baffle if...

I can sim flat baffle, U baffle and H baffle if you want. The problem is that the room and sub placement within the room is incredibly important, it dominates the response. This is true of every...
Forum: DIY Speakers and Subs   08-22-2016, 05:14 PM
Replies: 45
Views: 849
Posted By diy speaker guy
All of these "optimal" qtc alignments are...

All of these "optimal" qtc alignments are throwbacks to a 1950's mentality when big amps were 10 watts and nobody had any eq capability. In that case .7 and .5 qtc alignments made a lot of sense. ...
Forum: DIY Speakers and Subs   08-22-2016, 03:42 PM
Replies: 45
Views: 849
Posted By diy speaker guy
No it isn't. As long as the driver has lots of...

No it isn't. As long as the driver has lots of xmax and you have eq there's no downside to using drivers with strong motor force in IB.
Forum: DIY Speakers and Subs   08-22-2016, 10:13 AM
Replies: 5
Views: 178
Posted By diy speaker guy
If you choose to pursue qtc = .7 as your primary...

If you choose to pursue qtc = .7 as your primary goal then it is the goal but what makes you think it's optimal?

Qtc describes the shape of the low knee and the slope of the rolloff. Neither of...
Forum: DIY Speakers and Subs   08-21-2016, 07:57 PM
Replies: 5
Views: 178
Posted By diy speaker guy
Most of the time the recommendations you see have...

Most of the time the recommendations you see have to do with getting the most bang out of the smallest possible box which is quite different from optimal performance.

If you want sealed and want...
Forum: DIY Speakers and Subs   08-21-2016, 01:10 PM
Replies: 45
Views: 849
Posted By diy speaker guy
No, this is incorrect. While it may be...

No, this is incorrect.

While it may be possible (easy even) to find obscure and incomplete textbook definitions and 1950's marketing literature that describes IB in these terms, common modern...
Forum: DIY Speakers and Subs   08-13-2016, 04:22 PM
Replies: 41
Views: 493
Posted By diy speaker guy
All I'm doing is adjusting for large coil...

All I'm doing is adjusting for large coil inductance issues which a few people have explained a bit. If you read the paper I linked to earlier it will make the issue and it's correction really...
Forum: DIY Speakers and Subs   08-13-2016, 04:18 PM
Replies: 41
Views: 493
Posted By diy speaker guy
Forget walmart, look at kijiji or craigslist in...

Forget walmart, look at kijiji or craigslist in the $20 price range. Hornresp is very undemanding of resources, even the most modest 12 year old win xp box will have no problems running it. If you...
Forum: DIY Speakers and Subs   08-13-2016, 03:55 PM
Replies: 41
Views: 493
Posted By diy speaker guy
I have to apologize, I don't know where my head...

I have to apologize, I don't know where my head is today. I've said several times 35 cu ft (or 1000 liters) is enough to qualify as IB for this driver. This is not true. This driver's Vas is 605...
Forum: DIY Speakers and Subs   08-13-2016, 03:35 PM
Replies: 41
Views: 493
Posted By diy speaker guy
Change the slot length and shape and you can do...

Change the slot length and shape and you can do whatever you want with it. This is just one example of extreme reduction of the peak and extended bandwidth. Note that this horn shaped slot gives a...
Forum: DIY Speakers and Subs   08-13-2016, 03:24 PM
Replies: 41
Views: 493
Posted By diy speaker guy
The upper bass doesn't seem strong because you...

The upper bass doesn't seem strong because you currently have a huge hump at 40 hz and 100 hz is about 5 db down because of your tiny boxes. if you went to IB 100 hz would only be 1 or 2 db down and...
Forum: DIY Speakers and Subs   08-13-2016, 03:12 PM
Replies: 41
Views: 493
Posted By diy speaker guy
I can sim the FTW later but it probably won't be...

I can sim the FTW later but it probably won't be much different. I don't see Le listed for the FTW either so I'd have to guess, and I'd guess Le (in mh) = Re (in ohms) which gives a normalized Le of...
Showing results 1 to 25 of 866

 
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