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Search: Posts Made By: diy speaker guy
Forum: DIY Speakers and Subs   06-29-2015, 02:45 PM
Replies: 226
Views: 3,136
Posted By diy speaker guy
Yeah, that's why I questioned the specs of all...

Yeah, that's why I questioned the specs of all the drivers, they are all rated on just the Bl curve and ignore all the other Klippel defined limitations. It's not easy to make a good motor, and SI...
Forum: DIY Speakers and Subs   06-29-2015, 12:41 PM
Replies: 226
Views: 3,136
Posted By diy speaker guy
Not conjecture at all. If SI ONLY uses the Bl...

Not conjecture at all. If SI ONLY uses the Bl curve to determine xmax it's almost 100 percent certain that all their high excursion products are rated well above what a real Klippel test (with all 4...
Forum: DIY Speakers and Subs   06-29-2015, 10:33 AM
Replies: 226
Views: 3,136
Posted By diy speaker guy
The same incorrect claims were made here again,...

The same incorrect claims were made here again, that's what was responded to. There was plenty of time to clear this up in any number of previous threads, but when the discussion turns technical the...
Forum: DIY Speakers and Subs   06-29-2015, 08:37 AM
Replies: 226
Views: 3,136
Posted By diy speaker guy
http://www.diyaudio.com/forums/subwoofers/240775-s...

http://www.diyaudio.com/forums/subwoofers/240775-stereo-integrity-24-ib-subwoofer-new-displacement-king-subwoofers-7.html#post3602649

Not sure exactly what you are asking for here, but there's the...
Forum: DIY Speakers and Subs   06-28-2015, 08:15 PM
Replies: 226
Views: 3,136
Posted By diy speaker guy
Testing at 70 percent Bl is fine. Ignoring the...

Testing at 70 percent Bl is fine. Ignoring the other factors that influence a true Klippel verified result is not fine. If you want to claim "Klippel verified" it has to follow Klippel's rules.
...
Forum: DIY Speakers and Subs   06-21-2015, 03:18 PM
Replies: 12
Views: 264
Posted By diy speaker guy
Ok, you added double Re for the compensation. ...

Ok, you added double Re for the compensation. Got it.

Ok, your measured Re isn't far off from Fi's spec, so that's good.



Sure, the lowpass will take a bite out of the 150 hz peak, but it's...
Forum: DIY Speakers and Subs   06-18-2015, 01:56 PM
Replies: 12
Views: 264
Posted By diy speaker guy
I don't have time to write a full opinion here,...

I don't have time to write a full opinion here, so here's just a few points.

1. Your measured t/s parameters in post 1 say Re is 2.3 ohms but in your most recent post the Hornresp inputs show Re...
Forum: DIY Speakers and Subs   06-18-2015, 07:38 AM
Replies: 12
Views: 264
Posted By diy speaker guy
If you double Re you have to add more power to...

If you double Re you have to add more power to regain the losses incurred by the extra Le. Even so, that gives you a more accurate representation of frequency response but some of the other graphs...
Forum: DIY Speakers and Subs   06-11-2015, 02:01 PM
Replies: 12
Views: 264
Posted By diy speaker guy
For which part? I'm not sure what...

For which part?

I'm not sure what frequencies Le and Le2 are measured at but regardless, I think this driver is going to have significant inductance issues that will considerably skew the...
Forum: DIY Speakers and Subs   06-06-2015, 02:05 PM
Replies: 42
Views: 1,236
Posted By diy speaker guy
There's a lot more to it than that. Consider...

There's a lot more to it than that. Consider also the wire gauge of the coil, motor cooling and a few dozen other things.

But assumptions can be made, especially when there's a lot of high...
Forum: DIY Speakers and Subs   06-06-2015, 01:12 PM
Replies: 20
Views: 563
Posted By diy speaker guy
Is anybody really going to put any of these...

Is anybody really going to put any of these things in a car? The jackhammer in a box would be 500 pounds and at least 2+ feet in the smallest dimension. What car are you going to put that in? Sure...
Forum: DIY Speakers and Subs   06-06-2015, 12:43 PM
Replies: 20
Views: 563
Posted By diy speaker guy
Last time I checked the square Jackhammer had...

Last time I checked the square Jackhammer had 3116 sq cm Sd and 35 mm xmax. But my old link doesn't work anymore it just redirects to MTX homepage. Anyway that works out to about 1/3 more...
Forum: DIY Speakers and Subs   06-05-2015, 08:56 PM
Replies: 42
Views: 1,236
Posted By diy speaker guy
No, not even a little bit odd. The CEA testing...

No, not even a little bit odd. The CEA testing signal is 6 cycles. At 20 hz 6 cycles is approximately 0.3 seconds. At 40 hz it's approximately 0.15 seconds. That's not exactly a demanding signal...
Forum: DIY Speakers and Subs   05-20-2015, 11:53 AM
Replies: 220
Views: 6,737
Posted By diy speaker guy
Agreed. 100 percent. That's...

Agreed. 100 percent.



That's irrelevant to the subject of bad specs. Specs are everything when that's all you have. Until a couple of days ago, specs and a whole lot of hot air and hype WERE...
Forum: DIY Speakers and Subs   05-20-2015, 11:46 AM
Replies: 220
Views: 6,737
Posted By diy speaker guy
It is by klippel standards. Le causes distortion...

It is by klippel standards. Le causes distortion and it is a limiting factor to xmax, along with the other things you mentioned and IM distortion.

If you want to claim "klippel verified" you have...
Forum: DIY Speakers and Subs   05-20-2015, 10:02 AM
Replies: 220
Views: 6,737
Posted By diy speaker guy
Apart from that claim, the xmax spec is wrong. ...

Apart from that claim, the xmax spec is wrong. Sundown clearly stated the SI 24 is limited to 20 mm xmax by Le. Want a link? He posted the Klippel graph that shows it too.

This is a huge...
Forum: DIY Speakers and Subs   05-20-2015, 09:47 AM
Replies: 220
Views: 6,737
Posted By diy speaker guy
Really? REALLY!?! You don't think specs are...

Really? REALLY!?!

You don't think specs are important? Who's going to test all the rest of the drivers in the world to make sure manufacturers post reliable specs?

Clearly from this thread...
Forum: DIY Speakers and Subs   05-20-2015, 08:25 AM
Replies: 220
Views: 6,737
Posted By diy speaker guy
True, I have a large amount of posts in this...

True, I have a large amount of posts in this thread, but they are almost all responses to other people poking at what I've said or asking questions. As far as I'm concerned it could have ended at my...
Forum: DIY Speakers and Subs   05-20-2015, 06:21 AM
Replies: 220
Views: 6,737
Posted By diy speaker guy
If the sealed box is too small max output will...

If the sealed box is too small max output will change since it often requires too much power to push it to xmax in the very small sealed box. The larger box boosts efficiency and it doesn't require...
Forum: DIY Speakers and Subs   05-20-2015, 05:37 AM
Replies: 220
Views: 6,737
Posted By diy speaker guy
Any driver can be used in IB (or any size up to...

Any driver can be used in IB (or any size up to IB). IB (or very large sealed) is almost always a better choice than small sealed unless size is a concern.
Forum: DIY Speakers and Subs   05-20-2015, 05:34 AM
Replies: 220
Views: 6,737
Posted By diy speaker guy
The measurements show it's pretty close to a pair...

The measurements show it's pretty close to a pair of TCs in small sealed boxes. So no, it does not equal $3000 worth of TCs in ported boxes, not even close, at least above tuning.

Not sure what...
Forum: DIY Speakers and Subs   05-19-2015, 07:05 PM
Replies: 220
Views: 6,737
Posted By diy speaker guy
As far as I know there are 4 ways that...

As far as I know there are 4 ways that manufacturers use to spec xmax.
1. Most popular, at least until recently was to specify xmax using physical coil and gap measurements.
2. More recently,...
Forum: DIY Speakers and Subs   05-19-2015, 06:49 PM
Replies: 220
Views: 6,737
Posted By diy speaker guy
I don't recall SI ever making that claim, but I...

I don't recall SI ever making that claim, but I don't recall him ever correcting the people that were making that claim either.

CEA specs don't tell you much about how the sub will perform with...
Forum: DIY Speakers and Subs   05-19-2015, 10:11 AM
Replies: 220
Views: 6,737
Posted By diy speaker guy
??? I've never had an HT18, I can't recall...

???

I've never had an HT18, I can't recall wanting SI to do anything with the HT18, and I don't know which "you guys" you are referring to. I've never met anyone on this forum and there's only 1...
Forum: DIY Speakers and Subs   05-19-2015, 08:38 AM
Replies: 220
Views: 6,737
Posted By diy speaker guy
I do prefer horns, so what? This has nothing to...

I do prefer horns, so what? This has nothing to do with anything. What I prefer most of all is accurate specs.

I'm not recommending ANY driver, at most I'm comparing drivers, so where is my...
Showing results 1 to 25 of 576

 
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