Looking to run a true 5HZ signal to my Sub woofers but think my anthem receiver will Bottle neck this.

[m. zillch]

How can you say that? Dolynick even said his subs don’t go that low…
It’s been graphed. I’ll look for it later…

OK, valid point, so I have modified my post.

 

[TLS Guy]

Here is the model of the driver under discussion.

I have done this very carefully. The program used was Bass Box Pro. This is a highly regarded program and used by many professional designers.

It basically shows what I had surmised from my now 72 years of speaker designing and building spekers.

First of all, it seems to be a very capable driver, but it can not perform miracles and has to abide by natures physical laws.

So the highlights.

Bass Box pro, as expected indicates this driver is suitable for sealed application only.

The optimal sealed volume is 8.28 cu.ft. with heavy fill.

The native F3 is as expected about an octave above Fs. which is 39.54 Hz, which rounding it off is 40 Hz, exactly what I estimated. So the driver rolls of at 12 db. per octave as all sealed designs do. Therefore it is -12 db. at 20 Hz as expected. So a boost of 12 db. per octave needs to be applies below 40 Hz.

Now this driver has good excursion limits, but it starts to head towards xmax below 20 Hz as you would expect. At 20 Hz the driver will tolerate 200 watts of power, below that it starts to exceed X-max, by 15 Hz the driver is running out of cone displacement and output is falling off and the driver risking damage. So as I suspected the driver needs high passing at 20 Hz, which is its effective lower frequency limit, as I suspected.

So, in essence this is a very capable sub driver, but it does not perform the miracle of defying the laws of physics. However with capable amplification and proper high and low pass filter settings, it appears to be a very capable LF driver, which for its cost and size it should be.

I hope this puts an end to the nonsense that has appeared on this thread and the insults from the OP. I stand by this model unreservedly, and it reveals the full facts of the situation.

 

[dolynick]

How can you say that? Dolynick even said his subs don’t go that low…
It’s been graphed. I’ll look for it later…

My last REW graphs show rolling off and dimishing (but still there) output down to the low teens and the data collection stops at ~13Hz. It's certainly doing something down sub 20 yet in that scene but, no, I'm claiming to hear 7Hz in it in my room.

 

[m. zillch]

The question is not what some individual's system/EQ/sub/speakers/placement/room/mic does but what does the old vs. new versions of the movie provide natively when measured directly (electrically/digitally, not acoustically).

 

[William Lemmerhirt]

The question is not what some individual's system/EQ/sub/speakers/placement/room/mic does but what does the old vs. new versions of the movie provide natively when measured directly (electrically/digitally, not acoustically).

Here’s one that I could find.

 

[TLS Guy]

Here’s one that I could find.

That reinforces my advice to high pass that driver below 20 Hz, to prevent damage to an expensive driver.

 

[m. zillch]

Maybe they should start marketing subwoofers as "Edge of Tomorrow early release version ready".

 

[dolynick]

Took a look at my REW graphs for the theatre post ARC and tweaking:

Aside from the null at the listening position around 21Hz, it is holding the 75db or better reference level all the way down to ~12.5Hz. Better than I remembered. I'm not sure if that roll-off gets a lot steeper going forward but I expect it probably does put out a modestly "feelable" 8Hz if asked too.

I typically do my sweep 10Hz - 21kHz and the mic starts picking things up through the audio stack after the first few Hz.

To the OP: There doesn't look to be a hard cut-off in output below 15Hz with this ARC tuning - just the normal rolling off of the sub I'd expect when asked to go lower than it's optimal range. This is coming off of an AVM70 8k.

 

[j_garcia]

I test routinely with the UHD content and it most certainly still has an absurdly deep bass tone going off that is only felt or heard by the walks of the basement creaking and cracking. I've found no difference at all between the BR content and the UHD's.

I bought the UHD and felt it was identical also.

 

[TLS Guy]

Took a look at my REW graphs for the theatre post ARC and tweaking:
View attachment 80038
Aside from the null at the listening position around 21Hz, it is holding the 75db or better reference level all the way down to ~12.5Hz. Better than I remembered. I'm not sure if that roll-off gets a lot steeper going forward but I expect it probably does put out a modestly "feelable" 8Hz if asked too.

I typically do my sweep 10Hz - 21kHz and the mic starts picking things up through the audio stack after the first few Hz.

To the OP: There doesn't look to be a hard cut-off in output below 15Hz with this ARC tuning - just the normal rolling off of the sub I'd expect when asked to go lower than it's optimal range. This is coming off of an AVM70 8k.

It depends on how loud you play it. The issue is that the driver really runs out of xmax at 15 Hz. It models exactly like you would predict of a driver with an Fs just above 20 Hz in a sealed box. What size was the box? It could be the box volume is not correct for that driver, giving it a peak. Getting the box volume right is crucial for any sub design.