Have you ever bottomed a SI18? - AVS Forum
View Poll Results: Have you ever bottomed a SI18
Yes 0 0%
Not that I know of 3 33.33%
Definitely not 6 66.67%
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post #1 of 9 Old 10-27-2014, 10:50 AM - Thread Starter
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Have you ever bottomed a SI18?

I'm continually shocked at what my single full marty is capable of. I'm curious if anyone has found the mechanical limits of our much-loved SI18.

If so, please post what enclosure you have, how it's tuned, what amp you're running, what content was playing and what volume level you were running.

If not, post what enclosure(s) and how many you have, what amp(s), what volume level you typically run, and if you have plans to upgrade to more/different subs.
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post #2 of 9 Old 10-27-2014, 10:56 AM - Thread Starter
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I'm pretty sure I've never bottomed my sub. It's a full marty tuned to 15hz. I run between -15 and -10dB, and use a Behringer epq2000 bridged. After I upgrade my mains to Tempests (probably) I'll build another full marty or maybe 3 more so I can run reference level to 15hz.
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post #3 of 9 Old 10-27-2014, 11:11 AM
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Own nine HT18's (eight d4, one d2) and while not necessarily fully powered I have never bottomed any.

In fact I don't believe I have bottomed a sub since my old Tempest 15". Even then it might have just been amp clipping.



People who bottom subs need more subs.
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My Dual 18" LLT subs 120dB down to 10hz

 

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post #4 of 9 Old 10-27-2014, 11:16 AM
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Quote:
Originally Posted by Scott Simonian View Post


People who bottom subs need more subs.
I think that needs to be your new signature.

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post #5 of 9 Old 10-27-2014, 11:19 AM
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I think that needs to be your new signature.
It does have quite a sig-worthy ring to it, doesn't it?

My Dual 18" LLT subs 120dB down to 10hz

 

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post #6 of 9 Old 10-27-2014, 11:24 AM
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Depends on the sub design to. I'm not sure about the SI, but some subs will clank pretty hard, others will gracefully run out of BL and the suspension will go tight. You may never know the later is bottoming except that output has basically stopped going up and it doesn't sound to great.
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post #7 of 9 Old 10-27-2014, 11:52 AM
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I've so far only seen my SIs moving perhaps half an inch each way for very limited periods of time, and I was scared for my room! lol
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post #8 of 9 Old 10-27-2014, 12:02 PM
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I've so far only seen my SIs moving perhaps half an inch each way for very limited periods of time, and I was scared for my room! lol
I'm always surprised by this as well. I have scenes that feel like something in the room is going to give (grenade scene in WWZ) and I think the subs must be flat moving, only to find out they are barely doing anything at all.
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post #9 of 9 Old 10-27-2014, 12:19 PM
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The SI-18's xmech is a lot higher than it's xmax 70% BL, so it probably runs out of motor force before it bottoms (at least in the positive direction for sure.)

Ported subs have less excursion at a given SPL above tune so it's not a surprise.
(Below tune with no filter though... is another ball of wax.)

So far with sealed subs I have:
Velodyne Non-Servo: Thermaled and Bottomed (750w)
Velodyne Servo: Thermaled and Bottomed (1250w)
SDX-15: Thermaled, Fried and Bottomed (2-4kW)
UM-15: Thermaled and Bottomed (4kW)
Dayton PA-18: Fried (1kW)
LMS-18: Thermaled and Bottomed (4-8kW)
Mal-21: Thermaled, never bottomed (4kW).

With enough power and effort, it's possible to nuke anything.

I have 7 SEOS's in movie-mode or in 7ch-Stereo music-mode, which outputs a summed: 106-109db of treble with just 1 watt of input (depending on exactly where in the room you are standing.) and they are rated for 120watts EACH.

Now that I have over 15 subs, it takes a great deal of effort and SPL-tolerance to bottom and thermal everything out simultaneously. Summed efficiency is: 106db of bass per watt from 6hz to 200hz (and I have thousands of watts of bass, like most people in the DIY forum).

Most sane people would cry uncle within a few seconds, especially after say: 4 straight hours of 115-130db continuous-SPL with no hearing protection on to save them from doom.

Loud enough that people 200ft away have called the cops on me multiple times.

Wouldn't surprise me too much if my system made the list of: the Top 200 loudest home theaters ever built EVER.
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Last edited by BassThatHz; 10-27-2014 at 10:09 PM.
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