From endless contemplation to fruition: James' First DIY 18" Sub. How low can you go...$-wise? - Page 7 - AVS Forum
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post #181 of 195 Old 10-24-2012, 05:47 AM - Thread Starter
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I'll get to it tonight, gang.

James

Actual phone call (see pic to left):

 

Tech (responding to laughter): "I'm sorry sir, did I miss something?"

Me: "Yeah, a case of Diet Mountain Dew walking across my living room."

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post #182 of 195 Old 10-26-2012, 04:21 AM
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No speaker grills with a baby rolling around that woofer?

What did you use to isolate the shelf with the cabinet? Is there significant vibration on the top shelf? E.g. what does it do to the lamp/light or if you put a drink down on it?


Incredible job! I need a sub for my living room and you're really motivating me to take the plunge into DIY.
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post #183 of 195 Old 10-26-2012, 05:55 AM
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Quote:
Originally Posted by MKtheater View Post

No difference once you find a great location. A dual cab should have 6 dBs of gain with double the power because they are automatically colocated. Now two separate cabs could give you 6 dBs more but being so close you might as well build duals anyways. To me the advantage to a single cab are for the high x-max drivers where getting max gain(6 dBs) is not as important but that is my preference.

Can you explain to me what you guys mean by adding an additional 6db's? Is it that you will gain an extra 6db's of output by going with duels or 2 separate cabs? How does wattage figure into all of this?
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post #184 of 195 Old 10-26-2012, 06:26 AM
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Quote:
Originally Posted by Martycool007 View Post

Can you explain to me what you guys mean by adding an additional 6db's? Is it that you will gain an extra 6db's of output by going with duels or 2 separate cabs? How does wattage figure into all of this?

When you add another driver(same driver) you gain 3 dBs and then if you double the power you gain 3 dBs. So 6 dBs is max you can gain and if the drivers are in separate cabs and spread apart you can gain 1-6 dBs.
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post #185 of 195 Old 10-26-2012, 08:28 AM - Thread Starter
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Thanks viva. The cabinet is actually incredibly inert straightaway, but there are also small rubber "bumper feet" fastened to the underside of the tray feet.

Now I have them atop some black rubber coasters but Im going to pick up a few smaller furniture/chair leg rubber "pods" and integrate them.

Perhaps I'll throw together a vid with the cabinet during some spirited playback. I'm quite impressed with the cabs overall quietness, for lack of a better word.

James

Actual phone call (see pic to left):

 

Tech (responding to laughter): "I'm sorry sir, did I miss something?"

Me: "Yeah, a case of Diet Mountain Dew walking across my living room."

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post #186 of 195 Old 10-26-2012, 08:31 AM - Thread Starter
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BTW: my little girl really does leave it alone and the one time she went after it, it was fine.

It is a VERY thick aluminum and even the dust cap is quite robust.

I think you really have to be going out of your way to harm it.

I promise Ill post more comprehensive feedback today. I've just been very busy the last few days.


James

Actual phone call (see pic to left):

 

Tech (responding to laughter): "I'm sorry sir, did I miss something?"

Me: "Yeah, a case of Diet Mountain Dew walking across my living room."

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post #187 of 195 Old 10-26-2012, 08:50 AM
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where's the impression and reviews?smile.gif
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post #188 of 195 Old 10-26-2012, 10:14 AM
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James is holding out on us.

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

 

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post #189 of 195 Old 10-29-2012, 05:46 AM - Thread Starter
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^ ha ha. Nah, just very busy.

In word though, the sub sounds great. I've been running it alone for a few days now and it's really doing a fine job filling my decently-sized living/dining room space (~ 3500^3's).

I haven't reached its limits (the driver's mechanical limits, anyway) yet, but I likely never will as there's "just" 500 watts going into it, and between it and my Captivator, I have a lot of output, period.

I honestly haven't noticed anymore extension from it (over my Cap), but let's get real: how much music has content much under 20hz (no, I don't listen to the shockingly bad "bass-head" and dub step garbage...yeah, even the "good" dub-step, lmao).

I have my BD demo disc though so I'm going to go through some of the standard toture tests tonight and see what happens. So far I'm very impressed and I'm very happy my cabinet is more inert than I thought it would be.

I shall return.

James

Actual phone call (see pic to left):

 

Tech (responding to laughter): "I'm sorry sir, did I miss something?"

Me: "Yeah, a case of Diet Mountain Dew walking across my living room."

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post #190 of 195 Old 10-29-2012, 09:23 AM
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Gotta watch movies (not music) with good bass extension. Start with the bass waterfall thread and check out the 5 star movies that aren't the Avengers.

wink.gif

tongue.gif


But seriously, you're lower limit is basically held by your Cap which is tuned to 15hz, yes? You'll need more sealed subs with no filters in place to really notice, I think. A single medium powered 18" isn't going to do it all by itself.

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

 

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post #191 of 195 Old 10-29-2012, 12:24 PM - Thread Starter
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I thought I just said I was going to do precisely that, lol?

I don't need 130db 8hz bass. Already experienced it on a few systems and it's simply not a worthwhile goal to chase in my estimation when you consider the monetary and physical space requirements...never mind the sheer relative lack of content out there. Yeah, I know people can name 2 dozen movies containing significant sub 10 hz content, now contrast that against the total number of films available, never mind ones you actually want to watch, lmao. But I digress.

Music is important to me so I want the sub to perform well in that regard and I'm happy to report that it has, thus far.

I own dozens of movies with absurdly low extension...many of them on my demo disc so I'll have a good idea later.

James

Actual phone call (see pic to left):

 

Tech (responding to laughter): "I'm sorry sir, did I miss something?"

Me: "Yeah, a case of Diet Mountain Dew walking across my living room."

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post #192 of 195 Old 11-01-2012, 06:40 PM - Thread Starter
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Ok, went through a LOT of the low-end staples tonight: FOTP, WOTW, Cloverfield, Hulk, U571, etc.

What a performer as far as I'm concerned.

I was clipping the 500 watts coming out of the Crown and I never heard a foul sound out of it. Very controlled, actually. I thought the WOTH at "0" on the dial would surely put it in the danger zone, but again, I was almost certainly out of gas, amp side, at that point.

Excellent, excellent, though when you consider the $300 price tag.

I will admit that my entertainment stand that's really currently serving as the worlds largest center channel stand could be removed for a 7 foot long, 2,000 watt 16^3 quad-drivered cab for $1000. biggrin.gif

Crickey, talk about output potential.

So throw a 500/1000 watt plate amplifier in the cabinet and I don't know how you could beat it for $450-$500 all day, anywhere near the size, honestly.

James

Actual phone call (see pic to left):

 

Tech (responding to laughter): "I'm sorry sir, did I miss something?"

Me: "Yeah, a case of Diet Mountain Dew walking across my living room."

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post #193 of 195 Old 11-02-2012, 04:46 AM
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Quote:
Originally Posted by mastermaybe View Post

Ok, went through a LOT of the low-end staples tonight: FOTP, WOTW, Cloverfield, Hulk, U571, etc.
What a performer as far as I'm concerned.
I was clipping the 500 watts coming out of the Crown and I never heard a foul sound out of it. Very controlled, actually. I thought the WOTH at "0" on the dial would surely put it in the danger zone, but again, I was almost certainly out of gas, amp side, at that point.
Excellent, excellent, though when you consider the $300 price tag.
I will admit that my entertainment stand that's really currently serving as the worlds largest center channel stand could be removed for a 7 foot long, 2,000 watt 16^3 quad-drivered cab for $1000. biggrin.gif
Crickey, talk about output potential.
So throw a 500/1000 watt plate amplifier in the cabinet and I don't know how you could beat it for $450-$500 all day, anywhere near the size, honestly.
James

How low do you think this sub will go? How does it compare in terms of extension and output to the Cap that you already have?
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post #194 of 195 Old 11-02-2012, 05:53 AM - Thread Starter
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^ Hard to say re how low it will go. I currently have a 12hz HPF on it, which I think really starts cutting ~20hz unfortunately, but I'm not really wanting for much extension thus far. I'd guess I'm getting meaningful stuff to the 13-15hz neighborhood.

The Cap has a 2 kilowatt amplifier attached to it with 30mm of excursion in a cab tuned to 15z. It's output surely surpasses it across the board. It's also $2,000 of course.

Again, for $300, I cannot and won't complain, it's a fantastic sub that would prolly do- or "overdo" it for 99% of the populace in most rooms.

James

Actual phone call (see pic to left):

 

Tech (responding to laughter): "I'm sorry sir, did I miss something?"

Me: "Yeah, a case of Diet Mountain Dew walking across my living room."

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post #195 of 195 Old 11-02-2012, 06:15 AM - Thread Starter
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I'm sure once this driver sees a bona fide test with measurements we'll have much more definitive answers, but I'd say for $250 it's a homerun.

James

Actual phone call (see pic to left):

 

Tech (responding to laughter): "I'm sorry sir, did I miss something?"

Me: "Yeah, a case of Diet Mountain Dew walking across my living room."

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