Type-E ’s aren’t as weak as you think!
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=32010
Printed Date: July 18, 2025 at 7:22 PM
Topic: Type-E ’s aren’t as weak as you think!
Posted By: Alpine Guy
Subject: Type-E ’s aren’t as weak as you think!
Date Posted: May 11, 2004 at 9:00 PM
Many of you may think that the Alpine type-E subs are just cheepo subs that don't put out that much, and can't handle to much, but, in my fun test today i discovered that these lil subs broke our shop record for lasting the longest plugged directly into the wall!!!:D A lil E-10" lasted 3min 30 seconds of continuous 120v open air, inverted on the floor, , and its still functional!!!! It got a lil stinky so we stoped hehe. It beat the previous record holder, , the R-15 haha by a wopping 15 seconds, lol. And the shortest lasting sub was a clarion 15" at 13 seconds haha, crappy clarion! ------------- 2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Replies:
Posted By: flatulatta
Date Posted: May 11, 2004 at 9:02 PM
umm... wow..... do yall get that bored at your shop or is it to show your customers?
Posted By: stevdart
Date Posted: May 11, 2004 at 9:05 PM
You guys kill me. That is funny!
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: Alpine Guy
Date Posted: May 11, 2004 at 9:11 PM
when a moron scratches our display subs, or a drill slips,,,oops, , , , , we have fun then sender back for some A#1 alpine warranty  ------------- 2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Posted By: flatulatta
Date Posted: May 11, 2004 at 9:19 PM
wow... can we say major BORDOM!!! i wish i could own a shop to do stupid stuff like that.... is there like a way to see how many watts the was getting like the same thermal intensity as??
Posted By: Alpine Guy
Date Posted: May 11, 2004 at 9:30 PM
id imagine theres a way to measure, ,but that would take the fun away, lol
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2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Posted By: haemphyst
Date Posted: May 11, 2004 at 9:45 PM
(Dave raises his hand) Were they 8 ohm, or 4 ohm? DVC (series or parallel wiring) or SVC? I ask because this will make a HUGE difference in how much power they were actually getting... (This sounds like something I used to do at the Radio Shanty where I used to work... THAT was a good time, only I used to put 'em back in the box BWAHAHAHA!)
To wit:
120 vRMS times 1.414 = 170 v p-p
now the rule is p-p voltage squared, divided by 8 divided by the load
170 times 170 = 28900/8 = 3612/16 = 225 watts
170 times 170 = 28900/8 = 3612/8 = 451 watts
170 times 170 = 28900/8 = 3612/4 = 902 watts
170 times 170 = 28900/8 = 3612/2 = 1804 watts
Even if they were 8 ohm, SVC drivers, the power the VC would actually be getting is 450 watts, which I will grant you is probably a lot more than the driver is rated for, but the voltage from the wall IS TRUE sine wave, and NEVER clipped. (See what we have been saying about clipping?) Also the EXTREME excursions made by this kind of power running into a free air woofer, will cause a tremenous cooling effect on the voice coil, so even at twice the power, I am impressed, but not as impressed as I should be, I think. I watched an Eclipse Titanium 10, voice coils paralleled, for a two ohm load, (1800 watts) run for three days CLAMPED TO THE BENCH, CONE DOWN, and still did not blow. TAHT was worth the effort! The magnet structure was so hot you could not touch it, and the shop stunk to high heaven! Ahhh, those were the days...
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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: Alpine Guy
Date Posted: May 11, 2004 at 10:16 PM
it was a single 4 ohm sub, , , , its still not blown, , , we just stopped it at the smoke point . So whats the big bad math on that? i got confused there/
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2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Posted By: flatulatta
Date Posted: May 11, 2004 at 10:24 PM
like not blown as in still play alright??? wow thats amazing.... lol
Posted By: Alpine Guy
Date Posted: May 11, 2004 at 10:40 PM
whell, , it makes popping noises at the peak , , , but its still not completely melted to the point where it just dosn't work anymore, , ,, i may take it outside tomorrow and finish it off  ------------- 2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Posted By: Steven Kephart
Date Posted: May 11, 2004 at 11:02 PM
Hey haemphyst, I'm a little confused about your equations you are using. Why are you dividing twice? The formula should be P=E^2/R. But where are you getting the 8 from? I ask this because I think your numbers are too low. I asked my boss if I could plug our Parthanon subwoofer into the wall. He told me that it wouldn't take it. Of course it does have an efficiency of around 97 dB. But with two sets of 8 layer voice coils, and them being so exposed to outside air, it should be able to handle trememdous amounts of power. This was even when I suggested wiring the 4 2 ohm voice coils in series. I don't think the problem was mechanical excursion as it can move 3" of linear one way. Steven Kephart Adire Audio -------------
Posted By: Alpine Guy
Date Posted: May 11, 2004 at 11:10 PM
your boss was probably afraid of it fireing up like a rocket and going through the ceiling, hahaha
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2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Posted By: Ravendarat
Date Posted: May 11, 2004 at 11:28 PM
I used a 15 z series RF a couple days ago and I got about 1 min 10 sec outta it. Someone had kicked in the dust cap and I wanted to make sure they didnt send it back to us so I made the thing smoke. So wrong but so much fun. If you wanna have real fun, we took 8 pioneer 12" subs and hooked them up in 2 ohm total and hooked them up to the wall but we had all of them in ported boxes so It just wailed. Man that was fun, thats what happens when you are an installer and am forced to set up for boxing day. We set up alright. We had the whole thing hooked up to a surge bar and used the switch to run burst threw the wall all day. That was definatly an attention getter.
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double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer
Posted By: haemphyst
Date Posted: May 11, 2004 at 11:34 PM
P=E^2/R is a correct formula, but those numbers are based on the RMS voltage, and give peak power...
ex:
120*120=14400/4=3600 watts PEAK
To figure p-p voltage, multiply RMS voltage by 1.414
P=E(p-p)^2/8/R is the formula to give continuous power...
120*1.414=169.68*169.68=28791.3024/8=3598.9128/4=899.7282 watts RMS
This is the way I have always done it... (Because this is the way I remember it from my Navy Electrician's Days) I like the RMS numbers better than peak numbers.
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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
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