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Rockwood drivers (Read 7028 times)
Kurtly
Ex Member



Rockwood drivers
10/07/05 at 14:35:51
 
Has anyone used Rockwood 2215's in a Housewrecker?

I recently built a pair and loaded them with 2X Etone 801's each.  While nice and deep, especially compared to the same drivers in a front loaded box, they're not very loud (with 450 watts per box)

If I went to a set of cheapie car 15's would I get more volume?
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60ndown
Ex Member



Re: Rockwood drivers
Reply #1 - 10/07/05 at 15:34:46
 
what is the sensitivity of your drivers?
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Kurtly
Ex Member



Re: Rockwood drivers
Reply #2 - 10/07/05 at 23:05:23
 
I have no idea, I pulled them out of some early 80's full range bins.  A fairly thorough google search turned up little information on them.  They're a 250watt 15, even when being driven hard the cone barely appears to move so I guess they don't really move much air.

If the cheapo drivers are no good then I'll go with P.Audio neo15lf or Eminence Kappa Pro 15lf (both close to 100db from memory)
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« Last Edit: 10/07/05 at 23:05:45 by Kurtly »  
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60ndown
Ex Member



Re: Rockwood drivers
Reply #3 - 10/08/05 at 15:24:41
 
i would try the drivers you already have. they might work very well?
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J_Rock
Ex Member



Re: Rockwood drivers
Reply #4 - 10/08/05 at 19:50:54
 
build it and throw em in, if they work they work, if they don't then you can buy those others.
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Kurtly
Ex Member



Re: Rockwood drivers
Reply #5 - 10/09/05 at 13:51:20
 
Sorry I must have been unclear in my original post...

I have built two housewreckers, they have etone 801's in them now.  They sound good, and very deep, but not as loud as I had hoped they would.

Will cheap long exceursion drivers be louder than better quality short excursion ones?
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60ndown
Ex Member



Re: Rockwood drivers
Reply #6 - 10/09/05 at 15:14:07
 
higher sensitivity drivers are louder than lower sensitivity drivers -on the same amp.

or


a bigger amp.

are long excursion drivers louder than short excusion drivers?
im not sure?? but i bet dirt dawg gexter j rock or one of dem others knows Grin
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« Last Edit: 10/09/05 at 15:15:13 by 60ndown »  
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J_Rock
Ex Member



Re: Rockwood drivers
Reply #7 - 10/09/05 at 20:52:04
 
sensitivity will be a large impact on how loud you sub will go.  another is how much power you are giving them.  I am gonna assume that you are not changeing amps.  therefore sensitivity = loudness, higher better.  watch the ratings though spl @ 1w/1m is much better than the same rating at 2.83 volts / 1m.  

As far as excursion goes, I am still learning, but it seems higher = better impact in the sub.
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jj420
Ex Member



Re: Rockwood drivers
Reply #8 - 10/13/05 at 23:13:13
 
higher excursion will make the system deeper, as raising the Xmax usually lowers the Fs of the driver.  The trade off (usually) is that higher Xmax drivers lose a lot of linearity in thier cone movement under high wattage conditions, causing "muddy" bass that is not as accurate.  Adire advertises new XBL2 technology that promises higher linearity at higher excursions.

Anywyas, the HWK behaves so differently than most sixth order bandpass boxes that this may not mean a thing.  The airspring, combined with the high cone control of the BP enclosures would likely render this moot.  A higher excursion moves more air, as the entire output of this system is via ports, i would think that, while almost certainly more resounding, there would be a great deal of port noise.  In short smaller Xmax drivers are more forgiving of ports, with a high excursion driver you will need very large flares to prevent audible hiss.

I would try it, but i am not in a position to do so just yet, so its up to you...  enquiring minds want to know!
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DirtDawg
Ex Member



Re: Rockwood drivers
Reply #9 - 10/14/05 at 00:45:50
 
[quote author=J_Rock  link=1128695751/0#7 date=1128887524]watch the ratings though spl @ 1w/1m is much better than the same rating at 2.83 volts / 1m.  

[/quote]

Sorry J_ROCK,  
 
Gotta correct ya here. Do the math. Ohm's law.   
2.83V across an 8 ohm load is 1W  
2V across 4 ohm load is 1W      
1.414V (look familiar?) across 2 ohm load is 1W  
 
So if you're talking about 8 ohm drivers those 2 specs are the same.  
 
If it's a spec using 2.83V across a 4 ohm driver, just subtract 3dB. It's really not a BS spec.  
 
2.83V across 4 ohms is 2W    

 
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« Last Edit: 10/14/05 at 00:46:48 by DirtDawg »  
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60ndown
Ex Member



Re: Rockwood drivers
Reply #10 - 10/14/05 at 16:01:32
 
[quote author=DirtDawg  link=1128695751/0#9 date=1129247150]

Sorry J_ROCK,  
 
Gotta correct ya here. Do the math. Ohm's law.   
2.83V across an 8 ohm load is 1W  
2V across 4 ohm load is 1W      
1.414V (look familiar?) across 2 ohm load is 1W  
 
So if you're talking about 8 ohm drivers those 2 specs are the same.  
 
If it's a spec using 2.83V across a 4 ohm driver, just subtract 3dB. It's really not a BS spec.  
 
2.83V across 4 ohms is 2W    

 
[/quote]

i wonder if i had paid attention at school if i would have better sounding subs? i love it when people know what theyre talking about.me, i just cut the wood and screw it together, and throw in a driver-pray for good results.

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DirtDawg
Ex Member



Re: Rockwood drivers
Reply #11 - 10/14/05 at 18:48:34
 
[quote author=60ndown  link=1128695751/0#10 date=1129302092]

i wonder if i had paid attention at school if i would have better sounding subs? i love it when people know what theyre talking about.me, i just cut the wood and screw it together, and throw in a driver-pray for good results.

[/quote]

If that approach works for you, try to add tithing to the overall plan. That should help, too. Wink
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60ndown
Ex Member



Re: Rockwood drivers
Reply #12 - 10/14/05 at 19:16:24
 
[quote author=DirtDawg  link=1128695751/0#11 date=1129312114]

If that approach works for you, try to add tithing to the overall plan. That should help, too. Wink [/quote]

wtf is tithing?????????????????????????????????????????????????????????????????????????
????????????????????????????????????????????????????????????????????????????????
?????????????????????????????????????????????????????????????????????????????
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boydon_lepasci
Ex Member



Re: Rockwood drivers
Reply #13 - 10/14/05 at 23:09:08
 
That would be a reference to your "...pray for good results". A tithe is one tenth or 10% and refers to giving back some of everything you get to whatever god you believe it came from.
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Hrappur
Ex Member



Re: Rockwood drivers
Reply #14 - 10/15/05 at 00:13:29
 
10% Grin If only that were enough for the taxman too!
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