Logic7 SWS-8 Underseat Sub Upgrade FAQ

quality_sound · 10-12-2010, 10:24 AM

Keep the OEMs for midbass use. Just BP them at 0Hz and 200Hz and call it a day. You could go as high as roughly 250Hz if your 4s can't handle 200Hz.

kaigoss69 · 10-12-2010, 10:48 AM

Quote:

Originally Posted by quality_sound

Keep the OEMs for midbass use. Just BP them at 0Hz and 200Hz and call it a day. You could go as high as roughly 250Hz if your 4s can't handle 200Hz.

Do you know which audio system he has? Yes, the L7 woofers make pretty good midbass drivers, but not so much the HiFi woofers, and no way in hell can you use the base audio woofers in any kind of quality aftermarket system.

fdriller9 · 10-12-2010, 12:23 PM

Quote:

Originally Posted by quality_sound

Keep the OEMs for midbass use. Just BP them at 0Hz and 200Hz and call it a day. You could go as high as roughly 250Hz if your 4s can't handle 200Hz.

This is exactly what I have right now. I just updated this thread with some more info/a little editing.

I'm running my stock L7 woofers off an MRP-M500, 75W @ 8Ohms. I didn't want to risk wiring them down to 2Ohms, 250W! I wasn't sure if the woofers would be able to handle that much power. I have them bandpassed between 150Hz and 65Hz. I want to swap my M500 for an F300 so I can have them at 150W @ 4ohms, in stereo too. But noone wants to trade

Playing them down to 0Hz would be the same as not setting any filters on your amps. The signal in the L7 system is actively low-passed around 150Hz and anything below around 26Hz, humans can't really hear. Not sure if you meant to put 0Hz....

VP Electricity · 10-12-2010, 12:35 PM

I would still HP the L7 woofers somewhere above 0.

Remember, 1 octave lower at the same output is 4x the excursion.

The converse would be, if you high pass the lowest octave out of the L7 woofers, your maximum volume without exceeding xmax would increase dramatically.

quality_sound · 10-12-2010, 02:14 PM

Quote:

Originally Posted by kaigoss69

Do you know which audio system he has? Yes, the L7 woofers make pretty good midbass drivers, but not so much the HiFi woofers, and no way in hell can you use the base audio woofers in any kind of quality aftermarket system.

Yes you can. Ask Ken how many times he's done it. In fact, he could have easily sold me new midbass drivers to go with the other drivers I bought from him and HE suggested it to me. Also, listening to them, midbass is all they do well.

quality_sound · 10-12-2010, 02:15 PM

Quote:

Originally Posted by *********

This is exactly what I have right now. I just updated this thread with some more info/a little editing.

I'm running my stock L7 woofers off an MRP-M500, 75W @ 8Ohms. I didn't want to risk wiring them down to 2Ohms, 250W! I wasn't sure if the woofers would be able to handle that much power. I have them bandpassed between 150Hz and 65Hz. I want to swap my M500 for an F300 so I can have them at 150W @ 4ohms, in stereo too. But noone wants to trade

Playing them down to 0Hz would be the same as not setting any filters on your amps. The signal in the L7 system is actively low-passed around 150Hz and anything below around 26Hz, humans can't really hear. Not sure if you meant to put 0Hz....

Oops, that should have been 60Hz.

808MGuy · 10-12-2010, 02:35 PM

Quote:

Originally Posted by quality_sound

Yes you can. Ask Ken how many times he's done it. In fact, he could have easily sold me new midbass drivers to go with the other drivers I bought from him and HE suggested it to me. Also, listening to them, midbass is all they do well.

I agree that the hi-fi woofers are more than capable of midbass. The 6" base audio drivers, probably not so much.

joelc73 · 10-16-2010, 10:35 PM

Hi all, I have a quick question. Do I need spacers between the SWS and the speaker grill itself? My installer made custom ones for between the enclosure and the speaker but didn't put anything between the speaker and the grill. Reading other install threads it seems like I might need them but I'm not sure...

fdriller9 · 10-17-2010, 10:40 AM

If your speaker is touching the grill/carpet I would put a spacer in...you can also just cut the carpet or leave the grill off.

I had mine folded back by making a few slits on the sides of the carpet and left the grill off. Just make sure nothing gets on top of the cone...it could damage it.

joelc73 · 10-17-2010, 11:49 AM

Quote:

Originally Posted by *********

If your speaker is touching the grill/carpet I would put a spacer in...you can also just cut the carpet or leave the grill off.

I had mine folded back by making a few slits on the sides of the carpet and left the grill off. Just make sure nothing gets on top of the cone...it could damage it.

Thanks man!

taibanl · 10-17-2010, 08:32 PM

Quote:

Originally Posted by kaigoss69

Do you know which audio system he has? Yes, the L7 woofers make pretty good midbass drivers, but not so much the HiFi woofers, and no way in hell can you use the base audio woofers in any kind of quality aftermarket system.

I have only the Base Audio so I'll need to buy something.

I can get SSMB8's for ~160. Would this be preferable to a SWS8? (and as posted previously this is for a midbass solution with a Sub-Bass setup in the trunk.

quality_sound · 10-18-2010, 02:42 AM

Yes, use the SSMB8 over the SWS for midbass use.

808MGuy · 10-18-2010, 03:38 AM

Quote:

Originally Posted by quality_sound

Yes, use the SSMB8 over the SWS for midbass use.

Are the SSMB8 drivers drop in as far as the OEM enclosures go or does it require slight modification?

taibanl · 10-18-2010, 12:02 PM

Quote:

Originally Posted by 808MGuy

Are the SSMB8 drivers drop in as far as the OEM enclosures go or does it require slight modification?

Per Technic, I know they at least require a 1/2 spacer and perhaps more modification.

quality_sound · 10-18-2010, 12:03 PM

Spacers should be enough.

tomob63 · 01-22-2012, 03:39 PM

Just traded my HiFi LCI E90 for one with Logic 7.

Believe I am toast in using the SWS-8xi's (2) ohms, so no go

Up for sale they go.

If anyone knows if I can keep them , please PM me.

taibanl · 01-22-2012, 03:49 PM

Quote:

Originally Posted by tomob63

Just traded my HiFi LCI E90 for one with Logic 7.

Believe I am toast in using the SWS-8xi's (2) ohms, so no go

Up for sale they go.

If anyone knows if I can keep them , please PM me.

Toast? What? What are you saying

tomob63 · 01-22-2012, 03:57 PM

I am not able to use these new SWS subs as I now have Logic7 and have read up that:

1. If I was to use them, I'd need 4ohm
2. The set up already in there (Logic 7) is pretty good, you're not going to get much more punch out of the Earthquakes

True?

I'd love to keep em' as they really woke up the HiFi system.

gIzzE · 01-22-2012, 04:07 PM

You need the 2ohm ones if using them with the L7 amp, that was what the 2ohm version was designed for.

tomob63 · 01-22-2012, 04:17 PM

im confused then. will research more, before I list on these on the forum.

The earthquakes have to give some improvement to the L7, but I'm positive I read that the impedance needed to be 4 ohm.

Thanks for your help though.

gIzzE · 01-22-2012, 04:38 PM

The factory woofer is a 4ohm woofer, however Earthquake released the SWS8-xi (2 ohm) to be a direct replacement for the factory systems.

I guess the amp puts out more power with a 2 ohm load and drives them properly?
I know when we tried the 4ohm ones in mates car a few years back running of the L7 amp they were not loud enough, he ended up adding an amp to drive them properly.

I know people who have put the 2 ohm ones in and run it off the L7 amp and said that it is fine, but I have never heard them.

I would give it a go and see what you think.

The Extremely Versatile SWS Subwoofers

The SWS-8XI by Earthquake Sound features a mounting depth of 2-1/8". With a depth this small the applications for this woofer are endless. This shallow-woofer-system series subwoofer is perfect for those with limited space but that still want some bass in their car. This woofer is also the perfect replacement for factory upgraded systems, especially BMW vehicles. The woofer features a light weight resistant PVC cone and a long-lasting UV treated high-roll composite foam surround for added rigidity, stiffness, longevity and increase power output and performance. Don't let the size of the woofer fool you into thinking it's not powerful, with an Xmax linear excursion of 23mm this woofer will hit low-frequencies with accuracy and precision for a clean, crisp, and responsive bass reproduction. Although often imitated the SWS's 3 protected U.S patents assure that it's never duplicated. If you have 2.5" of space to spare then there is no other option than the SWS series subwoofer.

Subwoofer Features:

8" Shallow Mount 2 Ohm Subwoofer
Power Handling:
Peak: 300 watts
RMS: 150 watts
Impedance: Single 2 Ohm
Long lasting, UV treated high-roll composite foam surround
Fits the factory BMW bolt pattern
Perfect replacement for factory upgraded systems
Easy 8" door-mount
Easy under-seat mount
First in-dash mount
Excellent for rear-deck mounting
1.5" Voice coil
Aluminum bobbin
Mounting depth: 2-1/8"
Xmax: 23.00 mm
Sensitivity: 86.7 dB
Authorized Internet Dealer
5-year Manufacturer's warranty
[b]Note: The 2-Ohm SWS-8XI is for factory upgraded vehicles only.[b]

taibanl · 01-22-2012, 04:47 PM

With L7, the earthquakes (2 OR 4 ohm) are not much better without additional power.

I haven't tried so no firsthand knowledge.

10-12-2010, 10:24 AM	#45
quality_sound 8 tracks of madness 64 Rep 2,735 Posts Drives: Slowly Join Date: Jun 2009 Location: At home iTrader: (1)	Keep the OEMs for midbass use. Just BP them at 0Hz and 200Hz and call it a day. You could go as high as roughly 250Hz if your 4s can't handle 200Hz.
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10-12-2010, 12:35 PM	#48
VP Electricity Brigadier General 294 Rep 3,201 Posts Drives: F34 xDrive Join Date: Jan 2008 Location: portland oregon iTrader: (3)	I would still HP the L7 woofers somewhere above 0. Remember, 1 octave lower at the same output is 4x the excursion. The converse would be, if you high pass the lowest octave out of the L7 woofers, your maximum volume without exceeding xmax would increase dramatically.
	Appreciate 0 Quote

10-16-2010, 10:35 PM	#52
joelc73 Private First Class 7 Rep 109 Posts Drives: 2010 E90 Join Date: Mar 2010 Location: NY iTrader: (0)	Hi all, I have a quick question. Do I need spacers between the SWS and the speaker grill itself? My installer made custom ones for between the enclosure and the speaker but didn't put anything between the speaker and the grill. Reading other install threads it seems like I might need them but I'm not sure...
	Appreciate 0 Quote

10-17-2010, 10:40 AM	#53
fdriller9 Banned 260 Rep 7,089 Posts Drives: '06 AW 330xi Join Date: Mar 2009 Location: North Jersey/Philly/NYC iTrader: (4) Garage List 2006 330xi [6.44]	If your speaker is touching the grill/carpet I would put a spacer in...you can also just cut the carpet or leave the grill off. I had mine folded back by making a few slits on the sides of the carpet and left the grill off. Just make sure nothing gets on top of the cone...it could damage it.
	Appreciate 0 Quote

10-18-2010, 02:42 AM	#56
quality_sound 8 tracks of madness 64 Rep 2,735 Posts Drives: Slowly Join Date: Jun 2009 Location: At home iTrader: (1)	Yes, use the SSMB8 over the SWS for midbass use.
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10-18-2010, 12:03 PM	#59
quality_sound 8 tracks of madness 64 Rep 2,735 Posts Drives: Slowly Join Date: Jun 2009 Location: At home iTrader: (1)	Spacers should be enough.
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01-22-2012, 03:39 PM	#60
tomob63 Captain 32 Rep 708 Posts Drives: 2015 335i Join Date: Mar 2009 Location: Illinois iTrader: (14)	Just traded my HiFi LCI E90 for one with Logic 7. Believe I am toast in using the SWS-8xi's (2) ohms, so no go Up for sale they go. If anyone knows if I can keep them , please PM me. __________________ 2015 335i
	Appreciate 0 Quote

01-22-2012, 03:57 PM	#62
tomob63 Captain 32 Rep 708 Posts Drives: 2015 335i Join Date: Mar 2009 Location: Illinois iTrader: (14)	I am not able to use these new SWS subs as I now have Logic7 and have read up that: 1. If I was to use them, I'd need 4ohm 2. The set up already in there (Logic 7) is pretty good, you're not going to get much more punch out of the Earthquakes True? I'd love to keep em' as they really woke up the HiFi system. __________________ 2015 335i
	Appreciate 0 Quote

01-22-2012, 04:07 PM	#63
gIzzE Major General 361 Rep 5,985 Posts Drives: F11 + 997 Carrera S Join Date: Apr 2006 Location: Norfolk, UK. iTrader: (2)	You need the 2ohm ones if using them with the L7 amp, that was what the 2ohm version was designed for.
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01-22-2012, 04:17 PM	#64
tomob63 Captain 32 Rep 708 Posts Drives: 2015 335i Join Date: Mar 2009 Location: Illinois iTrader: (14)	im confused then. will research more, before I list on these on the forum. The earthquakes have to give some improvement to the L7, but I'm positive I read that the impedance needed to be 4 ohm. Thanks for your help though. __________________ 2015 335i
	Appreciate 0 Quote

01-22-2012, 04:38 PM	#65
gIzzE Major General 361 Rep 5,985 Posts Drives: F11 + 997 Carrera S Join Date: Apr 2006 Location: Norfolk, UK. iTrader: (2)	The factory woofer is a 4ohm woofer, however Earthquake released the SWS8-xi (2 ohm) to be a direct replacement for the factory systems. I guess the amp puts out more power with a 2 ohm load and drives them properly? I know when we tried the 4ohm ones in mates car a few years back running of the L7 amp they were not loud enough, he ended up adding an amp to drive them properly. I know people who have put the 2 ohm ones in and run it off the L7 amp and said that it is fine, but I have never heard them. I would give it a go and see what you think. The Extremely Versatile SWS Subwoofers The SWS-8XI by Earthquake Sound features a mounting depth of 2-1/8". With a depth this small the applications for this woofer are endless. This shallow-woofer-system series subwoofer is perfect for those with limited space but that still want some bass in their car. This woofer is also the perfect replacement for factory upgraded systems, especially BMW vehicles. The woofer features a light weight resistant PVC cone and a long-lasting UV treated high-roll composite foam surround for added rigidity, stiffness, longevity and increase power output and performance. Don't let the size of the woofer fool you into thinking it's not powerful, with an Xmax linear excursion of 23mm this woofer will hit low-frequencies with accuracy and precision for a clean, crisp, and responsive bass reproduction. Although often imitated the SWS's 3 protected U.S patents assure that it's never duplicated. If you have 2.5" of space to spare then there is no other option than the SWS series subwoofer. Subwoofer Features: 8" Shallow Mount 2 Ohm Subwoofer Power Handling: Peak: 300 watts RMS: 150 watts Impedance: Single 2 Ohm Long lasting, UV treated high-roll composite foam surround Fits the factory BMW bolt pattern Perfect replacement for factory upgraded systems Easy 8" door-mount Easy under-seat mount First in-dash mount Excellent for rear-deck mounting 1.5" Voice coil Aluminum bobbin Mounting depth: 2-1/8" Xmax: 23.00 mm Sensitivity: 86.7 dB Authorized Internet Dealer 5-year Manufacturer's warranty [b]Note: The 2-Ohm SWS-8XI is for factory upgraded vehicles only.[b]
	Appreciate 0 Quote

01-22-2012, 04:47 PM	#66
taibanl Brigadier General 281 Rep 4,121 Posts Drives: BMW Join Date: Sep 2010 Location: NA iTrader: (4)	With L7, the earthquakes (2 OR 4 ohm) are not much better without additional power. I haven't tried so no firsthand knowledge.
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