Subs in premium sound question?

Technic · 10-23-2008, 07:02 PM

Quote:

Originally Posted by jlaw

Awesome, eagerly awaiting the results.

Did you order new OEM enclosures to modify or did you cut up the factory ones?

I cut out the plastic ribs inside the enclosure to allow the SWS-8 to be fully installed without any gasket.

This mod is totally reversible as the OEM connectors were replaced/combined with Molex connectors and the silicone can be cut and the SWS-8 removed.

Technic · 10-23-2008, 07:06 PM

Quote:

Originally Posted by kyoshozx

What amp are you using to drive these?

I'll be using a PDX 4.150 in 3-channel mode for these pair of SWS-8, with a undecided trunk sub. A PDX4.100 will drive the rest of the OEM 4" component and coaxial sets (they are 4 ohms). I don't feel that they need replacement at all, just a custom tuning.

808MGuy · 10-23-2008, 07:33 PM

Quote:

Originally Posted by Technic

I'll be using a PDX 4.150 in 3-channel mode for these pair of SWS-8, with a undecided trunk sub. A PDX4.100 will drive the rest of the OEM 4" component and coaxial sets (they are 4 ohms). I don't feel that they need replacement at all, just a custom tuning.

So you're using these as midbass drivers not subs. How do you think they would work out as strictly subs? I know it's would be hard to say until how hook up an aftermarket amp but that's what I had in mind.

Technic · 10-23-2008, 07:43 PM

Quote:

Originally Posted by HIS4

So you're using these as midbass drivers not subs. How do you think they would work out as strictly subs? I know it's would be hard to say until how hook up an aftermarket amp but that's what I had in mind.

In my previous installation I had those SWS-8 set from 35Hz to 250Hz, so they can "mimic" a small sub very well. There is distortion/complaints below 35Hz...

My plan is to do the same in this Premium Audio setup, and let the 4" drivers handle everything above 250Hz. The center speaker will be filtered by a CDT CenterStage CS-256 crossover at 500Hz @-11db connected in parallel with the front speakers. I want less center speaker "presence" than what the OEM amp processing is doing now.

d_dot · 10-23-2008, 09:05 PM

Is there any speakers other than the sws8s that can b used under the seat as deep subs so that I won't have to put nething in the trunk?

spectrumphoto · 10-24-2008, 05:47 AM

I'd be very interested in install pics when you swap out the amp for the 2 sws subs. I am assuming that you will have to run new wiring for the amp.

did you re-affix the sub covers under the seat? If so, how so that the sws travel does not hit it?

In the past I have just thrown in a 10" JL wedge with a JL monobloc amp to give better low end, but if these SWS 8s are adding a little more umph I'd much rather keep the trunk space and OEM look.

Technic · 10-24-2008, 10:40 AM

Quote:

Originally Posted by d_dot

Is there any speakers other than the sws8s that can b used under the seat as deep subs so that I won't have to put nething in the trunk?

So far, any other shallow sub will require, in the best case a deeply modified OEM enclosure, or a completely custom enclosure in the worst case.

IMO, the SWS-8 in the OEM enclosure -when properly driven by an 150W RMS per channel aftermarket amp- is the best compromise and OEM solution. It really goes deeper and stronger in the bass notes as it seems that it fully take advantage of the OEM enclosure door sill ducts with its longer throw cone movement. Even driven with the Premium OEM amp the sound/bass difference is immediate.

Earthquake already came up with a 2 ohms SWS-8 for direct replacement of the standard/base M3 sound system, so I hope that it is just a matter of time that they also can come up with a direct-replacement 7 ohms version for the Enhanced Premium Sound.

Technic · 10-24-2008, 10:51 AM

Quote:

Originally Posted by spectrumphoto

a) I'd be very interested in install pics when you swap out the amp for the 2 sws subs. I am assuming that you will have to run new wiring for the amp.

b) did you re-affix the sub covers under the seat? If so, how so that the sws travel does not hit it?

In the past I have just thrown in a 10" JL wedge with a JL monobloc amp to give better low end, but c) if these SWS 8s are adding a little more umph I'd much rather keep the trunk space and OEM look.

a) The OEM amp in the Enhnced Premium Audio cannot be replaced, as it is a digital inputs amp. So what I'm doing is using a Cleansweep and summing module to recreate and de-EQ the OEM amp output signal and then use a DQXS processor to create my own, separate EQ curves for the front, rear, underseat woofers and undetermined trunk sub before hitting the PDX amps.

Personally, I don't like at all so many D/A conversions, but there is no way so far in the USA to change the outputs of the OEM HU/iDrive CCC from digital to analog, as it can be done in Europe, to be able to totally bypass the OEM amp and its filtering and processing.

b) I did not re-install the covers because of that reason.

c) I'm sure that there will be more and stronger bass in the SWS-8 once I power them with the PDX 4.150 and tune them with the DQXS. For the OEM look, up to 3 PDX amps can be stacked (with a custom-made bracket) on top of the OEM amp when the OEM CD changer trunk trim is used. The CD Changer access door is conveniently positioned to have access to all the gain/filter control of all 3 posible PDX amps.

So done right, no aftermarket equipment will be visible in the trunk.

d_dot · 10-24-2008, 05:59 PM

Quote:

Originally Posted by Technic

a) The OEM amp in the Enhnced Premium Audio cannot be replaced, as it is a digital inputs amp. So what I'm doing is using a Cleansweep and summing module to recreate and de-EQ the OEM amp output signal and then use a DQXS processor to create my own, separate EQ curves for the front, rear, underseat woofers and undetermined trunk sub before hitting the PDX amps.

Personally, I don't like at all so many D/A conversions, but there is no way so far in the USA to change the outputs of the OEM HU/iDrive CCC from digital to analog, as it can be done in Europe, to be able to totally bypass the OEM amp and its filtering and processing.

b) I did not re-install the covers because of that reason.

c) I'm sure that there will be more and stronger bass in the SWS-8 once I power them with the PDX 4.150 and tune them with the DQXS. For the OEM look, up to 3 PDX amps can be stacked (with a custom-made bracket) on top of the OEM amp when the OEM CD changer trunk trim is used. The CD Changer access door is conveniently positioned to have access to all the gain/filter control of all 3 posible PDX amps.

So done right, no aftermarket equipment will be visible in the trunk.

Well im totally lost so I hope u will have a full DIY after this all said and done cause i need to upgrade my sounds asap.

GT3 Tim · 10-27-2008, 12:36 PM

Quote:

Originally Posted by d_dot

Well im totally lost so I hope u will have a full DIY after this all said and done cause i need to upgrade my sounds asap.

+1 LOL

10-23-2008, 09:05 PM	#49
d_dot 4 * General 56 Rep 644 Posts Drives: F12 M6,Audi R8 Lambo Gallardo Join Date: Dec 2007 Location: Tri-State iTrader: (0)	Is there any speakers other than the sws8s that can b used under the seat as deep subs so that I won't have to put nething in the trunk? __________________ Nissan GT-R (Sold) E92 M3 + 335 (sold) F10 535 (sold) When Driving Nice Whips It Helps To Have Nice Kix!
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10-24-2008, 05:47 AM	#50
spectrumphoto Just another peanut in the Turd! 92 Rep 598 Posts Drives: g16M850;f30M550;f80M3-ED;e90M3 Join Date: Aug 2008 Location: Hollywierd, SoCal iTrader: (2)	I'd be very interested in install pics when you swap out the amp for the 2 sws subs. I am assuming that you will have to run new wiring for the amp. did you re-affix the sub covers under the seat? If so, how so that the sws travel does not hit it? In the past I have just thrown in a 10" JL wedge with a JL monobloc amp to give better low end, but if these SWS 8s are adding a little more umph I'd much rather keep the trunk space and OEM look.
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