05 limited roadster- Plenty of bass from doors and tone controls working but little sound from rear speakers. I have to place my head behind each seat to hear the rear speakers while door speakers are at medium output. I read the 220uf door filter thread and have some ordered. I am preparing for the possibility that filtering the bass from the door will leave me with almost no bass at all.

Is the low rear speaker volume normal or do I have a possible amp problem?
Does the capacitor increase bass from rear speakers by only allowing the radio output to be increased?
Rear speakers appear powered. How is the total system power (240w) distributed?

 

This mod will drastically increase the output from the subs behind the seats.

What you are experiencing is normal for these cars.

You will actually INCREASE bass, but not through the doors-they were not meant to reproduce low freq's anyways.

 

the rear speakers are just subs

 

maxcichon- which mod are you talking about? (sorry if I'm over-looking something)

 

Initially, I was highly disappointed with my radio and figured that the amp was blown. Even with my ear right up against the sub speakers (knowing that they were ONLY subs), still, I literally could not hear a thing from them. I had precisely the same issue that you are finding. If you follow the instructions for the Biggest stereo bang for the buck mod , you will be VERY PLEASED with the results.

I am now very happy with the improved volume and the bass. I was lucky enough to have had the guidance of this forum's Senior Member, OneHundred80, in doing the modification. Getting the capacitors installed takes about 10 minutes per door if you are not rushing. As was recommended to me, make sure (when you button everything up), that what you just installed won't rattle around inside/against the door. It would be a minor waste of time to one day have to take it apart in search of a rattle that could have been prevented in the first place. You'll know what I mean when you do it.

It seems as is you've already found Pelked's highly recommended mod so now, you just need to get a small slotted driver to pry with, the capacitors, some side-cutters, some electrical tape and a couple of marrettes and you'll be "rockin in the free world", as fellow Canadian Neil Young likes to say!

Once you see how happy you are with your radio, take a look at your on-deck circle. You'll now be smitten with the idea of buying a Nav radio on the net and purchasing Rudy's fully controllable iPod/iPhone/USB Drive/Aux input modification! iPod Control with Factory Nav Radio is Here! How could you pass up an improvement like this one? Come on summer!

 

Sorry! See the post above. The link to the sticky is there.

 

I played a audio frequency cd in 10hz steps from 10 to 200. Her are my observations. I should mention that I have old, very old, ears and hearing to match.

Rear speakers.
I begin to hear at them at 30hz.
Volume peaks at 110 right 120 left.

Door speaker-
Low frequency response is equal in frequency and slightly higher in volume.

Conclusions.
I do not believe that adding filter to door speakers increases the power to or output from the rear woofers but the increase in loudness is due to the reduction in phase cancellation. If phase cancellation is an issue, wouldn't you think the engineers would have addressed it.

Here where I need advice. Since the woofer peaks at 110-120 is this technically the frequency for the filter?
Is there any gain to be had by using a 12db crossover/filter on the door speakers?

 

The stock Infinity amp is a 6 channel amp. It produces 6 x 22 Watts at 4 ohm.
It has a primitive built in processor and a x-over for the subs.

2 channels go to the door mid woofers and tweeters.
The tweeters have little capacitors to prevent them from low frequencies.

4 channels go to the 2 subs, which are double coil speakers.
Don't expect too much. They are just 6.5". But they are not too bad.

Concerning the cap solution, please take a look at this:
https://www.crossfireforum.org/forum...tml#post570038

If you only use a cap for a volume lowering this will cause distortion at higher volume levels, because of impedance peaks.
The caps won't incerase the volume of the subs. They decrease the volume at a defined frequency.

Regards
Markus

 

Sorry, but this is extremely untrue.

Adding capacitors meerly filters frequencies out so there is less distortion. It does nothing for power output.

Now, you might be able to increase bass with less distortion, but in no way will you be making any more bass then you could before.

 

6 channel with 4 to the subs. I thought I read that the subs were powered.

Was not thinking the caps could increase volume but if a sharper cutoff or 180 phase shift would be of any advantage.

Thanks.

Now where is that ups guy with my 330s....I am too pleased with the XF to modify anything else.

 

"Untrue" is an absolute. It cannot be modified.

But, you are technically correct. I should have written:

It will SEEM as though there is more bass. Less from the doors and more from the subs.

There. Better?

 

All About Bass Blockers

 

Sorry, I agree with everything Max says as he is a big bugger and I would hate to upset him.

 

Age and experience. Good looks and a proper attitude got me where I am today.

Stuck in a podunk town on the east edge of one of the most backwards states in the Union. I'm paid enough to keep me here. Just.

Dave, don't fear me-cry for me?

 

This was all a very long time ago.... But when searching for an answer for my problem, this title describes it best.
Only, I am not looking for a mod, but have a problem with resetting the user menu's 1, 2 & 3 to linear, loosing all of the power. As it seems the power from the subs is lost, somehow.
With the 'aud' I can increase the Bass to max without it coming close to what it was before I reset it to linear. Before I did, I only had to increase the Bass to +3.
It feels like there's some Loudness setting lost? I RTFM, but it doesn't say anything about a loudness setting, or (de-)activating the subs.
Any suggestion?

 

Finally found it out myself.
By removing the corresponding fuse, removed power from the radio which then is reset after powering on again. The volume (power) at the subs is back. Double checked by setting one of the User menu's to Linear again. What a difference! I wonder why this isn't in the manual: when set to Linear, you cannot get the original setting back.
I suspect this initial setting is factory tailored for the proper sound balance. And we might not even need this mod ...?

 

A lil cornfumed here, just what fuze and how did you do what? Help an old guy out here will ya?

 

Actually quite simple, in the fuse box in the engine compartment, just remove all Radio related fuses. There were 3 in mine (2005 Roadster). 2 for Radio, and 1 for amplifier (sort of).
I removed them, turned the key for contact (no need to start engine), turned if off again, replaced all fuses, and done!

 

subscribed

 

Aha! Did the AUD reset thing. Did the Fuse thing (used the chart under the FUSE box lid to find the 3 fuses, being 8 & 30 for the Radio, and 23 for the Sound Booster, with all at 15Amps). Rear speakers do work but hard to hear. With Bass to its top limit, with volume way up, feel wind burst from the speaker hole. Sound from the door speakers definitely interferes with anything from the subs. Next task is to CAP the door speakers. Wondering if the 6.5 door speakers feed the twitter, meaning will not have to cap the twitter as well. Any info hear would be appreciated. Suggested CAP Hz as well. 300?? Thanks, Lemon Twist.

I removed and replace the three fuses with the ignition on and off in the middle. No effect and am thinking it may have something to do with the "linear" thing. What is this "linear" setting and how is it achieved, assuming it resets something? Have a 2005 Limited, Yellow, Stick trans, radio has Nav, CD of course. All else works fine except the rear speakers with the doors seemingly pushing out too much bass.

Help would be appreciated. Thanks.