dazza
Well-Known Member
Thanks Tadda,@dazza
I enjoy listening to EDM that has very deep bass tracks at a volume around 2/3 with subwoofer cover modifications made and I haven't experienced any popping issues or over excursion of woofers ...Below 2/3 volume the bass in my setup is deep and punchy with little distortion and no vibrations to speak of...
Here are my current audio settings:
- ASD / Active Sound Design (off - using Bimmercode)
- Surround (off)
- Speed Volume (0)
- Balance: (0)
- Fade: (front +2)
- Broad Bass (+2)
- Broad Treble (-2)
- Equalizer (shown below)
I saw what you had done originally and aside from some deviations you've made from what I had outlined here in How to Improve OE Subwoofer Quality and Eliminate Vibrations which most likely caused some additional vibrations and distortions (which I go through below), I also believe what you may be experiencing (as a few of us have discovered) is that the OE Amplifier itself starts distorting bass response at roughly 2/3 volume....At this point the Amp is unfortunately the weakest link which becomes even more apparent after eliminating all the other vibrations which allowed for the raising of volume even further...
That said, I'd like to clarify that even with the rear cover installed (without exhaust ports added) the OE woofer enclosures are still a ported setup...As I've mentioned a few times, placing a panel directly over these elongated ports (shown below) was a poor design decision by Toyota and the primary root cause of all the distortions and vibrations...
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Aside from this I did notice a few issues with the setup you chose to modify from what I had outlined and have added a few suggestions as to how to correct them which I hope you find helpful...
1) With the removal of the center bracket (shown below) that you decided to remove in your setup you also eliminated a key mount point of the center top cover which holds it down securely against the 8 subwoofer enclosure clips...
Without this mounting point secured the top cover will vibrate particularly around the 8 mounting clips (#2) under the top cover that secure the woofer enclosures tightly against the top cover as shown in the shop drawing below....
2) You really didn't need to replace the OE grill covers to stop them from vibrating...The issue here again is not the mounting clips around the 12 spoked grill covers but moreso with the upper spoked cover vibrating against the lower grill plate...securing them together with drops of RTV (red dots shown below) eliminated any vibrations there...
3) Make sure that the speaker wadding you added to the enclosure interior sits flat against the walls and not wadded up into the space or you will create more distortions...If this is a problem to do then simply remove the wadding all together...
4) Have you disabled Active Sound Design (ASD) which injects a engine noise overlay signal onto the audio signal channels and creates quite a bit of distortion and muddies bass response....
I remounted the original speaker grills but placed felt between the plastic rings and yes I now have zero vibration there. The design looks cheap.
Your point about the wadding is interesting I don't feel like pulling everything apart again to get this wadding to lie flat against the walls as its impossible to do this from the front ports.
So perhaps the thumping which I thought was excursion was actually the top section moving due to not having that central support clip?
Now that everything is back together in its original form but with foam, felt and sound deadening everywhere the whole area is solid enough and vibration free with the original slim panel without ventilation and its works perfectly.
In regards to the ASD I have not disabled this yet? does it really make a big difference? I have the Aussie version of the Supra and the exhaust is almost as quiet as a Toyota Camry. I can barely hear the ASD? I am about to fit a AWE exhaust system however I am not sure the ASD is even effective or barely audible?
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