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Discussion Starter #61 (Edited)
Wow! After two days of working nonstop over the weekend I finally have bass!

And it sounds good (if you ignore the panel rattles). The pair of 10’s with the periscope port are having no problem hitting the lows (though I did start with basically the maximum port length that I can fit at about 2.5 inches from the ceiling). A 30 hz test tone was pretty ridiculous and mainstream rap/EDM baselines were impressive to say the least.

No tuning or anything has taken place, I just hooked up power to the amplifier and connected the speakers wires and it worked; to be honest I don’t even know what the settings look like in the TwK.

I spent some time preparing for the enclosures arrival by redoing my wire identification and adding through holes in the amp rack and guides/bumpers for the speaker wires to improve wire management. The white wire guides also prevent the enclosure from crushing the speaker wire on the aluminum amp rack corner.
 

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Freakin awesome, man! I've never seen anything like it, but I can dig it! Really clean work, too.
 

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Your works looks awesome! Super cool set-up/build. Great job. Are you going to paint your port or anything? Probably tune it in & trunk liner it or something?
 

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Nice car, nice build with lots of attention to details, nice bikes, nice dog,.......:D
 

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Discussion Starter #65
Freakin awesome, man! I've never seen anything like it, but I can dig it! Really clean work, too.
Thanks! It has been quite the journey and a lot of fun.

Your works looks awesome! Super cool set-up/build. Great job. Are you going to paint your port or anything? Probably tune it in & trunk liner it or something?
Eventually I will finalize the port length and bond the segments together followed by paint, perhaps the same textured coating as the nominal enclosure. For now I’m going to go with tape so that I can play with the tuning.

Nice car, nice build with lots of attention to details, nice bikes, nice dog,.......<img src="http://www.diymobileaudio.com/forum/images/smilies/biggrin.gif" border="0" alt="" title="Big Grin" class="inlineimg" />
Now it’s time to get a nice tune ?.
 

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Discussion Starter #66
And finally some measurements of the periscope port enclosure! All measurements are with the 26.5" port length (including flare), and no polyfil.

I was able to get rid of a decent peak at 49 Hz and am happy with the low end extension; though based on the solid performance down to 25 Hz im wondering if I could afford to reduce the port length a bit?

Is it worth trying to improve the response in the 45-52 Hz region when viewed in 1/12 octave?

Apologies in advance for what I'm sure are poor REW graph settings/parameters for viewing/analysis, let me know what to change for the next set of tuning tests!
 

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Discussion Starter #67
Since I have attempted to create a highly configurable enclosure I figured I would post the theoretical performance envelope of the system in the sealed and vented configurations.

I have yet to try the enclosure sealed, and will be attempting to fabricate a plug this weekend, but I am excited to see if I will be able to shorten the vent length (while maintaining the same basic tuning frequency) with the addition of polyfil.

I will be attempting to now go about tuning my front stage in earnest and will post response graphs (and i'm sure questions for those more experience than I) as I make progress.
 

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Discussion Starter #68
Some progress was made over Thanksgiving on the amp cover and I’m happy to say I have a functioning cargo area again!
 

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Wow, this is essentially quite similar to the refresh I’m doing this year on my GC. C7’s with 2 HD 600/4’s and 10w6’s (I have HD750’s but may just use a HD1200/1 for simplicity). As others have said, amazing work! Personally I would have liked to see your 4th order bandpass box results but I’m definitely looking forward to your thoughts on the c7’s once tuning is set.
 

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Discussion Starter #71
Your right about that being a pretty similar setup! The C7’s are sounding beautiful to my untrained ears, but then again I don’t have much to compare them in the car audio world. With Tracerite TA and REW/RTA tuning I’m getting a strong center image/soundstage and am enjoying all types of music through the system.

Small system update. I picked up a Fiio M11 Pro as my primary source via the digital/coax input on the TwK. Initially I was going to get all fancy and make a custom holder/charging station in the limited area that I have but I ended up just using a compact magnetic cell phone mount. The cable is routed under the center console through a factory hole with excess cable inside of I want to grab the DAP for a closer look.

The Fiio has been serving me well (both in the car and in driving my Sony over ear headphones) and is sounding great while making for pretty easy access to my music collection and streaming services. The FiX corrected factory output has its own preset/setting in the TwK that I can toggle to on the fly for phone calls or audio from cell phones etc.

In other news I have finalized the port length at 26.5” and bonded the segments together. After bonding I wrapped the outer wall with a layer of Resonix CLD sheet followed by several coats of Second Skin spectrum. In terms of the enclosure I still need to order some mesh material to cover the floor vents but I don’t hate it without them so I'm not in a huge rush. I also plan on installing some LED strip lighting under the overhang of the enclosure to provide some (hopefully) cool indirect lighting when desired.
 

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Discussion Starter #72
Since the enclosure must be removed to access the amplifier gains I justified replacing the terminal with the new magnetic version the SMD offers. If anyone is interested In the standard copper version that I removed( I have two, on NIB) let me know!.

While the box was out I wired in a LED strip with smart phone control to provide lighting effects in the back when desired. Not too shabby!
 

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Great read, Great install...I love the periscope port, looks like your subs are ready to roll coal.
 

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Discussion Starter #74
Great read, Great install...I love the periscope port, looks like your subs are ready to roll coal.
Thanks! It’s been a journey for sure! Still work to do on many fronts but it’s getting there!

The port has grown on me for sure; rolling coal from this chimney would be an expensive one time affair though ;).
 

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Thanks! It’s been a journey for sure! Still work to do on many fronts but it’s getting there!

The port has grown on me for sure; rolling coal from this chimney would be an expensive one time affair though ;).
This is the best build I have seen so far. Your patience and attention to detail are next to none. Even your explanations and photos are very detailed. I have 3 way C7's ordered and your build gives me the inspiration to take my time to do things right. Thanks for sharing this awesome build.
 

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Discussion Starter #76
This is the best build I have seen so far. Your patience and attention to detail are next to none. Even your explanations and photos are very detailed. I have 3 way C7's ordered and your build gives me the inspiration to take my time to do things right. Thanks for sharing this awesome build.
It's great to hear that some of my work and progress on this install might be helpful to someone who is about to take on a similar endeavor; to be honest, I didn't know the mountain of work that I was getting into when I started but the process has been therapeutic and a great learning experience.
 

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Discussion Starter #77
And finally some REW plots of the install and C7 front stage! I have been using Jazzi's tuning guide spreadsheet and have tuned to the "Jazzi" house curve over the weekend in a fairly course first pass tune. I have had other tunes in the car before in which I did not utilize a house curve and was able to get to a place that was quite enjoyable but I am not one to leave things alone.

I'm sure that the plots aren't "best practice" in terms of the settings used (1/6 octave smoothing used while in RTA, it sounds like most smooth after the fact?) and perhaps the scales aren't the best but here is a snapshot of where I am at with the system. Improved tune and measurements to follow.

Of note, in order to get the desired acoustic responses of the drivers I have settled on crossover settings/slopes that are quite different for the MR. Driver side I landed on 425-24LR HP and 6000-24LR LP while the passenger side ended up at 650-12LR HP and 5250-24LR LP. Perhaps this is the result of my A-Pillars being different as I have sealed up one side and treated it with Resonix while the other side (passenger) is still playing IB as I have not been able to update the passenger pillar yet. I plan on taking some detailed measurements of the sealed vs. IB configurations and will post here when ready.
 

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