Battery-to-Hatch Installation of 4 Gauge Wire: GTI

4 Gauge Cable Kit After 6 months of listening to the crappy stock stereo in my GTI, I finally broke down, bought some new gear and have begun the fun process of upgrading. I’ve got a new head unit on the way, but before getting to that I wanted to post about how I installed the 4 gauge power wire from the battery to the hatch location for powering up my amps. This can be a pain to do in some cases and with some cars, but in the GTI is actually really easy. I tried to take as many pictures as possible to show how I did it. This is by no means the only way, or even the best way to do it, but this is how I did it, and it only took a couple of hours to complete.

I bought a Street Wires 4 gauge amp install kit from Parts Express (who else?) which comes with almost everything you need to hook up as much as 800 watts worth of amplifiers. Not that I need that much, or even have that much power, yet, but I do want the option to get some new amps in the future, and in reality it’s just running the wire that’s the hard part, it doesn’t make much difference how thick it is, so might as well go as heavy as reasonable. Once you start getting into 2 and 1 gauge wires it’s probably more difficult, but I’ve never installed anything heavier than 4 gauge, and for most people, this is sufficient.

There is an unused hole in the firewall of the GTI just above the gas pedal from the inside, and above the master brake cylinder from under the hood. It’s plugged with a rubber grommet which can easily be removed by poking a screwdriver up through it. I’m not sure how big the hole is, I should have measured the grommet while I had it out, but it’s not much bigger than the diameter of the 4 gauge cable. I drilled a hole in the grommet and ran the cable back through it and down the hole and into the car and then seated the grommet nice and snug back in the hole. I left about 2 feet at the battery to hook up the fuse and for routing.

Once inside I ran the cable as high up and over the gas, brake and clutch pedals so as to not interfere. There’s plenty of room for routing the cable down the left front kick panel area and then down to the floor/door runner panel (is that what those are called? I have no idea). Getting these panels off requires pulling off the hood popper and then popping off the panel. It’s held in by one panel fastener in the middle, and one on the runner panel. It’s also held in around the door stripping. The base panels also pop off, with a screwdriver underneath at about every 8″ it comes right up, but not completely off. I ran the cable between the frame and the thick carpet padding underneath the runners instead of trying to run it below where the rest of the electrical cables are. It seemed like more of a pain for little value added. With the runners snapped back in place, that huge cable is completely out of view.

I couldn’t figure out how to remove the rear side panel, so I just managed to fish the cable up though it enough to get it behind the seat and into the hatch area. I did have to remove the rear seat cushion, which just pops out by squeezing the retaining locks and pulling it out. I ended up running the cable up the high-side of the back seat and coming out up top right into the emergency/first aid kit/CD changer compartment. Although my amp won’t fit in there, I just brought it to that location for the time being. And that’s about it. Back up under the hood I finished off the installation with a 100A fuse holder and bolted the cable right to the positive battery clamp using the bolt that tightens it to the battery. The cable came installed with a large ring terminal which fit right over the bolt for the battery clamp and makes a nice connection to the hot side of the battery. I sanded down the portion of the clamp that the ring terminal makes contact with as well as the washer on the other side of the ring terminal, just to ensure good electrical contact. The cable then follows the starter cable out the side of the battery cover, to the fuse which is mounted on the side of the battery cover, and then over it goes through the firewall, and the rest I already covered.

So that’s it in a nutshell how to install a 4 gauge power cable from the battery to the hatch of a GTI. Next week I’ll be hooking up the amp, the sub, the new head unit, and the patch cables from the HU to the amp. Until the, here’s some pics of the install.

4 Gauge Cable and 100A Fuse Holder Connected to Battery
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Location of Hole in the Firewall for Running the Cable
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Cable Through the Firewall Just Above the Master Brake Cylinder
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Cable in Car Through the Firewall Just Above the Gas Pedal
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Cable Tucked Away Behind Left Panel
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Cable Running Under Floor/Door Runner Panel Things
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Final Desitation of Cable in Hatch Area
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TC Sounds dB-500 in Sealed Box
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In the Market for a Laptop

dell1505lap.jpg So I’ve been thinking about getting a laptop for the past few months and am getting closer to making a decision on something here soon. I initially wanted to buy one before Vista was released, I would much rather have XP then Vista at this point. Mainly because I’ve been using Vista on my home PC periodically, and given the exact same set of hardware, XP runs much smoother than Vista does, and laptops typically are already slower, that last thing I need is Vista slowing it down even more. Since I missed the boat on getting XP (unless I buy something older from Newegg where many laptops still have XP) I’ve been trying to gauge which laptops are going to work well based on their Vista Performance Rating Score. I’ve to Best Buy and Circuit City and Costco in the last month and the first thing I look at is the Performance Rating and then I can compare them all against some known value. My home PC got a score of 4.4. I can’t remember what the individual CPU and graphics scores were, but my old Radeon 9800 Pro gets a 5.7 and it runs Vista’s overly-graphic UI without any problems. What bothers me about the majority of big-chain laptops (HP, Toshiba, Acer, etc.) is they all have integrated graphics (such as the GMA950) which get a performance index rating of 2.0 or less. I guess I should mention that I’m trying to keep this laptop in the $800 region. Nothing for gaming, but I don’t want integrated graphics, I mean, just in case I do pop in a game, I want it to at least work. So it’s hard to get a good performance rating for that kind of money. In fact, for $1000 most laptops fall in the overall rating of about 3.1, typically with the graphics card dragging down the score the most. Oddly enough, the CPU ratings don’t seem to change much whether it’s a Core 2 Duo T7200 or an AMD Sempron 3500+, which surprised me, considering the cost increase for the better CPU’s is a lot, not to mention the real-world performance improvement. When configuring laptops online, it’s just about the biggest cost jump you can do, next to adding more and faster RAM, or a bigger 7200rpm hard drive. So why doesn’t Vista show that in the ratings? I could be wrong, this is all from memory, I’ve looked at 50 different laptops or so, and trying to remember the specs on them all is harder when I don’t write anything down.

However I will say this, I’ve been watching the deals going on at Dell.com for a while, and from what I have seen, Dell offers the most hardware for laptops in the $800-$1200 range. This isn’t always the case, OfficeMax is selling super cheap Acer laptop with an older AMD MK-36 CPU, ATI 1150 graphics, 120GB HDD for only $599, which you can’t configure the same laptop at Dell for less than about $740. And a friend at work configured an HP laptop in the $1700 for quite a bit cheaper than he said Dell would have offered. But in the price range I’m looking, I can’t find anything better than what Dell has to offer. But it varies, and it drives me crazy. Every week, or possibly every day, or depending on how you enter the site (through an external link with a coupon code, or a code from the paper) two laptops configured the same way will vary by as much as $200-$300. So I’m worried that no matter what I buy, if I had just configured it differently, a coupon may have been able to be applied, and then it would have been cheaper. So each week, I watch, and I wait. And I’ve actually been tracking the different deals in a spreadsheet to see where the trends are. A month ago 80GB hard drives came standard, now they’re throwing in 120GB hard drives for free and free DVD burners, probably because all the other guys started doing it to, and Dell has to at least keep up with the competition. I haven’t seen the prices come down so much, as I’ve seen manufacturer’s just throw in extra stuff, or free upgrades, which in effect gets you a better laptop for the same money. The X1400 graphics cards are upgrades this week from the X1300 cards of last week. There’s part of me wants to buy something for cheap, like sub-$500 to surf the net in the living room and do whatever just to have a laptop. That was until I played around on a laptop that cheap, it had a Celeron M processor, and I about died while clicking around waiting and waiting for stuff to happen, not to mention it got a Vista rating of 1.0. Sheesh, they should stop shipping older laptops like that with Vista pre-installed and just put XP on it. The end user would benefit much more from a standard OS than something the hardware can’t handle. I would just install Ubuntu if I were to go that route. But I plan on installing it anyway on whatever I do get. Even Dell still offers their Business Laptops with either XP home or Professional.

Anyway, today’s paper came and the deal this week that looks really good, by far the best deal I’ve seen in this price range, can be found by going to www.dell.com/fsitaz and picking the Inspiron E1505. It’s $313 off the regular price and comes configured with: C2D T5200 1.6GHz, 15.4 1280×800, 1GB 533MHz, 120GB HDD, DVD/CD burner, 256MB ATI Mobility X1400, 9-cell li-on, all for $889. I’m about to jump and take the dive on this one, but I’ll probably wait it out, see if something better comes up next week. Which it might, in a case like this, it never hurts to wait. I’d really, really like to get 2GB of RAM, but it pushes the cost over the $1k mark I’m trying to stay under. (OfficeMax has a Toshiba right now for $999 with nearly identical specs but has 2GB of memory. But I can’t stand Toshiba.) So this is one of the best deals I’ve seen for a C2D (albeit the slowest of the C2D, it’s still better than any of the dual core AMD chips) with a dedicated X1400 graphics card. The 9-cell battery is a bonus too, a lot of laptops come with 6-cell or even 4-cell batteries, and almost invariably when you read about these laptops online, people complain about not being to get through one full-length movie without the battery dying. Well sure, a 4-cell battery isn’t going to last long no matter what you’re doing. If you want the long battery life, you have to pay for a decent battery. I don’t want a laptop that only runs for 2 hours either before needing a recharge. Not only that, but I want to get a decent laptop (not just an expensive one), and I really like the Dell’s. For whatever reason that may be, cost, styling, performance, or even the cool factor of owning a Dell, part of me just wants to get a Dell. And once you’re set on something, it’s hard to get derailed from that train of thought sometimes.

UPDATE: 4/16/07 – This deal has since expired, but until tomorrow you can configure an Inspiron 6400 with identical specs but upgraded to 2GB of RAM and XP or Vista for only $903. That’s an extra gig of memory for only $14. Now that’s a deal.

Update 5/14/07 – Inspiron 6400, CD T2350 1.86GHz, XP Home, 2GB, 80GB HDD, 256MB GeForce Go 7300, 6-cell battery all for $699. That’s a $379 savings off the regular price. This is a very good deal for only $700 considering the extra memory, dedicated card and Core Duo processor. Jumping up to a C2D processor and a 9-cell battery is about $110 more.

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The Perfect Thing and the iPod

thperfectthing.jpg I just finished reading a very interesting book called The Perfect Thing – How the iPod shuffles Commerce Culture and Coolness by Steven Levy. For anyone who owns an iPod (or two, or three) and is even remotely interested in how the iPod came to be, should definitely read this book. Levy goes into great detail discussing the many events, conversations, technological advances and pivotal moments in key people’s lives that happened at the turn of the century that paved the way to the creation of the iPod. Not just that but he goes on about how the iPod has created a culture, a society of music lovers, embracing their music in a way never before possible, and with ease. With the iPod it’s not just about listening to your favorite bands, but it’s about the emotion evoked by shuffling your iPod and allowing the iPod to mix and match songs randomly creating and making any mood which it seems fit for that moment.

Interestingly enough, the order of the chapters in the book are also based on this shuffle theory, and are randomly placed in the book when its bound. So no two books will start out with or end with the same chapter. Hey, that’s different. Even still, the book I had seemed to follow a perfect pattern of telling the tail that is the history and revolution of the iPod. The whole book was utterly fascinating, I loved hearing the story of how Apple approached the music companies with the idea to sell music, via the iTunes Music Store, and how at the time file sharing was so common-place, people could get music for free, why on earth would they pay for it? The music companies were suing everyone who even thought about using their content in a way that they believed violated their rights as content owners. And now Apple had a plan to legally sell their music, but it took some heavy convincing still that this was a good idea for the music companies. Now after a billion downloads and counting, now the music industry is upset that Apple literally owns the download market (since when was downloading songs from Wal*Mart cool anyway?). Can those guys ever be happy?

Anyway, Levy does a great job with this book, and now every time I pick up my iPod and go for a drive, I think about how this little wonder-of-a-piece of hardware and software was developed and created and how it has changed the way I listen to music. I still prefer to listen to a CD at home or buy a CD at a real store over iTunes, but it doesn’t stop me from enjoying my music on my iPod in the car, on the computer, or at work and being able to shuffle all songs for the ultimate mix that plays only the good songs, and won’t repeat a tune for months. Do I have gripes about the iPod? Sure I do, but for me it’s the best portable music player available and even though I could care less about being cool (there’s an entire chapter in this book devoted to why the iPod is the definition of cool), it’s more about functionality, ease of use as well as the seamless integration with iTunes and its ability to organize the plethora of songs I have stored on my hard drive.

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TC Sounds 12″ dB-500 Has Arrived

My 12″ dB-500 subwoofer arrived today, and man this thing is mighty! The aluminum cone looks very nice and the thick rubber surround is going to just bounce to the beat. I’m actually undecided at this point whether or not the sub is going to go into my GTI or whether it’s going to be for the home theater. It’s a tough choice since I think the sub is ideally suited for either application; small sealed box, or moderately large parted box. Either way I’m sure I’ll be happy with it. The stereo in my VW is stock now, but I have plans to get one of the new Alpine decks, like the CDA-9883 with the fast iPod interface. I’ve got a 50×4 amp sitting in my bedroom, haven’t had the need (or the will) to break down the interior of my car to get a 4 gauge wire from the battery to the hatch, not to mention the 3 pairs of RCA cables. It just seems like a lot of work, and I just barely got the car so it’s still new to me, and having everything stock is good, it’s clean, and it works, although the stock stereo is absolute crap. I’m hoping that with just a new deck it will sound a little better with the stock component speakers, because it’s the easiest thing to change out. I’m thinking about getting a set of PE Reference 4 ohm 6″ speakers to replace the stock ones, since they are inexpensive but should sound way better than the cheap paper cones that are in there now. I’ve got the 8 ohm Reference Series 6″ and they sound really good, what little I’ve listened to them.

Anyway, whether the sub ends up in my car or in the house, you’ll be sure to find all the details and lots of pics right here. Starting out with a few pics of this sweet sub. Aside from the weak stamped steal frame, there is nothing but superb workmanship throughout the design and assembly of this driver. It’s going to bump and it’s going to move some serious air. Can’t wait…

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CD Wallet Holds 416 CD’s but Zero Playlists

The CD wallet versus the iPod: they both store music, but in two entirely different ways. I bought a CD case on eBay last week that holds 416 CD’s and went through all my CD’s tonight, pulled them out of their cases and put each one into its own sleeve inside the the new case; I filled 414 spots, it took me 2 hours. After I was done I had a pile of empty CD cases that spread halfway across my living room floor. The CD case now weighs 15 pounds and is 7″ thick. It’s an absolute beast and contains every CD I’ve ever purchased. By contrast my iPod weighs 4.8 ounces, is only .43″ thick and contains even more music than can be stored in that massive CD case. My iPod cost $299, that CD case cost me $25 bucks. It’s all relative I suppose. The CD’s sound far better on my 2-channel stereo than my iPod does, which goes without saying. But lugging around 414 CD’s in my car, on an airplane, or into work just sort of doesn’t make much sense, does it? Even though I love my iPod, I’d rather listen to an actual CD on the pair of speakers I spent months designing and building than listen to some compressed, lossy version of what used to be a decent recording of a song. I only wish over the years I had kept better care of my CD’s, since so many of them are scratched beyond repair and skip endlessly. I used to be so particular about keeping such good care of them, when I was younger, but as I’ve gotten older I’ve just grown lax about caring for them. Anyway, now that I’ve bought the case, hopefully I can keep them from getting scratched any worse and I can enjoy the great sound that only CD’s can offer. Only it takes me 10 minutes to find the CD I want, instead of just a few seconds and a couple of clicks. Ah, but it’s worth it for that great CD-quality sound.

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10″ Sub In-Room Response Hits 26Hz

I couple months ago I built a small powered 10″ sub for my Dad’s family-room theater. It was designed to fit in the small space at the bottom of one of his bookcases, one of the reasons for going with a sealed design, to keep the box nice and small. Even though the model of this enclosure predicts an f3 of only 39Hz, I expected the in-room response to be somewhat better, since after all the model doesn’t take that into account. It shouldn’t after all, since the response of the box is what you’re designing to. What it does in the room is just a bonus. Ever tried to get a lot of deep bass outside in the backyard? It’s a little tougher. Anyway, today I found my Radio Shake SPL meter (that thing had been lost for the last year) so I thought I’d do some quick measurements and see what it looks like on paper.

We’ve watched a bunch of movies with this little sub and I’ve been extremely impressed. There is no active bass boost, so the input response is as flat as it can be (without worrying about non-linearities in the amp or sound card). The beginning of The Polar Express when the train is pulling up to the first little boy’s house just rattles and rumbles the whole house. I couldn’t believe a small 10″ 22L sealed box could have so much deep bass, and the sub isn’t even corner-loaded either, there is only the one wall behind it.

So I downloaded TrueRTA, which is available from www.trueadio.com onto my HTPC, then I set up my SPL meter on a tripod across the room on the couch at about the listening position, and ran the sine wave tone generator in 2Hz increments from 10Hz up to 80Hz and recorded and plotted the results. I kept the volume kinda low, one can only tolerate pure sine wave tones blaring away in the house for so long. I couldn’t believe that the in-room response of this sub actually has some decent bass down as low as 26Hz before it finally starts to rolls off. I compared the modeled performance to the measured performance and was happy to see that for the most part it looks like it should, however the low-pass crossover on the amp appears to be kicking in a little early, I may need to dial the knob up a little bit to pick up some more bass above 50Hz. There is most likely a standing wave at or around 15-20Hz which might explain the dip below the projected response in that region. I’m getting a bit of constructive interference around 28Hz and 42Hz where there’s some bumps in the response there. Overall however the measured in-room response is within +/- 4dB of the modeled anechoic response, so all in all, that’s not bad.

I also measured the near-field response by locating the meter about 1″ away from the dust cap on the driver and then repeated the measurements. The graph is shown below. This type of measurement mitigates the effects of the room and measures more accurately the response of the box/driver. When compared to the modeled performance, it’s just about right on target. If you took out the 80Hz low-pass filter, the rolloff appears to begin dropping right at about 40Hz and then follows the modeled response all the way down to 10Hz. I should take out the low-pass filter, I bet the two graphs would line right up. That just proves that you can achieve predicted results through careful desing, modeling and building. T/S parameters really work, once again. Of course the response of a sealed box is easy to predict, it’s the TL boxes and EBS 4th order boxes that get more difficult.

In the end it really comes down to how does the sub sound when kicking back and watching movies, and this little sub really can perform. It’s not going to be breaking any SPL competitions, and I’m not going to do a max SPL in-room measurement either (I’ve cooked too many subs by just grilling them with 20Hz sine waves and watching the cones go in and out, ooh, neat, pop! dang!). I’m anxious to see what kind of in-room response I can get from my dB-500 12″ sub in a box that actually is suppose to be flat all the way down to 20Hz. That should be downright awesome! So I can’t wait…

Click here for a complete review of this sub

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