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snafu

SMD PARTNER
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snafu last won the day on November 27 2019

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About snafu

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  1. Like FREE stuff? Well then you definitely want to get in on our FREE T-Shirt or Hoodie Program! Each are SUPER NICE Gildan products with low shrinkage factor ( ! ), beautifully done artwork, and super comfy! Here's the skinny - https://ceautoelectricsupply.com/free-t-shirt-offer/
  2. Interestingly enough, this topic seems to be quite mis-understood. Folks assume that more voltage is better; but, that is not always the case. For example, let's say that you invest a bunch of money in batteries and then you ramp up voltage to 15V or so. While your amps (with unregulated power supplies) may indeed make more output power (say 10%), the life of your batteries will be dramatically shortened from continually being overcharged. While 10% more power may show up on the meter, you certainly can't hear the difference. So, the pro of the extra power doesn't outweigh the con of shortening the life of expensive batteries. This proves yet again that there is no such thing as a free lunch.
  3. SS is our oldest SMD Partner - dating all the way back to June of 2009 (wow!) . In that time, they've run some killer promotions and sales for SMD Members. This is the deepest one I can recall!
  4. Still got it but it's likely going up for sale soon . . . Since the last post, I've put maybe 8k on the clock.
  5. What you didn't tell us is what kind of vehicle this is. Many, and I mean many, late model vehicles have all kinds of challenges facing you in the digital domain that must be undone or normalized before installing new gear - equalization contours designed to make $3 speakers sound like $30 ones, fully active systems with each component having a narrow bandwidth of operation and / or delay, multiple position contours overlaid on top one another, etc. In addition, you could have some impedance mis-matching with your interface which could cause frequency response irregularities, etc. So, share a bit more.
  6. And now . . . it's in full color! Check out this example I did for a positive battery cable assy for a builder that prefers to use all black cable. The red battery boot keeps things sane when it comes time to break out the booster cables. The smaller 8 AWG auxiliary cable goes to the under hood power center. https://ceautoelectricsupply.com/custom-cable-builder/ If you've not tried it by now, then check it out. Design a cable, take a screen shot of it, post it up here, and tell us what it's for. You can literally do this in minutes!
  7. Ready. Willing. Able. We build the very best cables in the industry, bar none. I'll stake my reputation on it.
  8. Check this out! Our CCB allows you to custom design cables to your exact specifications. AND, you can see the cable you've created before your very eyes as you're creating it! You simply have to try it - it's super simple on your PC or phone! https://ceautoelectricsupply.com/custom-cable-builder/ Try it out and let me know what you think!
  9. I like it. While SD's post is lengthy, it's also accurate. When it comes to charging system design, here are the factors you must consider: 1 - Intended use of the amplifiers - music / SPL / both 2 - Duty Cycle of the media (a function of #1) - heavily compressed pop music (or rap / bass discs) has a duty cycle of 50%, sine waves have a duty cycle of 100% 3 - Voltage available 4 - Current required 5 - Voltage Drop you're willing to live with (SD uses 5%, I tend to like 3%) 6 - Law of Diminishing Returns Once you have these answers, then it's a simple process of using Ohm's Law to arrive at the answer to a question like this. #6 is an ass kicker for sure. For example, you add three additional runs of cable and pick up .2dB on the meter. That's not insignificant if you compete - could make the difference between winning and losing - but the human ear can't detect the delta. Then, you add three more runs and pick up another .15dB on the meter. That's a total of 6 runs to pick up a third of a dB. Again, maybe that's what it takes to win. But, where do you stop? Personally, I don't think 90% of the members here at SMD are die-hard SPL competitors. Keep in mind when we're talking about thousands of Amperes of current and minimizing voltage drop, every single thing matters. Are you using the best materials available to you? Are your terminations done in such a way that voltage drop has been minimized. Etc. This process is referred to as minimizing your losses and it's what all of the world's best designers and engineers utilize. SD - well done. PM me your stuff so I can mail you the TORK2.
  10. Really, it's all about current over distance and how that affects voltage drop. Maybe I should build a calculator for such on our web site . . . hmmm . . .
  11. SD - I'd like this answer a LOT more if you edited it to incorporate the duty cycle of music. [Yes . . . I see what you did with the 15kw calculations - but let's get the enthusiast there more directly.] Let's all stay tuned and give SD the chance to edit accordingly.
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