Jump to content
View in the app

A better way to browse. Learn more.

SSA® Car Audio Forum

A full-screen app on your home screen with push notifications, badges and more.

To install this app on iOS and iPadOS
  1. Tap the Share icon in Safari
  2. Scroll the menu and tap Add to Home Screen.
  3. Tap Add in the top-right corner.
To install this app on Android
  1. Tap the 3-dot menu (⋮) in the top-right corner of the browser.
  2. Tap Add to Home screen or Install app.
  3. Confirm by tapping Install.

Julian

Super Moderators
  • Joined

  • Last visited

Everything posted by Julian

  1. Julian replied to swift's topic in Build Logs
  2. if someone did this for me... i'd shit bricks
  3. So offer him $3k. Considering the description I think he might bite. I called and left a message. Good luck! Not a Diesel I Lol'd so hard. Did you actually look at the picture? :s
  4. NSFW TOP!
  5. More wattage.. (volts)(amps)=wattage So lets say you would have a theoretical draw of 200 amps... 200 amps x 24v = 4800w Now times that by lets say... .75 accounting for efficiency at one ohm for a normal class d amp. so that would give you 3600 watts from a smaller amplifier than a much larger one at 12v. but not realistic... as one company i know of that makes 20v amplifiers is Stetsom.
  6. Nice, very technical way of saying no. I didn't know they had that going on, sorry. They also OEM other companies, showing trade secrets = court and court = bad.
  7. Please read the noob posting guidelines.
  8. Fi has something called NDA's SO ITS NOT GOING TO HAPPEN! A non-disclosure agreement (NDA), also known as a confidentiality agreement, confidential disclosure agreement (CDA), proprietary information agreement (PIA), or secrecy agreement, is a legal contract between at least two parties that outlines confidential material, knowledge, or information that the parties wish to share with one another for certain purposes, but wish to restrict access to by third parties. It is a contract through which the parties agree not to disclose information covered by the agreement. An NDA creates a confidential relationship between the parties to protect any type of confidential and proprietary information or trade secrets. As such, an NDA protects non-public business information.
  9. That's why it said "dare" haah.. I almost puked.. awwful! I thought it was going to be rather tame.. but nope...
  10. This was my HU i was considering.. Instead i got the single din media reciever.
  11. Word!
  12. I literally loled Its true though. I've been there MO Isn't too bad
  13. HORRID! It's the retarded bastard-child from an oil-soaked night between a Z4 and a Panamera. agreed! Looks like a soccer moms midlife crisis...
  14. I was THINKING these, http://www.amazon.com/gp/product/B002UQ2CVW/ref=pd_lpo_k2_dp_sr_2?pf_rd_p=486539851&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B002VARLKE&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=1AXZ7QTA30VDP5E57BNN but it's up to you, since there wasn't really anything secure i could mount to on the back.
  15. I can hear a difference from 90kbs to 192.. but that's just because it's a huge jump.. but from 192-320 i don't hear much of a difference.
  16. I knew it was by Neil.. it was on a different site though!
  17. Power compression is a topic that is rarely discussed, but always important. When you hear someone call various theile/small parameters a “small signal parameter”, the implication is that with larger signals (more power), there will be a shift or change in these theile/small parameters. This is what we call power compression, and occurs in 3 potential ways. The first thing to consider is how theile/small parameters are derived. There are 5 basic parameters from which all other data is extracted. These parameters are Re, BL, Mms, Sd, and Cms. So looking at this from a mathematical standpoint, a change in any of these parameters will cause a change in all other parameters as well. Of those 5 parameters, there are three that can change once power (rather, more power) is applied; they are: Re, BL, and Cms. Now we will review the cause and effects for each one. Re is the measured DC resistance of the voice coil. When power is applied to the voice coil, the metal becomes hotter, and resistance increases. Heating copper by 200 degrees Celsius will double the resistance, which doubles the measured Re; this results in a 3dB loss in acoustical output. Being that this is also one of the 5 basic parameters, you will see a change in all other parameters as well. For example, a change in Re will cause a large change in your enclosure alignment because doubling Re will also double Qes, as demonstrated below: Qes = Re*Sqrt(Mms)/(BL^2*Sqrt(Cms)) This is power compression at it’s finest, and the most commonly mentioned one, known as Thermal Power Compression. The second type of power compression refers to motor force. As power is applied to the voice coil, causing it to progress out of the gap, the motor force (or BL) begins to decrease. This decrease in motor force causes a drop in output and, again, a shift in all other parameters. When the motor force drops by 30%, you've lost 3 dB in output. This is, in part, one of the reasons why more recent definitions (from DLC and Dumax as well as Klippel) of Xmax have defined it as 70% of rest BL. This type of compression is referred to as BL Power Compression. The third type is related to the compliance of the suspension. As power is applied, the voice coil begins to move out of the gap, causing the cone, spider, and surround to move as well. This movement changes the compliance of the suspension, and is known Cms Power Compression. Of the three, power compression is a more gradual process. A quick burst of power will heat the voice coil quickly but it will take a while to cool back down and remain fairly constant. Over a 30 second period, the coil will have cooled down and been reheated several times, so that while you thermal power compression occurs, it's not it does not occur nearly as fast as BL and Cms. In other words, thermal power compression is a much less dynamic issue. BL and Cms power compression are very frequent and occur on every stroke, as a stroke is simply the voice coil and attached assembly moving. For example, playing a 60hz sine wave will cause 60 full strokes in a one second period of time, and since BL and Cms compression occurs at both the positive and negative ends of the stroke, you would actually encounter BL and Cms power compression 120 times a second! Of course, as power is applied, excursion increases, and BL and Cms compression increases as well. This is why it’s so important to find a driver that has very flat BL and Cms curves (measured on Dumax or Klippel) because these curves represent the behaviour of BL and Cms over the stroke; if the curve is relatively flat and extends out fairly far on either side, BL and Cms compression will be of little effect until you reach the extremes. For most installs, BL and Cms compression will be of the greatest concern. For those who compete or have fairly high power stereos, thermal compression will become a growing concern as more and more power is applied. To summarize, Thermal, BL, and Cms Power Compression are all issues to consider, but it is important to understand how to work around these issues while knowing which drivers suffer more than others. A driver with adequate cooling and flat BL and Cms curves out to 20+ mm will likely experience very little parameter shift and, as such, is likely a better candidate for your high end stereo.
  18. Or space issues as you can use smaller 16v batteries as the current draw will be much lower... It's something that takes a lot of planning.. And some know how. By the time you factor in the increase in power as a result of bumping the voltage up to 16V, current draw would probably equal or exceed that of the same amplifier running at 13.8V-14.4V. Even excluding an increase in power, if we leave power constant the difference in current draw between 14.4V and 16V is going to be ~10%. And the increase in power would be 100% inaudible. Not worth the time or expense to try to do anything like this for a daily driver system. You're better off focusing on maintaining a proper "normal" voltage than trying to increase the voltage up to 16V+. For competition it can make sense. For daily driver systems, it's complete waste. Agreed very true, not really ideal for a daily scenario.. I was just attempting to rationalize a reason for a daily scenario Brad
  19. RIGIDITY comes from bracing! Without having to have the box 2-3x the thickness! The definition of rigid is Stiff, rather than flexible; Fixed, rather than moving; Rigorous and unbending.
  20. Build a ported box well, it will be able to play all kinds of music! Honestly you're better off porting. If you really Want to get fancy you could make a removable port plug to seal if you'd like. Anyways, it's all in the install and planning man! Building a box.. Is well building a box.. Not hard just gotta have the tools and patience!
  21. Or space issues as you can use smaller 16v batteries as the current draw will be much lower... It's something that takes a lot of planning.. And some know how.

Configure browser push notifications

Chrome (Android)
  1. Tap the lock icon next to the address bar.
  2. Tap Permissions → Notifications.
  3. Adjust your preference.
Chrome (Desktop)
  1. Click the padlock icon in the address bar.
  2. Select Site settings.
  3. Find Notifications and adjust your preference.