sundownz

The new product pages are not entirely up to date on the 3500D and 2000D... working on that... should say 7000 strapped. For a real DAILY system the increased strain of 1/2 ohm is much more than most internet "experts" will lead you to believe... people still do it and may or may not break their amps, but it is a MUCH higher strain than 1 ohm.

QUESTION FROM "atsaubrey": Since Sundowz brings up the issue, I would love to hear his take on low impedence loads period and how it effects things. Like, effciency, longevity, SQ, heat and electrical systems. I see it everyday on this forum, people asking can this or that amp run at .67 or .5 ohms although it is only rated at say 1ohm. Since the manufactuer stated the thread maybe people will listen. So Jake will you answer those questions? Jake at what impedence do you run your own personal gear at on a daily basis? --- MY ANSWER: If you look at a data sheet you can see that as a transistor gets hot it has a lower current rating... running an amp at a lower impedance increases the current passing through the transistors, heating them up, and progressively lowering their ability to handle the current until something fails. Dropping an amp to 1/2 ohm doubles the output current (up until the amp just can't put out more at least) and makes everything less efficient so the power supply in turn draws more current, often times inducing more voltage drop which calls for MORE current to maintain the same output level - again, turning into a cycle if it continues until something fails. Many amps are robust enough to handle this pretty well - but the more you push the amp and the more clipping that goes on you get closer to realizing the impedance chart I posted above for a square wave which can drop down VERY low. That sort of thing can destroy even a very robust amplifier design when you are already running at 1/2 or less of the rated impedance load. It all started with SPL competition... where you play ONE sine wave at a known impedance so you can get away with a really low nominal load. That is all well and good, but music is not a single sine wave - you do not know what the impedance curve can do and it CAN drop below the nominal load, unlike "common knowledge" on the forums may tell you.

I know it is said a 100 times a day... "with impedance rise you are going to be over 1 ohm anyway" when talking about a half ohm load or lower on a daily system. Sure... if you constantly played individual sine waves one at a time. But, is that what music is? --- http://www.audiograph.se/subpages/technical/whatmakesagoodamplifier.htm "The upper graph illustrates the conventional way of measuring the loudspeaker impedance. The lower graph illustrates the dynamical approach. We took a commercial ’off-the shelf’ loudspeaker and did a standard impedance plot for it. We swept the frequency from 20 Hz to 20 kHz, measured the input voltage and current, and calculated the impedance. However, instead of using a sine wave input signal, we used a square wave. The reason for this is that square waves consist of a large amount of sine waves, as does music. The square wave is of course not an equivalent of music, but for this test it was an easy way of showing that a complex signal (not just a simple sine wave signal) may make the load, from the amplifier point of view, very low. If you study the graph resulting from the test, you will probably agree that not only is it necessary to check the amplifier’s behavior for resistive, capacitive and inductive loads – the amplifier should also be checked for loads with lower impedance than the nominal impedance of the loudspeaker. This proves to be very important, since a loudspeaker with a nominal impedance of 4 ohms will sometimes have an actual impedance of 1 ohm or less. The PowerCube helps you perform testing of an amplifier, taking all these load attributes into consideration. " ----- Keep that in mind when you want to run your amplifier at a super low impedance "daily"

Not sure who told you they don't like over 3v... but the limit is 6v. There are issues with fancy RCA cable connectors, though, many times they don't make good contact. Cheaper cables don't have this problem. do u consider the knukonceptz krystal cables fancy? ... i just bought them and i am buying some sundown amps I have seen those work for people... anything with high tech looking ends on the cable has the potential to be an issue, but not always.

All of this talk about "with rise" for a daily system is BS... by the way. Half ohm nominal is half ohm nominal. Little more information about that : http://www.audiograph.se/subpages/technical/whatmakesagoodamplifier.htm "This proves to be very important, since a loudspeaker with a nominal impedance of 4 ohms will sometimes have an actual impedance of 1 ohm or less." It can be LESS than nominal on music.

The answer is you most likely won't tear up the amp but it is not impossible.

One SAZ-1500D @ 1 ohm works quite well.

Sweet.

Not sure who told you they don't like over 3v... but the limit is 6v. There are issues with fancy RCA cable connectors, though, many times they don't make good contact. Cheaper cables don't have this problem.

For ONE BTL you don't need any more than a 3500D.

I'd go with one 4500D. While the BTL may handle the 3500 each if you are careful, IMO, you don't need that much on them to work well.

You should get some Kurt

Nice shirt guys!

Special is still going !

KLM is fine for your 1200D.

They perform just like a 1500D with more power.

DO NOT DO IT, PERIOD. The Brazil amps are all very high voltage designs... no reason to run them under 1 ohm anyway. Try to re-wire higher... such as 1.33

There are a few 100 out there -- good luck finding them

I highly suggest 1/0

Mmmmm... I can't really get it wired right in the Jeep to the subs without completely re-doing all the wiring.

TTT

Indeed, this is our 600-watt line. They do look just like a little Monster, though They have the same cooling.

They are all remote gain knobs.

Very rarely it is necessary if the head unit RCA voltage is so low you cannot get decent output even with gain at maximum.

Suggest Box Specs : SA-15 : Sealed @ 2.5 cubes (Qtc = 0.888) - F3 of 42 Hz Ported @ 3.0 cubes tuned to 35 Hz - F3 of 30 Hz SA-10 : Sealed @ 0.75 cubes (Qtc = 0.649) - F3 of 50 Hz Ported @ 1.25 cubes tuned to 35 Hz - F3 of 29 Hz