kirill007
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Posts posted by kirill007
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Never hurts to try and win something.
21,776
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It's more then enough, unlike the general consensus on forums you don't need to go above the manufacturers rating.
You won't hear the difference between 1000 and 1500w
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I just checked the link. It calculated I need an 8 inch port at 49 inches length. That's 1.5 ft^3 of my 2.5 available volume!!! How do I get around this?
You have found out why 8inch subwoofers are useless in cars, even though they exist, they shouldn't.
Sealed enclosure (1 12inch) or 10inch ported are probably your only good options with the space you have available.
Anything else will not be efficient.
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Velcro(high quality) is your friend.
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at first the price hits you like damn thats expensive. but then you see that they are assembled in the US and not only that, its done by hand not a robot. that makes the msrp realistic.. if i was to be building an SQ car these amps would be at the top of the list
Don't forget the quality parts/material costs...
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This is pretty awesome seeing the amp go from thought to production. I used to work in the engineering and testing department for a company that produced telephony equipment so I have done my fair share of testing (and also repairing what the engineers break lol.) I also worked in vending/amusement repair so we got to play with a ton of high current MOSFETS/Transistors etc.
Have you thought about using: http://www.bergquistcompany.com/thermal_materials/hi_flow/hi-flow-300P.htm, It is phase change like you were using before but is made for high current applications. I bet the ceramic is a nice material but I have my doubts that on a microscopic level that it is maintaining complete contact with a porous material such as Al..
You need to get Magic Juan some magic tools!
Looks like he will need a solder fume extractor (solder fumes are not good to keep breathing in and need to be evacuated for employee health)
Get that man a hot air rework station and solder paste for SMD work! You will find his solder joints improve exponentially
He needs a tip cleaner/tip tinner too for the soldering iron and a new tip!
A raise lol.
Awesome work.
How much do one of your amps run for either home or car audio?
http://damoreengineering.com/collections/audio-amplifiers/products/dual-mono-power-amplifier
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Many, many late nights later I am ready to send the files off to the PCB house and order all the components to build one. Now that this PCB is done, I get to do it all over again for the right hand PCB. No there is no magic button I can press to tell my software to do the opposite of the whole board for the other side. If you try that it will reverse all of the "footprints" for the components and when you build it every part will be in backwards and some of them can't go on the board any other way. Ask me how I know this.... $600 down the drain. Eventually I had to make the right hand board from scratch like the left hand one.
I know that feeling..
These amps look very very promising.
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7.5k X 2 = 15k @ 2ohms
Damn, could you explain to me how you calculated that?
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Damping factor above 700 at 4 ohm load at 20Hz.
I wonder if people actually look at that number when looking for a SQ amp.
(And if they know how the speaker wires change that number.)Price seems fair in my opinion (if the orange peel is fixed).
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Specifications look great and the parts too, layout is great.
Will the paint finish be better on production units?
Maybe i should start saving...
What's wrong with the paint job?
Orange peel finish.
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Specifications look great and the parts too, layout is great.
Will the paint finish be better on production units?
Maybe i should start saving...
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Hibiki suntory 12yo
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Why would it be wrong?
That's why you shouldn't go after the numbers on amp.
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Now let's wait and see how long it takes untill someone says that you ripped off the color from that nova before you painted it your custom color.
Great lookings cars though, that color probably looks even better in real life then in the pictures.
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i looked deep into my youtube comments and found 2 pages of them from him to me...i didn't see anything negative from him towards me. All good. I didn't see where i posted anything negative to him either.
that being said, this is just the nuttier side of things i get to deal with. People on social media are not only trolls, assholes and instigators, but they also are straight up crazy in the head. Making shit up for no reason to get that 5 minutes of attention. Gotta love the internet..again, i don't even know this guy at all and i am now dealing with his crap. SMH
Just don't put in the time for those fools..
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I mean I can't remove the secondskin on my old neon if my life depended on it.. is there a trick or something? rofl
Replace the
doorcar.fixed
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i have had nothing but issues with crockfords products. no its not installer error either. will never support their products ever again. bestbuy dropped them for warranty issues as well. shit hole company. the threaten the local dealers to purchase more or they will pull products from them. good luck with selling such high priced crap to cheap shops.
Well if you would've bought Rockford Fosgate products instead of these chinese crockford knockoffs there wouldn't be a problem.
To the OP, 3 days probably isn't enough to ship it to RF, never mind the fact that they need time to test it.
After about 2-3 weeks you might start to worry a bit. Average electronic RMA takes 3-4 weeks..
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Less full of shit then understand what resting voltage means, and combine that with a cheap/uncalibrated DMM and there you go.
But it should be around 12.8V, 12.6V is on the low side, eventhough we are talking about less then 2% difference.
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Hey hey, next you need to get some people to engineer a few 4k 200hz monitors for you....
(and off course new graphic cards to properly make use of them)That's a great setup, I guess it would take a bit of time for me to get used to something like that if I ever moved from my single 20 inch full hd monitor
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I'm poking a little.
But if I understand the video, that is the distortion measured at the speaker outputs.
That's 1% THD at the speaker outputs, that all the distortion combined from source to speaker outputs on the amps.
So if the line drivers aren't set properly you will hear it at about 1% distortion, if the EQ isn't set properly you will hear it at 1% distortion, and so on.
I don't want to make a DD-1 vs whatever other method of gain setting thread out of this.
Thanks Tony for this video.
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That's great, now we don't need to buy a DD-1 anymore, we can go back to the ear-o-meter.
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This write up was done for the Maxwell's, but everything still applies as I assume Scottie's are just as awesome.
There's been a lot of talk about supercaps on here lately. There is a ton of confusion and a lot of questions about them. I thought I'd share what I know and let other discuss them here.
First, and let me just get this out of the way... caps store electricity on plates. Batteries produce electricity through a chemical reaction.
Recap...
(6) 2.5v/2,600F = 15v/433F
(7) 2.5v/2,600F = 17.5v/371F
(6) 2.7v/3,000F = 16.2v/500F
(7) 2.7v/3,000F = 18.9v/428F
So, let's say we have a bank of (6) black ones. That's 15v/433F.
433/2 = 216.5
15x15 = 225
216.5x225 = 48,712.5 joules.
That's 48,000 watts for 1 second. Wow. or 24,000w for 2 seconds. And so on. Now, that doesn't take into account our operating voltage of >10v or so. If you take that into account, it's more like 6,000-8,000 joules. But that's still a lot. And that's just a single bank.
Caps store a (electrical) charge.
Batteries don't produce electricity (except the first time it's made), they only convert the electrical energy into a chemical reaction that is reversible when a load is attached to the terminals.
This is why caps are so much faster, they don't have to undergo a (slow) chemical reaction.
Recap...
For our voltages:
Energy = 0.5 x C x (Vmax^2 - Vmax x Vout)
0.5*433*(15²-15*10)=16237.5Ws which is still pretty good.
And heat is quite the enemy of capacitors, so mounting them in the engine bay won't do them good.
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Q: What makes them any different than any other ultracap out there?
A: Nothing. They work equally as well as any other ultracap we’ve tested… they just look way cooler.
I like this company for it's honesty.(and good products)
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It's not that difficult to turn it over.
900amps= 900*15V=+- 13.5kW, about 15kW if you count in efficiency.
15kW=20.1Hp, it's only about 11.2HP at idle.
Just rev up the engine a little bit and youll be fine.
A BMW 320i already has 30+ HP at 1.5k rpm.
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Custom sundown sub only playing low frequencies. why?
in Sundown Audio - GREAT Amps/Subs! GREAT Customer Service!
Posted
Show us a picture of the box.
More port area will not limit higher frequencies.
Too little port area will restrict the lower frequencies at high output.( so it give a false sense of "wider frequency response")
A "Frankenwoofer" either needs different boxes to test or you need T/S parameters to model a proper box.
It's very possible you have a exagerated low end which makes it seem as if there isn't much above 55hz.
Remove all the crossovers and test at moderate volume with a frequency sweep from 15-100hz.