Kreative Audio » music

AUDIO AMPLIFIERS FOR SALE

KA — Sat, 13 Mar 2010 05:40:55 +0000

Do Jensen make good Amps?

Here’s the deal…(I Live in Victoria Australia – only car audio stores I have access to are Autobarn, Supercheap Auto, Repco, Jaycar & Strathfield…My mate got me a $30 voucher for my Xmas present this year for Repco, I don’t have and Amp or sub in my car yet..their all i need left to get to have a full audio sound system, Repco currenlty have a sale on for the amp in the link below for $70…would It be worth adding an extra $40 and get it) To be quite honest, I’ve only ever heard a Jensen CD Player…
So I have NO idea how they rack up in the car audio industry.
Do they make good amps at all?
Such as this:
(Would I be able to run 1 sub, and 2 6 x 9’s off this 2 channel amp? or not???

thanks

http://www.ryda.com.au/Jensen-Power400-Marine-2-Channel-Amplifier-p/power400.htm

Jensen are not at the top of the list, but they are very affordable.

I bought a 400W Jensen amp back in 1999 and it is still alive pushing a dual-coil 8″ sub as we speak today!

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FREE AUDIO AMPLIFIER SOFTWARE

KA — Fri, 05 Mar 2010 04:04:03 +0000

i need to increase the input level on my sound card can you help me?

hey, i have an m-audio delta sound card – it’s output level is alright, but it’s input level (for example when i’m recording a microphone) is horrible! i get a really low signal – i tried playing around with the settings of the sound card but that didn’t help – i heard i should get an amplifier/pre amp for the sound card – does any one know of any cheap (or better yet free) software that does this? or any other solution besides this? thanks!

I bet your microphone needs “phantom power” (which most pre-amps can provide). Many microphones need power(volts) to operate correctly.

What other devices have you tried on the inputs?

My Software Amplifier

PRO AUDIO AMPLIFIER

KA — Sun, 28 Feb 2010 06:30:23 +0000

Car audio pros and experts question!?

Hi,

My upcoming car setup for my bmw is a JVC headunit, Rockford fosgate T20001 bd amplifier and maybe 1 Rockford T1 or T2 15″ or 2 Rockford T1 or T2 12″ subs, by the way what is better 1 15″ or 2 12″? where do i get more bang for the buck? but my main question is, do i need to upgrade anything in my car? like battery etc? i am not a carshow contestant, just for normal daily use and i dont really turn the system to the max, just average. 5***** for best informative answer. THANK YOU!

I’m going through the same process of upgrading to a massive sound system. Go with the 2 T2s in a ported box (unless you are crunched for space). You’ll make better use of your amp and you’ll get significantly more sound. These are my recommendations (most of which I am doing): ** Uprgrade the wiring of the “Big 3″ in your car (order about 12-15 feet of 1/0 gauge wire for it online for much cheaper than what car audio shops will charge you); **Find out the fuse rating of your amp, then look at the amperage rating of your current alternator. Most stock alternators are 65-90a. Your car needs about 50a to run all the electrical. Lets say your amp has a 150a total fuse. That means you need a high output alternator that will power 200a total (if you will never really push the system to full power, you can get away with a 150a alternator). So you’ll either need to get your current alternator rewound or buy a ho alternator. If you try to power that much with a stock alternator, your alternator will fry and you’ll have to get a new one anyway; ** Get a kinetik or optima battery. The hc1400 is a really good deal right now online. You need a battery like that to give it consistent and prolonged power.

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DIY AUDIO AMPLIFIERS

KA — Thu, 18 Feb 2010 15:03:01 +0000

Amplifier noise when signal is plugged in. Any suggestions as to whats wrong?

Recently, I made a DIY Lm886 kit, and everything measures right on the multimeter. It is also dead silent when I first plug it in indicating that I do not have a main hum or earth loop. My toroidal transformer is shielded and does not emit much electromagnetic fields, however when I plug it in with my source signal (computer) there is immediately audio noise. The noise frequency is random and does not sound like typical noise. It can also be drowned out if I put the input signal strength higher. Can this be caused by a cold solder joint? What are some ways to stop the audio noise? Thanks, any help is appreciated.

Make sure that the ground connection on the amp is the same than that of the computer. I mean the ground prong on each of the power plugs. Also ground the case of the transformer. I assume your amp is in a metal box providing shielding, and the box is also connected to ground (although the shield may not be really needed).
In addition to that, make sure that the cable connected to the computer is properly shielded, and the shield connected to the connectors.
If none of that helps, try to use a different source, like a CD or DVD Player. In some cases, the wall outlet may not be properly grounded.
There is another possible cause, some amps would oscillate with input applied. Since you built this one, if you had an oscilloscope and an audio generator, you could apply signal at different levels and frequencies, to check for possible instabilities. You would do that with different resistive and capacitive loads. Amplifiers that seem to stable with many combinations of input sources and output loads, are noticed to be unstable with, for instance, a square wave input signal. There is a lot that goes on the design of an amp.
Another thing, make sure you have connected decoupling capacitors across the amplifier’s power supply. You should use an electrolytic capacitor (i.e. 50 uF) in parallel with a ceramic capacitor (i.e. 0.1 uF), on both the + and – voltages if your amp requires dual power supply. Electrolytics have some inductance, so the ceramic would counteract that.
Add to your question, or email me if you need additional hints.

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AUDIO AMPLIFIERS CIRCUITS

KA — Tue, 16 Feb 2010 22:57:26 +0000

My speakers work for a split second without power?

I’ve noticed something odd. Sometimes when I turn my computer speakers on (and music is playing on my computer) but the speakers aren’t actually plugged in to the electricity, the sound comes out (at slightly, but only slightly, lower volume than normal) for about the first half a second.

How are my speakers working (ie amplifying the audio signal) without power for that short period?

I know how speakers/amplifier circuits work. They are basic computer speakers with just audio in, and power in from the mains. Build up of charge isn’t possible, right? They have been unplugged from the power for 2 days before I turned them on. And I don’t think I’m hallucinating.

Any ideas?

To be a bit more precise, there is a capacitor in the power supply that acts as a high-pass filter so the power supply doesn’t distort the sound from the speakers. When you turn off the speakers, a charge is maintained on the capacitor. When you plug in the sound, the amplifiers provide some throughput until the capacitor discharges.

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