Question about Ultra Linear UL-1600M Car Audio Amplifier

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Soung prob the rca ground leg was broke and had it fixed but now when i get it passed volume level 20 it sounds as if the woofer is overdrivin it self tryed swithing speaker leads around with no luck any ideas would help thanks

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Re: soung prob

I would replace the RCA for a new one, if the cable got damaged it may not be delivering the correct signal to the AMP causing the distortion.
New RCA cables are fairly cheap unless you go into PRO CABLES.

Posted on Sep 16, 2009

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Re: soung prob

Tune the gain on your amplifier powering the sub. Turn the Bass Gain on the amp all the way down and crank up your system to as loud as you can stand. Adjust the bass Gain until the Speaker begins to distort, then back off a little bit. This way you can crank it up and not get Bass Distortion early.

Posted on Nov 28, 2007

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1 Answer

Which inputs are the better connections to use, the low level (RCA), or the high level inputs that have the least engine whining noise?

The RCA connections are best. If you have electrical noise, make sure you have good ground contacts. I'm talking all of the ground connections in the vehicle. You can also use a ground loop isolater to prevent some noise.
Ground Loop Isolators (a page with some explanation/theory)
They can be bought pre-made for about $15 - $20. The one pictured is an example.


Oct 05, 2015 | Car Amplifiers

3 Answers

Another conundrum

To check for yourself, get an Ohmmeter and see if the outers of the amplifiers RCAs are connected to the ground or each other. If so then it cannot take speaker signals directly.
I suspect the 'High Level' the manual speaks of are the 4volt auxilliary audio signals that can be found on some newer head units, not speaker signals.
Speaker level signals from a bridge amp CAN be used on grounded RCA inputs if the signal is first passed through a simple decoupler and attenuator.
Diagram to explain....

Nov 22, 2007 | Infinity 475A Car Audio Amplifier

1 Answer

I have a quantum audio equalizer and the sub volume doesnt work wats the problem?

are you getting any sound at all out of your sub woofer? what about if you bypass the EQ? If you're getting sound but just not the control over it then the Potentiometer (the volume knob) is bad or has become loose from the connection to the board. More than likely you would not have any sound at all if it's loose. If you have no sound and you are not getting sound after bypassing the EQ then check your head unit settings to make sure that it is set to have full frequency output of the RCA's. It may be set for high pass which will filter out the low tones, leaving nothing for the EQ to work with.

Apr 02, 2013 | Car Amplifiers

1 Answer

Sound from amp sounds similar to an unravveled coil on the woofer. Tried a differen (known good) woofer Same problem. When volume is at very high leveles the woofer plays for a fraction of a second then...

i am having the same problem with mine was told that the amp is not pushen to the sub and to test it with another speaker if it does the same thing with the other speaker then it is the amp if it dont and the second speaker works then the sub is shorten out the amp so i wil have to replace the sub ...eather way if you bought this new they are gonna charge me 70 dollars to fix it they being alpine. I rather pay 70 then another 400 dollars good luck to you and wish me luck gonna hook it up to another speaker tonight

May 14, 2010 | Alpine MRP-M1000 Car Audio Amplifier

1 Answer

What speaker componets do need to buy?

  • 1000W max power
  • 165W x 2, 20Hz - 20kHz, @ 0.04% THD + N, at 4 Ohms
  • 200W x 2, 20 - 20kHz, @ 0.15% THD + N, at 2 Ohms
  • 400W x 1, 20Hz - 20kHz, @ 0.1% THD + N, at 4 Ohms
  • OTL (Output Transformerless) circuit
  • Pulse power supply
  • Line & High Level Inputs
  • .3-6V Level Adjustment Control (RCA Pin Jacks) 1.2-12V (High Level Input)
  • 80 Hz, -18dB/octave Low Pass Filter Switch
And i would say that the best use of this amplifier would be for sub-woofers.

Feb 19, 2010 | Sony Xplod XM-1652Z Car Audio Amplifier

1 Answer

Red light stays on no sound. rca cable grnd, must be connected?

What do you mean the RCA cables are'nt grounded? All RCA cable have a ground. What kind are you using? The round metal at the end of the RCA cable is the ground. The silver or outside of the line input on the amp is the ground for the RCA cables. Anyway, that would'nt stop your amp from coming on. I suggest you take a piece of wire and ground it to the amp and touch the metal piece on the RCA cable and see if you get sound. Even if the RCA cable is'nt grounded you would get some type of sound coming out of the amp maybe. If you do it will sound like it's cominf thru a long tunnel, like a reverb effect. I have never heard of an RCA cable not having a ground. ARE you sure you have RCA cables? Let me know and send me a pic if you can of the input of the amp so I can see how you have it hooked up.

Jan 07, 2009 | Kenwood KAC-9152D Car Audio Amplifier

1 Answer

No sound out of subs

Check the ohm of your soeakers again. If it doesn't say 2 ohm thats the prob. Keep in mind that 2 ohm can be any where from 1.7 too 2.3 but any reading on you DVOM that gives you two decimal places is also wrong. i.e. 2.17. This would mean that you have a woofer shorted.

If thats not it and you have already fixd a ground then use your meter to check the ground; to do this set the DVOM to ohms and touch one lead to a true gound, by that I mean scratch the paint and primer off of a spot you can hide untill you see bright mirror like metal. Then disconnect the ground wire from the amp and touch the other lead to it. You should read anything from 0.3 to 0.1 any higher and your ground isn't that great.

If thats not it, The only thing left is to hook the amp up out side of the vehicle away and not connected to ANYTHING that has to do with the car. Get a battery and a diskman or a playstation, anything that can pass sound out of RCA's (Maybe even a diff radio if poss). Hook it up. If it works its in the car and let me know. I'll tell you some more to check, If not its the amp. Good Luck

Dec 03, 2007 | AudioBahn A1300HCT Car Audio Amplifier

1 Answer

Orion 275g4 Hcca amp

this actually could be your amp...try turning the gain down slowly and you will hear the bumping either stop or become morelike music background thanmusic foregroud. i had this problem with an older amplifier and i fixed it by getting a larder power/ground wire size and decreasing the gain a little.

Sep 03, 2007 | Orion HCCA 275G4 Car Audio Amplifier

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