Question about Crate SPA1600 Power Amplifier - SPA Series Car Audio Amplifier

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Crate BT50 Bass amp cutting out with high input.

My Crate BT50 cuts out when I add distortion or drive it over a certain level, any ideas?

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Re: Crate BT50 Bass amp cutting out with high input.

Sometimes an amplifier's preamp can't handle certain signals/frequencies at a high gain, so they cut out. Bass guitars are especially prone to giving such a strong signal.
I bought an older, nonworking bass amp recently and fixed it just to find it had the same problem. Best solution is to put a low ohm resistor at the amps input, but if you turn your guitar down to half volume it'll have the same effect: should prevent it from cutting out.

Posted on May 20, 2008

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Speakers cutting in and out at high volume

The amp is going into protect on the two channels powering the speakers. Turn down the gain on those two channels. You also may want to consider crossing over the speakers a little higher than they are now.

The rating on those speakers are way too high. 6.5's and 6x9's will take 50-100 clean watts tops before they start to break up.

The best solution to get it perfect is....unplug the subs. Turn the gain on the speaker channels all the way down. Then turn up the deck 80% as high as it will go. Play a song. Then increase the gain on the amp until the speakers are as load as they go without distortion. Shut off the car, replugg in the subs and do the same thing. Gain on sub channels all the way down, deck then to 80%, find a bass heavy song, then turn gain up until subs become distorted. If you do this procedure your speakers and subs will be "gain matched" to the proper levels.

Good Luck

Dec 07, 2013 | Kicker IX500.4 4-Channel 500 Watt Car...

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Is the bass boost the gain or frequency knob?

Bass boost simply adds DB or gain to the bass signal. Some like it, some dont.
The frequency knob is the Low Pass Filter (LPF) that cuts off the amp output above
the set frequency. A bass system usually cuts off below 400 HZ and more often 200HZ.
A good, rattle your car bass note is in the 25-80HZ range or lower but most amps and audio
input devices cant attain a good low note with clarity.
"Low-pass filter allows only frequencies below the crossover point to be amplified. A high-pass filter allows only frequencies above the crossover point to be amplified - useful for keeping low bass away from small speakers, so they can play more efficiently."
Checkout Crutchfields Glossary of Car Amps.

Mar 14, 2011 | Rockford Fosgate Car Amplifiers

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Hi im after some help coz driving w/o music is no fun. Just done a sterio system upgrade to my car using mid-high end sony xplod components ie 6x9s in the rear, xm4s amp, 6.5s in the doors new head unit...

Congratulations on your new audio system. I will give you 4 scenarios: 1st. From your head unit, use the Fader to separate the front speakers from the back. (only front speakers playing) now using the balance separate the left from the right so only one speaker is playing. If the sound becomes more bass filled then you have a phasing problems which could cause cut out (protection) issues. Do the same for the back speakers, BOTTOM LINE: make sure that your connections from amplifier to speakers are all correctly connected where they should be.You will know that your speakers are correctly connected when the bass is richer while both speakers are playing as opposed to more bass when only one is playing. 2nd. Your head unit RCA output is of a certain voltage (V) [signal strength]. (1.2V, 2V, 4V, 5V) Lets say that your head unit has a 4V output, To match this up with your amplifier you must adjust the gain control on your amplifier to be at the 4V position. If your voltage output does not match your input voltage and the signal in result that is being sent is too high for the settings on the amplifier, you will over voltage your amplifier making it distort then heat up and most likely start cutting out to protect it self. this could also potentialy damage your speakers. 3rd. Check that the speaker cables are not shorting on metal anywhere, that includes the speaker terminals not touching the frame of the location that they have been installed. 4th. The cable size you are using is not adequate for the power needs of your amp. hope this helps. dreamsystems

Feb 13, 2011 | Sony XM-4S Car Audio Amplifier

2 Answers

I have a pioneer gm-x 304 amp. I want to know what are the lpf-off-hpf switches for< and what sdhould I set the input levels to?

Hello packs6,

The lpf-off-hpf switches control the "low pass" and "high pass" filters. When driving full-range or component speakers the filters are usually operated in the "off" position to send all frequencies to the speakers. When driving a subwoofer, the best position is "lpf". If you have a separate amp to power a subwoofer, this amp can be used just for the high frequencies by putting the switches in "hpf".

Input levels should be adjusted to match your receiver output. You don't want the levels so high that distortion results. But you want it high enough for the amp to be able to produce maximum output. Start at about midrange and adjust the receiver volume to a little higher than a comfortable listening level. Adjust the amp gain (level) counterclockwise until you begin to hear the speakers distort. The turn the control slightly clockwise until the distortion disappears. That's the best setting.

Hope this helps.

Sep 02, 2009 | Pioneer Car Amplifiers

1 Answer

Amplifiers GT Series GT5-A604 ........explain settings

the amp probably has a x-over knob, a bass boost knob, and an eq knob. the eq is probably an internal crossover switch that will take the output from either high range (tweeters) or full range (6x9s) or low pass (subs) leave it on low pass. the bass boost however, will add distortion if turned up too high. its not noticable in the car, actually it sounds louder in the car but if you open the trunk and listen, you can tell its distorted bass and actually frying your speakers. the x-over knob is used to tune the frequency at which the amp stops pushing out bass tones. if you like rock music loud, turn it up higher, if you like low deep rap bass, turn it lower. keeping it too high might give you bad sound from either type though. ALSO THE GAIN OR LEVEL.IT IS NOT TO MAKE YOUR SUBS LOUDER IT WILL BLOW THEM .the gain is used to set your amp to your head unit which there is a procedure to do it.

Jun 15, 2009 | JBL GT5A604E 4-way Car Amplifier

1 Answer


you need to get a bigger ground wire and the cut in and out will stop the cutting in and out is the protection mode starting if it cant hold the thump a capacitor 2farad will hold the bass
hope this helped

Feb 15, 2009 | Eclipse Premium 34230 Car Audio Amplifier

1 Answer

Need specs and wiring options

Eclipse 36401 eclipse%20pa36401.jpg
  • 105W x 4 Channel Max. Power Output at 2o.gif Stereo
  • 60W x 4 Channel 0.1% THD at 2o.gif Stereo @13.8V (RMS Continuous Power)
  • 40W x 4 Channel 0.1% THD at 4o.gif Stereo @13.8V (RMS Continuous Power)
  • ChannelFlex Crossover
  • Adjustable High-Pass Frequency (50-200Hz, L/R Independent)
  • Low-Pass Frequency (120Hz)
  • Adjustable Bass-Boost Level (45Hz, 0-9dB, F/R Separate)
  • High-Current, High-Speed Output Devices
  • High-Efficiency, High-Energy MOS-FET Power Supply
  • Audiophile Grade Component Selection
  • Intelligent 7-Way Discrete Protection Circuitry
  • Noise Reduction with Low Distortion & Ultra-Low Negative Feedback
  • High-Level Input - Add on Capability
  • Epoxy Composite PCB
  • 2o.gif Stable Design
Each 6 1/2" speaker will see 40 Watts
Each 6"x9" will see 521/2 Watts

Yes your solution is correct. Front wired in stereo, bridge rear.

Dec 29, 2008 | Eclipse Car Amplifiers

1 Answer

Amp cuts out at certain volume

is the output signal distorted? if not one of the subs could be damaged subs are capable of playing even when damage ,try them 1 at a time to see what happens.

May 17, 2007 | Kicker 04KX350.2 Car Audio Amplifier

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