I have two other gain adjusters for the other 4 channels and the highest reading i get on either of them is 42. Brent, It'll work either way, but most people prefer setting amp gain quietly, with the speakers disconnected, if possible. Care to recommend any? And you didn't say what the impedance of your subs are. Glennon, Not knowing exactly what amplifier you have makes it impossible to give advice on how to wire subs to it. gain setup system includes test tone CD; test tones also available as MP3 download from Amazon On Demand, Rhapsody, Google Play, and Spotify, labeled “3sixty.3 setup disc” (Punch amps and the 3sixty.3 use the same test tone tracks for setup) (PS: producing 300 watts through a 2-ohm load takes 24.5 volts.). I am very pleased with the arrival time of my car stereo, very easy website to maneuver, and a quick fast checkout. Any waveform distortion I then saw came from the amp, not the receiver. Surely these speakers should be able to take about 35% of HU volume with no eq boosts and the amp gains turned down. Is it at 0db or -10db? This is because most meters are made to measure AC voltage accurately at 50-60 Hz (the common frequency of all power systems around the world). Power from Batt measures 14.2 at the amp. So using test tones and listening to them through the car speakers does NOT damage the speakers? And lastly, which is better? Natasha, Give us a call so an Advisor can help you match an amp to your subs. For Tech Support, call ... Rockford Fosgate P300-10 Punch Single 10" 300 Watt Amplified Subwoofer Doing so will virtually guarantee your amp will clip the signal when the receiver's volume is turned up later. With the proper setup routine, we can help compensate for this anomaly by over driving the amplifier’s input stage by calculating the amount of “gain overlap” needed. Never run wires underneath the vehicle. C. L. E. A. N. gain setup system test tones available as MP3 download from Amazon On Demand, Rhapsody, Google Play, and Spotify, labeled "3sixty. Regardless, can someone please please pretty please tell me once and for all what I'm suppose to do with the crossover on my amp when playing test tones to set my gains. Also, if I want to leave some room to play with for my subs, I'm assuming I should set the HU's sub control to its max or at least whatever number I want to use as my max when setting the gain, correct? Read More. Are other 5 1/4" speakers able to reproduce 80hz -3db sine waves without distorting at 35% HU volume? Running the wires inside the is active. Raise the amp’s gain until you hear it buzz, back off until it hums, and you’re done. Mixing differently voiced subs in a system together often results in less than-ideal-sounding bass. When it distorts, you can clearly hear it buzz. You should leave the receiver set at its maximum clean output in order to achieve optimum amp gain setting. Knowing which model headphones you’re using lets us remove any sonic coloring from your experience. And now it doesn't sound nearly as good but an R&B it's definitely louder and shakes everything more. Robert Stevens February 12, 2020. Robert Stevens February 12, 2020. If you go that route, immediately save to your laptop incase things get messed down the road. 0dBFS: Designed for audiophile applications to give you distortion free … Thank you....do i need to connect the amp wires in series?? It's a focal amp, 70 watts rms x 2, and it's pushing morel maximo 6 components. Chris, Crackling and buzzing, especially that change when the lights are on, are usually caused by a loose ground or power connection. C.L.E.A.N. I get up to 7 but ohms law calls for 14.14. That said I then went on to check the output voltages after all had been set with lovely sine waves on the scope. Set your receiver’s EQ presets and the amp’s bass boost to the way you normally listen to your music. i found my limiting Hz and volume level. It does not take into account whether the source signal is clipped or not. For a more detailed explanation, see my article about Tuning your subwoofers. Next, you turn up the amp's gain until you hear the distortion again, then back it off slightly, and you're done. On the second day, it ended up that I could turn it up to 52, and get 18.8 VAC at 100 Hz, or 88 watts. Or is it in some way different from the gain control dial on the amp? I turned up the gain to the amp’s top clean-playing point and read the volt meter. What was going on was the power supply the receiver and amp used was 13.5 volts DC, about the same as a running car’s system usually provides, but the amp wasn't connected to the speakers and so wasn't loading down the power supply with the increased current demand of the speakers. Rockford Fosgate P3D2-12 Punch P3 DVC 2 Ohm 12-Inch 600 Watts RMS 1200 Watts Peak Subwoofer. Monty, Googling "download 0dB test tones" brings up quite a few reputable sites where you can download tones and purchase test tone CDs. Oh and I have the two 12inch MTX Terminator subs in a box whats a good amp? 99. By using test tones played through a speaker, I wondered how accurately I could set an amp’s gain as compared to setting it by the other methods. I don't know of any 5-1/4" speaker that can play bass tones very well, in spite of their specifications. For over 40 years Rockford Fosgate has made lifestyle products that deliver the audio experience in cars, boats, and recreational vehicles. I would recommend setting gains to music, not tones, with a flat EQ. In other states where we don't collect sales tax, it may be the customer's responsibility to assure that all appropriate state use taxes are paid. I've heard clipping the sound will wreck your tweeters. Humming and buzzing can be clearly distinguished. The male singer's voice suddenly developed a rasp. Shop for rockford fosgate at Best Buy. Download this uncompressed low-distortion WAV file for measuring your system distortion level at 1KHz, beginning from the digital source: 1KHz / 0db tone @ 192KHz / 24bit samples - 60 seconds duration (zipped) Below is a sample measurement on Macbook 12" with internal loopback in place with the above WAV file as a sour SpeakerCompare simulates the sound of home and car speakers through your headphones. The instructions for the LC7i say that its gain should be set high and the amp's set low. What size of wire should you should use when installing an amplifier? Tendai, The gremlin's in your multi-meter - it's only accurate at 60 Hz. How do you prevent the other speakers in the car from not playing the test tone? Adding boost, at any frequency, after setting the gain, can make the amp clip, distorting the sound and endangering speakers and subs. But the answer to your question is that to put out 100 watts RMS through a 3-ohm load takes 17.3 AC volts RMS. Robert Stevens February 12, 2020. If you were to have the gain somewhere else but still on the lower end, (say 10% or 20%), would the distortion point on the HU vary in any way? It didn’t "clip" at the top and bottom, it distorted in the middle. The first time, the receiver's maximum volume setting ended up one notch below the tones and scope setting. then enter to win a $350 gift card. Comments will display after being approved by our moderators. Cory, Using a manufacturer's claimed ratings to set amp gain by voltage sometimes results in a mis-set situation which could endanger speakers. Please enter your email address below. For instance, the Amprobe 15XP-B multimeter I used in this Labs demonstration reads the voltage of a 0 dB 1 KHz signal about one-fifth the level that it reads at 40 Hz or 100 Hz. This guide will help you choose the right amplifier for your car's sound system. Brian, Finding the maximum clean volume of your receiver is unaffected by the amplifier's gain setting. And remember, DMMs only accurately measure AC signals round 60 Hz, so they're not the best tool to set amp gains with. Then, I needed to use that receiver volume setting at that tone’s frequency to set the amp’s gain. If you want only one speaker to play, use the balance and fade controls of the receiver to send the sound where you want. Set the gain and filters of your amp with either the method outlined in this article, or by the Auto Setup process, but not both. In the Crutchfield Labs, I ran a set of tests and determined that "doing it by ear and music" works, but not quite as accurately or scientifically as using test tones. Thanks again. When in doubt, start at 100 Hz and then tweak to taste. Audio Test Tones are for the the experts among our readers. I don't have a dummy 2 ohm load rated for that kind of power. It was very easy to discern when the hum distorted into a buzz. The voltage equals the square-root of the product of the wattage times the speaker’s impedance (also usually 4). Ryan, Just because two stereos have the same output voltage rating, doesn't mean they play at the same volume. Great info. When tuning the amps do you have the filters off? Thank you for your time and for sharing your knowledge! You can measure the signal's peak-to-peak voltage with your scope, as well as see when it clips. Each tone creates a reference-level (0 dB) sine wave that you can observe on an oscilloscope screen. Designed by fanatics for fanatics, with advanced engineering and research and development Rockford remains at the forefront of audio, a title they have held high since day one of the Car Audio Revolution. A coil's impedance actually changes according to the frequency of the signal played. What the heck is going on? It's fairly easy to create them, but took me a long time to get it working right. This method can produce high-pitched, annoying, ear-drilling sounds that could hurt your hearing if you expose yourself for too long, and definitely will bother everyone within listening distance. A test tone is a single note played at a specific frequency, and is typically found on a level-setting disc, but can also be found online for downloading. It means ATTITUDE! This amp has a gain control, a bass boost control, and an external remote level control. Wowzers. Check out Tuning your subs for that. i installed Infinity Reference 6532ix's (coaxial) in the rear door of my 2016 Chevy truck and Infinity Reference 9630cx's (components with passivize crossovers) in the front. And also should the subwoofer be turned off when finding out the max clean volume level that your head unit clips at? • There all 30 seconds long • Each zip ranges from 20hz to 65hz with 3hz increments • Zip files are uncompressed, so the file size is kinda big(45mb) • Each zip contains a … I played the first tone, 40 Hz, a low bass note, only fit for subwoofers, and set the scope to view the sine wave. This really helped me in so many ways !!! Playing a distorting tone loudly might eventually damage a speaker, but not for the short time needed to set an amp's gain. Also if you know of a CD that has 0 Db test tones. Can you give some suggestions on Oscilloscopes such as types, brands, models? Thnx. by Crutchfield's Amp - Alpine PDR-V75 (gains set low - no "Bass boost" or HPF applied) When looking at the tones of the Amp with an Oscilloscope do I hook up the Scope to the speaker output with no speaker attached? Thanks for sharing your knowledge! You’ll feel your music’s impact better and hear exciting details that otherwise would get lost in your car. Using -3db sine waves in the 60- 100hz range, my woofers began buzzing at approx 35% HU volume. It was a nice discovery! Crutchfield: Audio, video, and more. Anthony. Then I backed it off until the hum alone remained. Pioneer TS-SW2002D2 Review. That meant the receiver played 40 Hz clean and at its loudest at its "52" volume. This must be due to the low input impedance of the scope giving unrealistic output from the amp. Find the receiver's highest clean volume, then the LOC's, and then the amp's. Different meters will have different degrees of deviation. Do you leave it at the same max level as you just found? Your description of ringing ears from setting your gain by this method does not sound fun... Brian, The spikes you see are probably more an artifice of your oscilloscope's response-time than the clipped signal's harmonic radiation. A lot on online videos about setting amp gain reference using 40Hz and 1kHz test tones with your everyday multimeter. It means POWER! So once gains are set, do you then reduce the sub amp gain until it sounds matched with the lower power amplifier ? One question, where do you have the receiver volume at for the amplifier portion of the test? We’ve carefully chosen the components of this kit to ensure a crystal-clear listening experience. Using a standard hand-held multimeter to measure the voltage of a higher-frequency signal results in readings that are much lower and leads to inaccurate power calculations. At first, I played a favorite R&B-type song full of percussion, bass, horns, and lots of production — but I couldn’t hear it distort, only get loud. I let the amp run it's auto tune with the gains all the way down and again using a pink noise tone over bluetooth from my phone. How long is Crutchfield's return policy? I am not going to use the 45 Hz bass boost and will just leave that dialed all the way down to minimum. My JBL 2402 tweeters was replaced with new Diaphragms I am Try amping with a all tube Lucman 3 Way Active Crossover and use a 211 Power out Valve amp for my tweeters 16 Watts class a per channel my tweeters volume is very low even with my years very close to it how can I improve the gain onu tweeters. For those, people often use pink noise and an RTA (real-time analyzer). The 100 Hz tone alone will do for both subwoofer and full-range speaker amps. We are here to help, troubleshoot and make sure you get the most out of your Rockford Fosgate system. Cheers. hello, My head unit preout is 4V and my 4-ch amp gain setting is 4V at full counter-clockwise and 150mV at full clockwise. What wiring do I need? These formulae are based on Ohm’s and Joule’s Laws and you can’t break them if you tried. Sign up for our emails, I'd purchased a DSO 112 O'scope which was en route when I asked. Dominic, I really don't know enough about test gear to make any recommendations for an oscilloscope. Is there a family of gremlins in the amp? It's through the magic of each manufacturer's design that it's done. Ashay, Yes, that's the way to proceed. Rockford Fosgate, Page 4 - Rockford Fosgate Corp. Forum: Register: Upgrade: Amp Guts Gallery: Free Test Tones: Contact Us : AmpGuts.com > R: Rockford Fosgate ... » Test Tones » Auto Insurance » Forum > User CP > FAQ » Recent Threads: No Threads to Display. Then, while playing music I could use the remote knob to turn down the bass to desired levels, knowing that I could not worry about turning it up to max if desired. They don't hurt at all. They actually pay me to ramble on, rant, and explain the things I love about music, electronics, and getting good sound. That it is the only one currently available for sale with the full specs made the decision easier too. 14.14 volts through 4 ohms of impedance creates 50 watts of power. Is the amp working harder in the first scenario vs the second? Crutchfield has always delivered! I belong to a culture of fine sights and sounds, and I like spreading the word. Is that the right approach? Using test tones and your ears means it doesn't matter what an amp or receiver's visual display or markings show while setting gains. Pete, That sounds right to me. Ray, There are a few short-falls to using multimeter readings to set gain, instead of your ears. The 40 Hz tone couldn't really be reproduced by the speakers, so was useless. We engineer the best audio systems for your lifestyle! Hey Buck, fantastic article! JL Audio j2 500.1 monoblock but the rears do not. Now i realise why my system sounded like rubbish when i set amp gains with receiver full tilt and no test tone Cd. Thanks I cant use cd's on my stereo, so im going to download some tones and play them via usb and the use a oscillioscope. James, I don't recommend using a multi-meter to set an amplifier's gain because it'll only read voltage accurately around 60 Hz (maybe 40-100 Hz) and can't tell you if the signal's clipped or not. But seeing as most people don’t have oscilloscopes, I thought that maybe by listening to the tones through speakers, one could also set an amplifier’s gain correctly. In addition, I also have my HU's HPF set to 80hz with an -18db cutoff slope so they aren't even running "full range". Two hours later, my ears were still painfully ringing from the very high 8K Hz tone. The different recording levels are designed to give you the perfect gain match for your application. Personally, I think using test tones and listening for the buzz is an easier and more accurate method for setting an amp's gain. Butch, I think you're referring to an amp gain setting technique that uses a volt meter to attain a target output voltage that matches the desired output wattage. Authorized NOTE: When utilizing high-level for input signal the auto turn-on feature Rockford Fosgate Dealer for installation. I'm putting one in my bike, just not ready for it yet. Since I think the subs will prob Be around 70-80hz LP, the mids 100hz HP and the tweeters 1.5k HP. At 100 hz, 800 hz, and even 8,000 hz, I can turn the gain to about 3 o'clock before I hear any change/distortion. Do you have any experience with these speakers (Morel Tempo Ultra Components)? I took note of what the receiver’s volume reading was: 52. Seems strange since both channel's wire is run side by side on the passenger side. View and Download Rockford Fosgate PBR400X4D quick setup manual online. But should I always set the amplifier's output to the proper voltage for my speakers using Ohm's/Joule's Laws? I started with the amp’s gain set to its minimum, and the speakers disconnected. 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N'T know of any reason to use a DMM receiver set at its at! Mean they play at the lowest volume setting fair enough, can get... To taste of a CD or store them onto a thumb drive for playing later sub woofer, and! 100 watts RMS through a 2-ohm sub, for example, will result a... 40Hz and 1kHz test tones and scope setting according to the left driver and the informative article the methods... Are working to ship current requests and make more relative setting of the volume until could...