![]() ![]() With the other amp it was impossible to damage the drivers. If we pushed the volume any higher, we could have damaged things. According to the internal volume control, we were at about -20 to -15 dB. This past week during testing of the stock amp the drivers would start reach maximum excursion on War of the Worlds and other low bass material during playback in JRiver. During our KC Subwoofer GTG a few weeks ago, this system had a maximum output level of 116 dB while other systems with more capable drivers and when calibrated the same, had a maximum output of over 123 dB. The drivers never made any funny noises and most of the dynamics were maintained. During playback of bass intensive material, the limiting on the amp would start when we reached about -15 to -10 dB on the volume control depending on the bass levels in the movie. In this system you would calibrate your receiver so that the test tone playback at 0 dB on the volume control would be 85 dB (or 75 dB depending on receiver). The modded amp was modified with a regular home theater system in mind. I was not able to implement any sort of limiting that worked. It only took a few minutes of using the RTA function in REW while playing the REW generated Pink Noise PN file back through JRiver and making adjustments in the PEQ. I was able to use the Linkwitz Transform in JRiver to match frequency responses exactly. I think I read it takes about two hours to modify one amp. These were implemented my means of changing resistors, etc. ![]() One had the frequency response adjusted using essentially a Linkwitz Transform and limiting done by Seaton Sound. This week I measured the frequency response and tested the maximum output of two Dayton SA1000 subwoofer amps. I thought that was caught by the clip protection. At a certain point the limiter would kick in and prevent one from sending too high of a signal to their gear. Rather than raising the input level in the limiter, the internal volume control would raise the input level. This allows the limiter to kick in only when the volume reaches a certain level. In order to effectively mimic the limiter on a pro amplifier, JRiver needs to provide a limiter after the internal volume control. I know this is self-evident, but it helped me think the issue through. Second, any limiting in the DSP studio is affecting the waveform regardless of volume level. There is a nice wave graph in Elephant that shows you exactly how much of the signal is being limited. This allows one to limit the LFE channel by compressing everything over a certain amount. By being able to increase the input gain and decrease the output gain by the same amount, you can push the content higher to make the limiter kick in. With the current method with JRiver's limiter, the limiter only kicks in when the signal is clipping. I learned a few things that may be helpful.įirst, Elephant has the option to increase the input gain while simultaneously decreasing the output gain. I played around with Voxengo Elephant today. Would this work? It would be easier if we could specify the upper and lower frequencies we want to use in the limiter itself. Add User1 and User2 back to the subwoofer channel. The only way I can think to do it is to move the subwoofer channel to User1 and User2, run a low pass and limiter on User1 and high pass on User2. I would like to use the limiter on frequencies below about 30Hz. Is there a way to specify or use it for anything over -10dB, for example? The limiter seems like it works on anything going over 0 dB. Below 30 Hz I need to use the limiter for content that is above -10dB. The subwoofer will not reach maximum excursion with that power until below 30 Hz. Here is my scenario: I have a subwoofer that is able to get an actual 500 watts from my amp. Is there a description for each setting available? Knowing what they do would help implementing the limiter. I looked up some other limiters and found info on the attack and release, but not the hold. I couldn't find anything in the Wiki on how to use the Limiter.
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