So if im understanding correctly the input sensitivity setting is the limiter threashold level. Does that mean the ceiling or loudness level is lowered only increasing saturation and distortion?
Input sensitivity of the amp is the level you use for gain structure purposes. For example, if the input sensitivity is 1.2V (which is about +4dBu), then you adjust the input attenuation knob on the amp to compensate for the incoming signal. So if a mixer is feeding the amp directly, and the mixer can output up to +20dBu, then you would need to set the amp's attenuator knob to "-16dB". This lowers the 20dBu signal down to 4dBu so it doesn't overload/clip the input of the amp. And now you can run the mixer up to its clip level without worrying about clipping the amp's inputs.
@@phy350 the studio monitor have the amp inside the box. With switches on the back outside. The switches are for bass shelf. Rolloff. Trebble shelf. And input sensitivity. The options for the input sensitivity are. 1. Unbal 2. +2db. 3. 0db. 4. -2db 5. -5 db. Im running the audio to it through xlr cables from asoundcraft mixer. What would be the correct way to gain stage. Set mixer faders to 0. And then adjust input sensitivity until l.e.d. indicator flashes red.
@@hoodknown5875 Since you're using powered monitors, you'll have to look up the specs in the manual or spec sheet. It should tell you the max input level in dBu of the XLR input. Since the amp is built in, it will probably just give you the max dBu level rather than an input sensitivity spec (you only really see the voltage input sensitivity spec on standalone amplifiers). I would expect the monitors' max input level to be more in line with typical pro audio line level gear, so somewhere in the upper teens or low 20s dBu. But don't take my work for it... always read the manual! :)
I have a Crown xli800 connected to a Marantz Receiver SR7000 I just want to know which setting is best the .775v or 1.4v connected with RCA Cable. I read a Review that he used the .775v setting so I switched to that the previous owner had it at 1.4 for his small Magnapan speakers. I will be connecting this to a 4ohm 8in Turbo sound speakers, but for now i am in MONO Bridged for my 8ohm Martin Audio BlacklineX series 15" speakers.. Your Math coarse is just not giving me any answers.
The Crown amp's two settings (.775V or 1.4V) are for its input sensitivity. This is, essentially, the clip level of the amplifier. 0.775V is 0dBu, while 1.4V is 5dBu. You'll have to look up the specs on the Marantz to see what output level you're sending over which RCA output. Based on that level, you will then adjust the Crown's attenuation settings for proper gain structure. The Marantz likely has levels listed in dBV not dBu so you'll have to adjust accordingly (0dBV = 2.2dBu). For example.. if your Marantz outputs up to 5 dBV maximum (again, you need to verify what the actual levels are, I'm using 5 as an example ONLY) that means it would be 7.2 dBu. If the amplifier is set to 0.775V, it can handle 0dBu maximum so you need to set the amp's input attenuator to -7dB (or -8 to be safe) to compensate for the difference in level between the Marantz's output and the amp's input capability.
@@phy350 I found a blog He said the Marantz was 1.2v & that setting the Crown to 1.4v was a safer choice,good to know which way is safer, but that also lowering the Amp Gain to 70% will also prevent clipping & Damage, other stuff on Ceramic Turntable Needle & that what the Component is sending into the Receiver matters as a Digital Source but analog is fine. My Laptop is connected to the AUX because the remote don't work & he has all CD & DVD set up for fiber optic connection.When I use 1 of the Crown XLi800 in Mono to power a JL Audio 15" 4 ohm Sub, I think & gladly to know I will set it to the "SAFER" 1.4v Thankyou for the reply & being helpful PHY
To convert volts to dBu, the formula is 20*log(V / 0.775). So if your amp's input sensitivity spec is 1.0V then its corresponding dBu value is 20*log(1/0.775) = -2.2dBu. See also by dB video for more info on volts to dBu and vice-versa: ruclips.net/video/dN9FXLAmMZ4/видео.html
An archived brochure I found (www.fullcompass.com/common/files/62-CrestCA18Brochure.pdf) has a chart that tells part of the story. If you have different sensitivity settings, that just changes the dBu level for your gain structure settings. For example, .775V = 0dBu, 1.4V = 5dBu. If your mixer has a max output of, say, 20dBu, and you have the amp set to .775V, you would need to set the input attenuator to -20dB on the CA18 amp. If you have it set to 1.4V, you'd set the input attenuator to -15dB. That said, the brochure I reference above has X20 and X40 settings, which are fixed voltage gains (not fixed sensitivities). When the voltage gain is fixed (as you might want for certain applications), the input sensitivity changes depending on the amplifier's load and the wattage. That's when you need the fixed gain formula (explain around the 3 minute mark). There's a chart on that brochure which gives you the sensitivity in volts for the X20 and X40 settings. Convert those volts to dBu, and you'll have the info you need for gain structure purposes. Factory Standard X115 .775V = 0 dBu Option 1 X40 2.24V = 9.2 dBu Option 2 X20 4.47V = 15.2 dBu But of course this chart is only valid when you have an 8 Ohm load connected to the amplifier. 4 Ohm loads? Time for some math!
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So if im understanding correctly the input sensitivity setting is the limiter threashold level. Does that mean the ceiling or loudness level is lowered only increasing saturation and distortion?
Input sensitivity of the amp is the level you use for gain structure purposes. For example, if the input sensitivity is 1.2V (which is about +4dBu), then you adjust the input attenuation knob on the amp to compensate for the incoming signal. So if a mixer is feeding the amp directly, and the mixer can output up to +20dBu, then you would need to set the amp's attenuator knob to "-16dB". This lowers the 20dBu signal down to 4dBu so it doesn't overload/clip the input of the amp. And now you can run the mixer up to its clip level without worrying about clipping the amp's inputs.
@@phy350 the studio monitor have the amp inside the box. With switches on the back outside. The switches are for bass shelf. Rolloff. Trebble shelf. And input sensitivity. The options for the input sensitivity are. 1. Unbal 2. +2db. 3. 0db. 4. -2db 5. -5 db. Im running the audio to it through xlr cables from asoundcraft mixer. What would be the correct way to gain stage. Set mixer faders to 0. And then adjust input sensitivity until l.e.d. indicator flashes red.
@@hoodknown5875 Since you're using powered monitors, you'll have to look up the specs in the manual or spec sheet. It should tell you the max input level in dBu of the XLR input. Since the amp is built in, it will probably just give you the max dBu level rather than an input sensitivity spec (you only really see the voltage input sensitivity spec on standalone amplifiers). I would expect the monitors' max input level to be more in line with typical pro audio line level gear, so somewhere in the upper teens or low 20s dBu. But don't take my work for it... always read the manual! :)
I have a Crown xli800 connected to a Marantz Receiver SR7000 I just want to know which setting is best the .775v or 1.4v connected with RCA Cable. I read a Review that he used the .775v setting so I switched to that the previous owner had it at 1.4 for his small Magnapan speakers. I will be connecting this to a 4ohm 8in Turbo sound speakers, but for now i am in MONO Bridged for my 8ohm Martin Audio BlacklineX series 15" speakers.. Your Math coarse is just not giving me any answers.
The Crown amp's two settings (.775V or 1.4V) are for its input sensitivity. This is, essentially, the clip level of the amplifier. 0.775V is 0dBu, while 1.4V is 5dBu. You'll have to look up the specs on the Marantz to see what output level you're sending over which RCA output. Based on that level, you will then adjust the Crown's attenuation settings for proper gain structure. The Marantz likely has levels listed in dBV not dBu so you'll have to adjust accordingly (0dBV = 2.2dBu).
For example.. if your Marantz outputs up to 5 dBV maximum (again, you need to verify what the actual levels are, I'm using 5 as an example ONLY) that means it would be 7.2 dBu. If the amplifier is set to 0.775V, it can handle 0dBu maximum so you need to set the amp's input attenuator to -7dB (or -8 to be safe) to compensate for the difference in level between the Marantz's output and the amp's input capability.
@@phy350 I found a blog He said the Marantz was 1.2v & that setting the Crown to 1.4v was a safer choice,good to know which way is safer, but that also lowering the Amp Gain to 70% will also prevent clipping & Damage, other stuff on Ceramic Turntable Needle & that what the Component is sending into the Receiver matters as a Digital Source but analog is fine. My Laptop is connected to the AUX because the remote don't work & he has all CD & DVD set up for fiber optic connection.When I use 1 of the Crown XLi800 in Mono to power a JL Audio 15" 4 ohm Sub, I think & gladly to know I will set it to the "SAFER" 1.4v Thankyou for the reply & being helpful PHY
Sensitivity 1.0V?
To convert volts to dBu, the formula is 20*log(V / 0.775). So if your amp's input sensitivity spec is 1.0V then its corresponding dBu value is 20*log(1/0.775) = -2.2dBu. See also by dB video for more info on volts to dBu and vice-versa: ruclips.net/video/dN9FXLAmMZ4/видео.html
When does someone determine whether or not to change the sensitivity of a ca18? I have one which gives me the options to change from .775-1-1.4
An archived brochure I found (www.fullcompass.com/common/files/62-CrestCA18Brochure.pdf) has a chart that tells part of the story. If you have different sensitivity settings, that just changes the dBu level for your gain structure settings. For example, .775V = 0dBu, 1.4V = 5dBu. If your mixer has a max output of, say, 20dBu, and you have the amp set to .775V, you would need to set the input attenuator to -20dB on the CA18 amp. If you have it set to 1.4V, you'd set the input attenuator to -15dB.
That said, the brochure I reference above has X20 and X40 settings, which are fixed voltage gains (not fixed sensitivities). When the voltage gain is fixed (as you might want for certain applications), the input sensitivity changes depending on the amplifier's load and the wattage. That's when you need the fixed gain formula (explain around the 3 minute mark).
There's a chart on that brochure which gives you the sensitivity in volts for the X20 and X40 settings. Convert those volts to dBu, and you'll have the info you need for gain structure purposes.
Factory Standard X115 .775V = 0 dBu
Option 1 X40 2.24V = 9.2 dBu
Option 2 X20 4.47V = 15.2 dBu
But of course this chart is only valid when you have an 8 Ohm load connected to the amplifier. 4 Ohm loads? Time for some math!