Are there any pre amps that will take rca line level and bring it up to xlr voltage output?
What I have is home audio set up. Multiple power amps and speakers for moderate volume levels.
Those will be used 80% of the time.
I am looking to integrate a pair of pro audio speakers.
Yamaha dxr12 or qsc.. whatever. Will chose later.
Those will be used for dances 2-4 hours.
More like sound reinforcements.
Problem is its a about 100-150 foot run from preamp to powered pro audio speakers.I think I need to use balanced lines.
I've seen few passive preamps for 60-100$. Do they actually boost rca line level voltage up to xlr voltages?
It's a 110 x 30 feet x 20 feet space.
I'll have 3 pairs of home audio tower speakers to take care of bsck ground music. But during wedding I am sure I'll need pro speakers to achieve higher spl.
Reason I went with home audio is that owners really want superb sound quality. 80-90% of the time audio will be at low levels. Restaurant bar levels.
What I have is home audio set up. Multiple power amps and speakers for moderate volume levels.
Those will be used 80% of the time.
I am looking to integrate a pair of pro audio speakers.
Yamaha dxr12 or qsc.. whatever. Will chose later.
Those will be used for dances 2-4 hours.
More like sound reinforcements.
Problem is its a about 100-150 foot run from preamp to powered pro audio speakers.I think I need to use balanced lines.
I've seen few passive preamps for 60-100$. Do they actually boost rca line level voltage up to xlr voltages?
It's a 110 x 30 feet x 20 feet space.
I'll have 3 pairs of home audio tower speakers to take care of bsck ground music. But during wedding I am sure I'll need pro speakers to achieve higher spl.
Reason I went with home audio is that owners really want superb sound quality. 80-90% of the time audio will be at low levels. Restaurant bar levels.
The simple fact of using a balanced out conversion, I mean adding the inverting amplifier boosts the signal 2 times. As the speakers have gain control to compensate, you can cheat and try to add a simple resistor equal to the preamp out to the inverting pin and tie it to ground.
Balanced Transmitter and Receiver II
Balanced Transmitter and Receiver II
Not sure I understand. I think u are talking about xlr to rca level. I need rca to xlr level. I think xlr Is about twice the voltage.
At the moment I am thinking of rolls m15b.
https://www.bhphotovideo.com/bnh/co...FO6N8kzKEqtRBoC3hHw_wcB&is=REG&m=Y&sku=217366
Eventually I'll need microphone preamp and mixer. But now just need to be able to play cellphone -> dragonfly audioquest DAC--> preamp --{ home audio amps and powered pro speakers
Many powered speakers have rca inputs. But I have 100-150 cable runs to speakers.. so I think I should go with XLR . Unless someone had really good luck with such runs using rca
At the moment I am thinking of rolls m15b.
https://www.bhphotovideo.com/bnh/co...FO6N8kzKEqtRBoC3hHw_wcB&is=REG&m=Y&sku=217366
Eventually I'll need microphone preamp and mixer. But now just need to be able to play cellphone -> dragonfly audioquest DAC--> preamp --{ home audio amps and powered pro speakers
Many powered speakers have rca inputs. But I have 100-150 cable runs to speakers.. so I think I should go with XLR . Unless someone had really good luck with such runs using rca
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"semi-Pro" (TASCAM) RCA to +4dBu is a 12dB (11.79dB) step-up. (Do not get tangled in the -10dBv vs +4dBu numbers.)
Hi-Fi RCA is not standardized "semi-Pro" RCA, but similar.
Yes, the Rolls MB15b will work for you. Bonus: it has level-knobs so you can get a good level. Minor drawback: this is a 2-Way 4-Channel box, you only need 1-Way 2-Ch. However the added cost is tiny; they may not even make them that way because the usual need is to convert both ins and outs of a box like a stereo tape deck or processor.
ART and Rane also make such things. Personally I like these brands better, just my taste. But the level/plug converter is something I am sure Rolls does fine. The price looks fine also.
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> balanced out conversion, I mean adding the inverting amplifier boosts the signal 2 times.
There's many ways to do this. Yes, an added inverter likes to add 2X/6dB. However it is not certain that an RCA output can drive one side of a balanced line. We often buffer, and can put gain (or loss) in that. OTOH you can use a 600:600 transformer for unity 0dB level, though not all RCA outs can drive that.
The +12dB RCA to XLR with a couple beefty opamps usually works good.
Hi-Fi RCA is not standardized "semi-Pro" RCA, but similar.
Yes, the Rolls MB15b will work for you. Bonus: it has level-knobs so you can get a good level. Minor drawback: this is a 2-Way 4-Channel box, you only need 1-Way 2-Ch. However the added cost is tiny; they may not even make them that way because the usual need is to convert both ins and outs of a box like a stereo tape deck or processor.
ART and Rane also make such things. Personally I like these brands better, just my taste. But the level/plug converter is something I am sure Rolls does fine. The price looks fine also.
_____________________
> balanced out conversion, I mean adding the inverting amplifier boosts the signal 2 times.
There's many ways to do this. Yes, an added inverter likes to add 2X/6dB. However it is not certain that an RCA output can drive one side of a balanced line. We often buffer, and can put gain (or loss) in that. OTOH you can use a 600:600 transformer for unity 0dB level, though not all RCA outs can drive that.
The +12dB RCA to XLR with a couple beefty opamps usually works good.
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What is the input sensitivty of your speakers?
+4dBu is 1.228Vac
What signal is required to just reach clipping?
What are the outputs of your Sources?
-10dBV is 0.316Vac
CD max 0dBfs is usually from 2Vac to 2.4Vac, but average levels can be 8dB to 20dB below that, i.e. from 200mVac to 950mVac.
Cellphones (and other small portable digital) could be a lot less. (you can measure this approximately with a DMM set to 2Vac)
If you need 15dB of gain from cellphone to speaker, then you have to add in a further +9dB stage.
It would be better for interference and noise to do this at the source.
+4dBu is 1.228Vac
What signal is required to just reach clipping?
What are the outputs of your Sources?
-10dBV is 0.316Vac
CD max 0dBfs is usually from 2Vac to 2.4Vac, but average levels can be 8dB to 20dB below that, i.e. from 200mVac to 950mVac.
Cellphones (and other small portable digital) could be a lot less. (you can measure this approximately with a DMM set to 2Vac)
If you add an inverted signal to your line level, you end up with double the voltage being fed to your balanced impedance cable, i.e. you have +6dB of gain by just adding the inverting stage.
If you need 15dB of gain from cellphone to speaker, then you have to add in a further +9dB stage.
It would be better for interference and noise to do this at the source.
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