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Post by cleftin on Aug 19, 2017 14:21:52 GMT -5
I have an Emotiva PT-100 going into powered JBL LSR305.
The LSR305s have a switch on the back which allows a change between +4dBu or -10dBV. Which one of these would the emotiva support? Its my understanding that +4dBu is for pro equipment, and -10dBV is for consumer equipment. I have been running them at -10dBV for months and obviously there are no problems, but could there be a benefit to running them at +4dBu. Very curious about the difference between the two if anyone has any insight.
Thanks
Caleb
I also have a question about the phono stage remaining completely analog through the entire machine. It has digital volume control and digital trim, so my instinct is no. If anyone has any insight about that I would be very interested to know as well. Thanks again.
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Post by leonski on Aug 19, 2017 18:35:33 GMT -5
Where's your VolControl at when listening at yuur preferred level?
If it's anywhere between 10 and 2 (o'clock) I'd leave it alone
I don't see the harm in trying +4 but keep the level WAY down until you see how much louder (14db is a LOT) it ends up.
Since the speakers are Balanced =XLR or TRS connector, I must ask if the PT-100 has balanced outs and if NOT, how you make
the connection?
Have you adjusted either 'trim' control and where is the 'level' set at, on the speakers, that is?
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Post by MusicHead on Aug 19, 2017 19:39:56 GMT -5
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Post by Gary Cook on Aug 19, 2017 21:33:31 GMT -5
I also have a question about the phono stage remaining completely analog through the entire machine. It has digital volume control and digital trim, so my instinct is no. If anyone has any insight about that I would be very interested to know as well. Thanks again. Commonly Emotiva use a digitally controlled resister ladder for the volume, this means that although the volume controller is digital the actual volume is controlled by which resistor/s are selected in the ladder i.e.; analogue volume. Cheers Gary |
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Post by Axis on Aug 19, 2017 21:59:41 GMT -5
I have an Emotiva PT-100 going into powered JBL LSR305. The LSR305s have a switch on the back which allows a change between +4dBu or -10dBV. Which one of these would the emotiva support? Its my understanding that +4dBu is for pro equipment, and -10dBV is for consumer equipment. I have been running them at -10dBV for months and obviously there are no problems, but could there be a benefit to running them at +4dBu. Very curious about the difference between the two if anyone has any insight. Thanks Caleb I also have a question about the phono stage remaining completely analog through the entire machine. It has digital volume control and digital trim, so my instinct is no. If anyone has any insight about that I would be very interested to know as well. Thanks again. How does it sound ? |
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Post by leonski on Aug 19, 2017 22:16:28 GMT -5
No Linkee
But poked around and found it.
By digitally controlled resistor ladder do you mean:?
A resistor ladder attenuator with an encoder disc / to some kind of digital readout? In that case the level control should work even
IF you went in and simply cut the wires to the level display.
My '70s vintage Kenwood Integrated (KA-7100) had such a level control. Of course, today, I'd expect them to be somewhat better
and better match between channels when using 1% or better film resistors which are an inexpensive commodity part.
No electronic readout, however, just a knob / marks.
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Post by Cory Cooper on Aug 19, 2017 23:46:40 GMT -5
Hello,
Since the PT-100 has unbalanced RCA outputs, and the JBL LSR305 has a balanced XLR or TRS input, you really should use some kind of direct box to convert the unbalanced -10dBV output from the PT-100 to the proper balanced +4dBu input on the LSR305. There are several brands like Ebtech, Radial, Whirlwind, ART, Behringer, etc. If you don't correctly match the output to input, you can get distortion, level mismatch, and even introduce ground loop issues.
Ooops - forgot to add - if you are running an RCA to unbalanced TS 1/4" cable, the -10dBV setting would be correct.
C
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Post by Axis on Aug 20, 2017 0:17:42 GMT -5
I would not worry about converting SE to balanced. My Emotiva DC-1 DAC will convert digital or analog single end input to balanced output but I do not hear any difference.
I use the balanced output from my DC-1 DAC to my Airmotiv 5s monitors with XLR cables for a solid connection and to give me the RCA outputs for other reasons but there is not a leap in sound quality. This notion that balanced is a leap in performance is a myth.
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Post by leonski on Aug 20, 2017 19:12:56 GMT -5
Problem is the JBL speakers are ONLY balanced in using TRS or XLR.
PT-100 is single ended out ONLY.
balanced comes into its own with longer runs.
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Post by vcautokid on Aug 20, 2017 21:30:10 GMT -5
Like Leonski says. I would use the RCA -10dB connection, and not worry about it. Unless you really are running long cable lengths where balanced +4dB come into their own. I have these speakers. I use them in another small editing station. I use the RCA connections without another thought. It works, and sounds fine. If it were me, I would just run RCA -10dB unbalanced and enjoy it.
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Post by oldschoolpolk on Aug 31, 2017 20:25:16 GMT -5
I've had the PT-100 for 5 months hooked up to JBL's LSR 308s at +4db and have had no problems. I got on Sweetwater and bought inexpensive 20' RCA -> TRS cables.
My room is 22x18 and is comfortably loud at 75 on the volume setting. Honestly, its stomping good.
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