1/4" Tip sleeve or Tip ring sleeve - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 12 Old 01-30-13, 09:03 PM Thread Starter
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1/4" Tip sleeve or Tip ring sleeve

The issue is I for some reason have a hum out of my newly built SI 15d4's and very little audible bass. However I do get vibration through the house.

If you are using the Mic2200 and EP4000, (or not) and have experinced the no bass issue and figured it out Please let me know.

On the front of the Mic2200 where it shows output db it is -34 to no more than-12 if i am really cranking receiver volume.

On the EP 4000, when I set up with receiver, as I turned gain up to around fifteen the receiver showed sub volume at 75db. With the 2200 and the 4000 on at first the 4000 clip light is on then goes off.
Then if I turn receiver volume up enough the signal light on #1 input blinks and #2 is on. The subs get louder but they are trash.

The drivers are wired in series and paralleled from amp in bridge mode.

Could I not have the dip switches in right position on amp?


Pease,Please help!

Thanks Mike

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post #2 of 12 Old 01-30-13, 09:26 PM Thread Starter
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Browsing the forum I came across this, could this be why I am having issues.


My second question is, on Amazon, one reviewer of crown said this "Crown accepts 1.4 volts input, which Onkyo 809 receiver was unable to provide. Onkyo could only pump out 0.2 volts, which is a shame. So, later I had to buy ART CleanBox Pro to bump up the output level of Onkyo 809. So, anyone interested in running this amp in HT setup must also buy ART CleanBox Pro, otherwise you won't be able to drive it adequately." Could you explain what this means? And also is it necessary to buy the pro or am I good to go? I appreciate any help you can provide Thanks DL

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post #3 of 12 Old 01-31-13, 07:07 AM
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The Crown amp needs 1.4 volts Going through the signal wire to be able to put out maximum wattage. Let's say the amplifier can put out 2500 watts into 4ohms. That is 100 volts. If it needs 1.4 volts to produce full wattage then the amp can amplify the signal by 71.5 times the input. (100/1.4=71.5). If your receiver only puts out .2 volts through its signal wires then the amp can only boost that by 71.5. That would be 14.3 volts maximum output. Into 4 ohms that is 51 watts. Not very much. You need something that will boost the signal from .2 volts to at least 1.4 volts. It can be more because the gain knob on the amp can be turned down to compensate. The item you mentioned will do that.


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post #4 of 12 Old 01-31-13, 07:24 AM Thread Starter
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Quote:
gottavtr wrote: View Post
The Crown amp needs 1.4 volts Going through the signal wire to be able to put out maximum wattage. Let's say the amplifier can put out 2500 watts into 4ohms. That is 100 volts. If it needs 1.4 volts to produce full wattage then the amp can amplify the signal by 71.5 times the input. (100/1.4=71.5). If your receiver only puts out .2 volts through its signal wires then the amp can only boost that by 71.5. That would be 14.3 volts maximum output. Into 4 ohms that is 51 watts. Not very much. You need something that will boost the signal from .2 volts to at least 1.4 volts. It can be more because the gain knob on the amp can be turned down to compensate. The item you mentioned will do that.
Thanks for that! I just realized that the low cut filter on the 4000 was on, therefore not pass anything below 50 hz.

Will the mic 2200 not boost the input voltage to amp from receiver? And how does one know what volts an amp needs to produce full wattage?

Kind of illiterate in all of this!

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post #5 of 12 Old 01-31-13, 08:44 AM
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Re: 1/4" Tip sleeve or Tip ring sleeve

Audiodreamer, you've got some reading to do.

http://www.behringer.com/assets/EP2000_P0A38_M_EN.pdf

Along with other information such as how to set the dip switches, the manual can tell you that the input sensitivity for the EP4000 is 1.23 volts(RMS) @ 8 ohms. Your Onkyo should be able to supply that without issue.
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post #6 of 12 Old 01-31-13, 12:27 PM Thread Starter
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dtsdig wrote: View Post
Audiodreamer, you've got some reading to do.

http://www.behringer.com/assets/EP2000_P0A38_M_EN.pdf

Along with other information such as how to set the dip switches, the manual can tell you that the input sensitivity for the EP4000 is 1.23 volts(RMS) @ 8 ohms. Your Onkyo should be able to supply that without issue.
You may be right. When I first read it did not register about the 50 hz cut off.
As far as the sensitivity of the amp I did read it did not mean anything to me. ( I did not understand ). This Onkyo came with manual on disk. I haven't even looked at it.

However on line it says something like 200 mv output.

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post #7 of 12 Old 01-31-13, 02:43 PM Thread Starter
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Re: 1/4" Tip sleeve or Tip ring sleeve

hello dtsdig! help me understand the differences.

Rated RCA Output Level and Impedance
200 mV/470 Ω (PRE OUT)
Maximum RCA Output Level and Impedance
4.6 V/470 Ω (PRE OUT)

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post #8 of 12 Old 01-31-13, 02:44 PM
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Re: 1/4" Tip sleeve or Tip ring sleeve

No, 200mv is the "Rated RCA Output Level and Impedance"
The next spec in the manual is:
"Maximum RCA Output Level and Impedance"
4.6 V/470 Ω (PRE OUT)

That will drive your EP4K just fine.
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post #9 of 12 Old 01-31-13, 03:30 PM Thread Starter
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So am I supposed to go off of the 4.6 v

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post #10 of 12 Old 01-31-13, 03:36 PM
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Re: 1/4" Tip sleeve or Tip ring sleeve

That spec is to say that the sub pre-out will put out a MAX of 4.6 volts.
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