Low level to High level? - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 17 Old 07-20-16, 11:45 AM Thread Starter
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Low level to High level?

I picked up a cheap old Mirage sub on craigslist for $40 until I have time to build my own, but I don't know how to hook it up to my system. I have a subwoofer cable running to my living room and no way to run any other cables since they are all about 50' runs from another room where my receiver is hidden. The sub has a right and left low level inputs which do not respond when I put my sub cable into them. There are also high level right and left inputs and low level right and left outputs. Is there any way I can do this with some kind of adapter from my sub cable to a high level input?
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post #2 of 17 Old 07-20-16, 02:36 PM
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Re: Low level to High level?


High-level inputs come from an amplifier’s speaker outputs. The only way to utilize a line-level signal into a high level input is to feed it to an amplifier first. Assuming your subwoofer cable is the type with RCA plugs on each end, you’d have to figure out a way to connect a speaker wire to the end near the amplifier.

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post #3 of 17 Old 07-20-16, 02:38 PM
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Re: Low level to High level?

What type of "sub cable" are you referring to? For the most part people hook up their subwoofers using an RCA cable into the low level connections, but from what you're saying it almost sounds like the Mirage doesn't have those inputs. Can you post a picture of the cable and amplifier on the sub?

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post #4 of 17 Old 07-20-16, 05:22 PM Thread Starter
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Re: Low level to High level?

I am running an rca from my "sub out" on the receiver. I have never seen a sub with this set of inputs though and cannot figure out how to get sound out of it. The guy I bought it from said that he just had his left and right front speaker wires in the high level inputs.
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post #5 of 17 Old 07-20-16, 06:27 PM
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Re: Low level to High level?

Quote:
clint357 wrote: View Post
I am running an rca from my "sub out" on the receiver. I have never seen a sub with this set of inputs though and cannot figure out how to get sound out of it. The guy I bought it from said that he just had his left and right front speaker wires in the high level inputs.
You should be able to simply plug in the subwoofer RCA cable you have using either the left or right (low leve) input jacks.

I hesitate to ask:
1. Is it plugged in?
2. Are you certain that your subwoofer output is active?

Kal Rubinson
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post #6 of 17 Old 07-20-16, 07:13 PM
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Re: Low level to High level?

I'm with Kal; either of those low level inputs should suffice. Is it possible the cable run is damaged?

-Jim

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post #7 of 17 Old 07-20-16, 07:19 PM Thread Starter
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Re: Low level to High level?

I unplugged another sub (which worked fine) and plugged this one in...
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post #8 of 17 Old 07-20-16, 07:25 PM
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Re: Low level to High level?

And? What's the other half of that sentence?

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post #9 of 17 Old 07-20-16, 07:34 PM Thread Starter
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Re: Low level to High level?

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theJman wrote: View Post
And? What's the other half of that sentence?
Nothing happened, so I posted on this forum for some expert advice. I'm wondering if the Low Level Input is defective. I just took the amp out and looked for obvious signs to cause malfunction such as a blown fuse or a broken connection, but saw nothing. I plugged into the high level input with a modified headphone jack out of my phone and got sound out of it (very quiet of course), but still shows me that the high level does in-fact work. I will probably just end up getting rid of it, but I'm really curious to hear how it sounds and play with it.
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post #10 of 17 Old 07-20-16, 08:27 PM
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Re: Low level to High level?

That's curious. In subs like this, the high level output feeds the same amp as the low level input but through a filter/attenuator. This suggest that a physical connection between the low level inputs and the amp interrupted.

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