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Author Topic: disable EV sb122 internal crossover  (Read 13295 times)

Sean Bugg

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disable EV sb122 internal crossover
« on: December 30, 2010, 03:14:47 pm »

Just like the title, I would like to by-pass/disable the hi-pass crossover in order to chain two sb122s together.
I feel that the crossover point is too high anyway. 160hz I think.
I would like to run one side of the amp to them and the other to the tops.

Thanks in advance for the help.
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Mike Pyle

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Re: disable EV sb122 internal crossover
« Reply #1 on: December 30, 2010, 04:02:40 pm »

Sean Bugg wrote on Thu, 30 December 2010 12:14

Just like the title, I would like to by-pass/disable the hi-pass crossover in order to chain two sb122s together.
I feel that the crossover point is too high anyway. 160hz I think.
I would like to run one side of the amp to them and the other to the tops.

Thanks in advance for the help.




There is no crossover, just a lowpass filter. The two NL4 connectors are paralelled.
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Mike Pyle
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Sean Bugg

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Re: disable EV sb122 internal crossover
« Reply #2 on: December 30, 2010, 04:11:35 pm »

Thanks Mike.

I am confused however. On the back plate it is labeled in and out. In the manual it says you can connect from the power amp to the sub (sb122 a sub that's funny) then to the tops because it will pass only above 140hz or 160hz.
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Bob Henley

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Re: disable EV sb122 internal crossover
« Reply #3 on: December 30, 2010, 07:04:11 pm »

Sean Bugg wrote on Thu, 30 December 2010 15:11

Thanks Mike.

I am confused however. On the back plate it is labeled in and out. In the manual it says you can connect from the power amp to the sub (sb122 a sub that's funny) then to the tops because it will pass only above 140hz or 160hz.


Ah, now I see what you're asking.

The NL4s are just in parallel: they pass the full range signal to the tops- there's no low highpass/lowcut when passing a signal through the Sb122.

While the Sb122 isn't the best sub, I like mine - they add a decent amount of low end to my Zx1s, I can carry one in each hand, and they're pretty cheap.
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Silas Pradetto

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Re: disable EV sb122 internal crossover
« Reply #4 on: December 30, 2010, 07:10:27 pm »

No one actually answered your question. Take out the input panel, remove whatever circuitry is there (probably just a coil to lowpass the woofer) and wire the speakons direct to the woofer. Should take you two minutes per.
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Sean Bugg

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Re: disable EV sb122 internal crossover
« Reply #5 on: December 30, 2010, 07:48:19 pm »

Bob  Healey wrote on Thu, 30 December 2010 18:04



Ah, now I see what you're asking.

The NL4s are just in parallel: they pass the full range signal to the tops- there's no low highpass/lowcut when passing a signal through the Sb122.

While the Sb122 isn't the best sub, I like mine - they add a decent amount of low end to my Zx1s, I can carry one in each hand, and they're pretty cheap.


This is what confuses me.  
http://www.electrovoice.com/sitefiles/downloads/SB122_EDS.pd f
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Mac Kerr

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Re: disable EV sb122 internal crossover
« Reply #6 on: December 30, 2010, 07:57:20 pm »

Sean Bugg wrote on Thu, 30 December 2010 19:48

Bob  Healey wrote on Thu, 30 December 2010 18:04



Ah, now I see what you're asking.

The NL4s are just in parallel: they pass the full range signal to the tops- there's no low highpass/lowcut when passing a signal through the Sb122.

While the Sb122 isn't the best sub, I like mine - they add a decent amount of low end to my Zx1s, I can carry one in each hand, and they're pretty cheap.


This is what confuses me.  
 http://www.electrovoice.com/sitefiles/downloads/SB122_EDS.pd f


What are you finding confusing? The NL4 connectors are in parallel and pass the full range signal. The sub as a built in low pass filter. Very simple.

Mac
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Sean Bugg

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Re: disable EV sb122 internal crossover
« Reply #7 on: December 30, 2010, 08:10:10 pm »

Mac Kerr wrote on Thu, 30 December 2010 18:57



What are you finding confusing? The NL4 connectors are in parallel and pass the full range signal. The sub as a built in low pass filter. Very simple.

Mac


This is from the link.


An integral low-pass filter allows the SB122 to be directly
connected in parallel with a full-range speaker for truly
impressive low-end output without the need for an
additional amplifier and processor. The filter is transparent
below 160Hz, allowing the SB122 to be used as an
independent subwoofer in biamp applications without the
need to disable the internal filter. For maximum output in
biamp applications and protection of the full-range system
when running in parallel, a 40Hz Hi-pass (subsonic) filter
is recommended
.
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Ivan Beaver

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Re: disable EV sb122 internal crossover
« Reply #8 on: December 30, 2010, 08:18:22 pm »

Sean Bugg wrote on Thu, 30 December 2010 20:10

Mac Kerr wrote on Thu, 30 December 2010 18:57



What are you finding confusing? The NL4 connectors are in parallel and pass the full range signal. The sub as a built in low pass filter. Very simple.

Mac


This is from the link.


An integral low-pass filter allows the SB122 to be directly
connected in parallel with a full-range speaker for truly
impressive low-end output without the need for an
additional amplifier and processor. The filter is transparent
below 160Hz, allowing the SB122 to be used as an
independent subwoofer in biamp applications without the
need to disable the internal filter. For maximum output in
biamp applications and protection of the full-range system
when running in parallel, a 40Hz Hi-pass (subsonic) filter
is recommended
.

As Mac said-what is confusing about that?

Maybe if you would point out what you find confusing-instead of us trying to read your mind-it might be a little be easier.
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For every complicated question-there is a simple- easy to understand WRONG answer.

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Gareth Marsh

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Re: disable EV sb122 internal crossover
« Reply #9 on: December 30, 2010, 08:18:27 pm »

Sean Bugg wrote on Fri, 31 December 2010 13:48

Bob  Healey wrote on Thu, 30 December 2010 18:04



Ah, now I see what you're asking.

The NL4s are just in parallel: they pass the full range signal to the tops- there's no low highpass/lowcut when passing a signal through the Sb122.

While the Sb122 isn't the best sub, I like mine - they add a decent amount of low end to my Zx1s, I can carry one in each hand, and they're pretty cheap.


This is what confuses me.  
 http://www.electrovoice.com/sitefiles/downloads/SB122_EDS.pd f



What that manual is describing is the 2 x NL4 connectors are literally connected directly (in parallel) to each other - the low pass is only after both the NL4 connections - effecting the driver in that sub box only.

The signal can go into either NL4 and out of the other (regardless of how they are labelled) and it will still be the full range signal that the amp is outputting along all the cable runs.

The reason they have done this is so that you can just run one signal out to both sub and mid-high cabinet. The low pass is just to stop the sub getting fed high frequencies, similar to the circuitry for woofers in most passive mid-high boxes.

For your application of linking 2 subs off of one amp channel, just run the NL4 from the amp into one and use another NL4 cable to link into the other. The low pass will only happen once for each sub, the signal between the subs will be full range.

If the 160Hz low pass is indeed to high for your application then you will need to look at using a DSP to filter the signal before the amplifier.


Hope this helps


Gareth
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Sean Bugg

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Re: disable EV sb122 internal crossover
« Reply #10 on: December 30, 2010, 08:19:23 pm »

 Embarassed
uh .... yeah.

Reading comprehension.  Embarassed

Here's MY sign.
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Paul Berg

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Re: disable EV sb122 internal crossover
« Reply #11 on: February 07, 2011, 01:48:58 am »

Hey. I recently purchased a VRX918sp sub to go with my current system of two EV SB122's and two EV ZX1-90's. I'm wondering if I can disable the internal low pass filter in order to use the SB122's as mid range speakers. I would get an active crossover and send mid range signal to the SB122's, high range to the ZX1-90's, and low range to the VRX918. Would mid range just sound like garbage on the SB122's? And if not, any tips on removing the low pass or just in general would be much appreciated. Thanks!
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Mike Pyle

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Re: disable EV sb122 internal crossover
« Reply #12 on: February 07, 2011, 11:00:17 am »

Paul Berg wrote on Sun, 06 February 2011 22:48

Hey. I recently purchased a VRX918sp sub to go with my current system of two EV SB122's and two EV ZX1-90's. I'm wondering if I can disable the internal low pass filter in order to use the SB122's as mid range speakers. I would get an active crossover and send mid range signal to the SB122's, high range to the ZX1-90's, and low range to the VRX918. Would mid range just sound like garbage on the SB122's? And if not, any tips on removing the low pass or just in general would be much appreciated. Thanks!



Midrange from the SB122 would sound bad. I will say that even with the lack of proper crossover the ZX1 and SB122 make a good sounding fullrange combination. If you were to bypass the filter in the SB122 and use an active crossover in the 150ish Hz range, you might get very nice performance with a little experimentation. Adding a highpass to the ZX1 would ceratinly give it more capability as a mid/high box.
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Mike Pyle
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Paul Berg

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Re: disable EV sb122 internal crossover
« Reply #13 on: February 07, 2011, 12:05:03 pm »

Thanks for the input! Just curious, how much trouble would it be to bypass that filter, and would it be difficult to engage it again in case we decided that it isn't doing what we need?
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Eric Wong!

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Re: disable EV sb122 internal crossover
« Reply #14 on: February 10, 2011, 03:48:47 pm »

I have these "subs" and have done this mod. I always run an active crossover so didn't like the idea of the gigantic inductor introducing phase shift and soaking up some power.

It's very easy. Just get some appropriate wire, crimp on the appropriate sized female faston terminals (I *think* they are .205 and .25") and wire them up. Took less than an hour including disassembly.
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Paul Berg

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Re: disable EV sb122 internal crossover
« Reply #15 on: February 10, 2011, 03:58:16 pm »

Awesome! Thank you for the help. That pretty much just answered my question.
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