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custom crossover for 2 way


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sq_impala 
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Member spacespace
Joined: August 14, 2007
Location: United States
Posted: August 14, 2007 at 8:47 AM / IP Logged  

Hello,

I have a pair of Mpyre 65m XBL^2 drivers. (Very similar to Adire extremis)   The tweeters I have to use are Focal TN-51's.  

I have tried to factory MPyre crossover, and the tweeter was way too loud, and the x/o lacked atten.   So I tried the Elemental Designs x/o from the 6000s, and the same problem (only sligfht attenuation -3 db).

Can I put an L-pad inline with the Mpyre x/o?  If not can someone show me what I need to do to build my own crossover to make them sound awesome, or should I pick up an AudioControl DQX (Already have DQT though)

Also any recc's on the firing of them?  On/off axis?   They will be in custom  fiberglass kick panels made by me.

DYohn 
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Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: April 22, 2003
Location: Arizona, United States
Posted: August 14, 2007 at 10:40 AM / IP Logged  
The Mpyre drivers do look nice.  A problem you may have using them with that tweeter, however, is Focal recommends a 24db/oct crossover @ 3KHz, which is pushing the Mpyre into the area where it gets pretty ragged sounding.  Plus, the Focal tweets are 94 db sensitive and the woofers are 88.8, which means you need to pad the tweet at least 5to 6 db before they even match the woofer, and then they are titanium domes so they will always sound really bright.  If those tweets sound too bright to you, I suggest changing to a fabric dome.  If you want to add an L-pad to adjust tweeter sensitivity it goes in the tweeter crossover, not in line with the woofer crossover.
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sq_impala 
Member - Posts: 8
Member spacespace
Joined: August 14, 2007
Location: United States
Posted: August 14, 2007 at 10:58 AM / IP Logged  
The Mpyre crossover has a tweeter out, they never receieved their 10T silk tweeter to go along with it, so I purchased the set without the tweeter.   Kyle from A/V told me it was a 3.5 khz at 24 db/oct.   The Mpyre's sound pretty good up high without any tweeter attached now.....so I think they should be able to handle up to 3.5 khz.   Can I L pad the tweeter out  of the mpyre crossover, if so whats a high quality lpad to buy?    If not, who wants to make me a nice custom crossover?
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: August 14, 2007 at 11:23 AM / IP Logged  
What is the impedance of the Focal tweeters you have?  What is the impedance of the tweeters Mpyre designed their crossover for?
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sq_impala 
Member - Posts: 8
Member spacespace
Joined: August 14, 2007
Location: United States
Posted: August 14, 2007 at 10:55 PM / IP Logged  

I can't find definate numbers on either anymore, however, when I started this project earlier in the summer I saw it, and I believe they were both approx. 4 ohms,  one may have been 3.4 ohm,   is that close enough?

DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: August 15, 2007 at 8:15 AM / IP Logged  

sq_impala wrote:
I can't find definate numbers on either anymore, however, when I started this project earlier in the summer I saw it, and I believe they were both approx. 4 ohms,  one may have been 3.4 ohm,   is that close enough?

Yes, that's close enough so that the crossover should be functioning at the same frequency.  So now we're back to the Focal needing to be damped at least 5db and the fact that metal domes are just naturally very bright sounding - which, by the way, is one reason why I have always disliked the sound of Focal systems.  So get a 4-ohm L-pad and give it a try.  Connect it between the tweeter output from the crossover and the tweeter.

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sq_impala 
Member - Posts: 8
Member spacespace
Joined: August 14, 2007
Location: United States
Posted: August 17, 2007 at 2:09 PM / IP Logged  

I've searched through parts xpress and a few other sites and done some searching, and have not been able to find a 4 ohm L pad.   I found an 8 ohm pro audio one on ebay.....that won't do me anygood though.    Any ideas where to get one?

DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: August 17, 2007 at 2:47 PM / IP Logged  
You can use a stereo 8-ohm L-pad and wire both pots in parallel for 4-ohms.  This one would work.
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sq_impala 
Member - Posts: 8
Member spacespace
Joined: August 14, 2007
Location: United States
Posted: August 17, 2007 at 10:29 PM / IP Logged  

Do I need two, or just one?   How should it be wired (more in depth than parallel, like soldered, where to, etc...)  Is there an instruction manual?

How should I fiire the speakers, on.off axis?

DYohn 
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Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: April 22, 2003
Location: Arizona, United States
Posted: August 18, 2007 at 12:01 AM / IP Logged  

You need one of the stereo L-pads for right and one for left.  No, there will probably not be an instruction manual.  You should aim your speakers on-axis to the primary listening location if you can.  Here's how to wire the L-pads:

Each pad will have three terminals.  (A stereo l-pad is actually two pads connected to the same shaft.)  Connect the furthest left and right terminals on both pads in one stereo set to the tweeter output of the crossover, negative to one side and positive to the other side.  Continue the negative wire to the tweeter.  Connect the positive wire from the tweeter to both center tap terminals on the L-pads.  Now you can use the L-pad to adjust the volume going to the tweeter.  If you don't understand this, you may want to get some help from an installer in your area.

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