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Multi-Way Conventional loudspeakers with crossovers

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Old 1st November 2004, 09:50 PM   #1
jchappj is offline jchappj  United States
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Default Tweeter Opinion

Hi Everyone. A quick intro and a question for you. I am a relative newbie to speaker building. I have completed a bass guitar cabinet using a single JBL 2245H that turned out pretty good. This in turn has given me a pretty big itch to complete a project a little more adventurous. I've got a decent wood shop so I'm combining two of my favorite interests, music & woodworking. This forum seems like a great resource! OK, at any rate here's the deal:
Latest project- build (5) two-way speakers for hometheater surrounds. Woofers will be the Focal 6W4311, already purchased. Boxes 3/4" MDF and vented. BBPro used to get the optimal Vb. My choice for the tweeter is either the Morel MDT-20 or MDT-30. I was hoping to get opinions on which to use (excepting the obvious cost difference). OR, even opinions on an altogether different one. Any other tips greatly appreciated too!
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jchappj
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Old 2nd November 2004, 02:55 AM   #2
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Default tweeter advice

could use a little information,
1). do you plan on making these for just surrounds or all five of a
five channel system
2).are the focals shielded
3).what are you planning for your cross over point
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Old 2nd November 2004, 02:58 AM   #3
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Links for the specs to your proposed tweeters would be good too... save the ppl browsing the forums from looking for them... hence, allowing them to give a speedy answer
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Old 2nd November 2004, 10:27 AM   #4
jchappj is offline jchappj  United States
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Default Re: tweeter advice

Quote:

1). do you plan on making these for just surrounds or all five of a
five channel system
2).are the focals shielded
3).what are you planning for your cross over point
1). They will be the surrounds for a 6.1 system. I'm using a pair of Polk Monitor 5's for the Center.
2). They're unshielded. Here's the MDT-30, and here's the MDT-20. Here's the Focal spec's.
3). The crossover is my next step, I haven't gotten that far yet. The woofer range is 50 Htz-4500kHtz. The tweeters are 1300 and 1600 - 20,000kHtz. I'm using a subwoofer on the system, 150 Htz crossover point for the really deep bass.
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Old 4th November 2004, 01:23 AM   #5
jchappj is offline jchappj  United States
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Well, I received the Focals today from Zalytron. Also got the sides/tops/bottoms glued up on three of the five boxes (limited by number of clamps and that precious commodity-time). Forging (blundering?) ahead and still hoping someone has an opinion one way or another.
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Old 4th November 2004, 01:23 AM   #6
jchappj is offline jchappj  United States
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Here's a shot of the cabinet I mentioned BTW... It also has a grill that goes on front. I think it sounds pretty good when I'm gigging. I use a Hartke amplifier and bi-amp the lows to it, the the highs to a David Eden cabinet.
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Old 4th November 2004, 02:28 AM   #7
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I used the similar Focal 6w4252 in this speaker Link. The woofer has a slightly bigger peak at 4500 Hz. Crossed over 4th order LR at 2400 Hz I still felt like I needed a notch filter to smooth it out. Keep that in mind if you try it without a notch at first. Crossing over lower will probably eliminate the need for the notch.

I don't have any experience with the Morels so I won't comment there. I am very happy with the Focal T120DX5 I used. They are more expensive than the Morel's though. At any rate, the 6W4311 should do quite well up to at least 2500 Hz, giving you flexibility in choosing a crossover point. As surrounds these speakers might convince you to upgrade your mains.

I like the sound of my bass played through a 2245H, too. It's my music system subwoofer driven by a bridged Hafler DH-500, so I don't do it often. The first time I was enjoying it so much that my then 15 year old, loud hip hop loving daughter reminded me that "We have neighbors, you know."
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Old 7th November 2004, 09:06 AM   #8
jchappj is offline jchappj  United States
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Using X-Over Pro I came up with the attached graph for my proposed crossover network. I got the theoretical values from the program then replaced them with values that are close but easily purchasable. I would appreciate opinions as it looks pretty good to me but being new to this I'm not sure. Is there any way to smooth out that ~3dB drop? Thank you. I ended up with Morel MDT-37's BTW...
jchappj
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Old 7th November 2004, 09:06 AM   #9
jchappj is offline jchappj  United States
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Here is the design...
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Old 18th November 2004, 10:26 PM   #10
jchappj is offline jchappj  United States
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Hmmm... Well, OK. Can anyone tell me how critical it is to mount the inductors perpendicular to each other? If anyone has experience in this thanks for your reply.
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