Center channel Dimensions help? - AVS Forum
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post #1 of 19 Old 06-25-2012, 10:29 PM - Thread Starter
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I am making a center channel with the following speakers: 2xTHIS and 2xTHIS , and I need dimensions, I'm pretty sure I'm gonna have to go with ported, which is fine, but I do have limited space, It cannot be more than 15" tall, 28" wide, and 25" deep, because that is the space I have left for my centre channel, can anyone give me a basic idea for external dimensions?

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post #2 of 19 Old 06-25-2012, 10:43 PM
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Do you have a plan for a crossover?

https://sites.google.com/site/undefinition/diy-faqs-provendesigns
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post #3 of 19 Old 06-25-2012, 10:50 PM - Thread Starter
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Quote:
Originally Posted by Jay1 View Post

Do you have a plan for a crossover?
https://sites.google.com/site/undefinition/diy-faqs-provendesigns

Well, I'm not sure if i need one, I'm using THIS receiver, which I thought would have some sort of crossover built in? But I don't really understand crossovers very much.

Don't crossovers it tell which speaker to use based on the frequency? So the tweeter doesn't try 500hz?

EDIT: Im going to be hooking up the left woofer to the left channel, right woofer to the right channel, and Im going to wire the tweeters in a series to the center channel.
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post #4 of 19 Old 06-25-2012, 10:54 PM
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That receiver will crossover the speakers, and the subwoofer, typically at 80hz. It will not do anything to control the individual drivers in a speaker. There are numerous proven designs out there, many well under your size requirements. What is your budget?
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post #5 of 19 Old 06-25-2012, 10:57 PM - Thread Starter
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Well I have already ordered those speakers and receiver, now all i need is the MDF/Glue/screws n such. And now a crossover.
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post #6 of 19 Old 06-25-2012, 11:00 PM
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Can you send them back? You're not going to have success with your proposed design. Read the link in post #2
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post #7 of 19 Old 06-25-2012, 11:07 PM - Thread Starter
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Send what back? All of it? I did, and I'm still confused.
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post #8 of 19 Old 06-25-2012, 11:09 PM
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Quote:
Originally Posted by Ronoman View Post

Well I have already ordered those speakers and receiver, now all i need is the MDF/Glue/screws n such. And now a crossover.

Can you send the speaker components back and start over with a new plan?
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post #9 of 19 Old 06-25-2012, 11:11 PM - Thread Starter
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I probably could what do you recommend as a new plan? I'd really like to not spend any more money, I just want maximum output/quality for the price of those 4 speakers I guess.

EDIT: less than $100 on the speakers would be perfect.
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post #10 of 19 Old 06-25-2012, 11:25 PM
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Your budget doesnt exactly match your goals, but there are some good speakers out there

http://www.diysoundgroup.com/speaker-kits/osmtm-flat-pack.html (might not be loud enough for you, but designer says he pushed to 99db without issue)

http://www.madisoundspeakerstore.com/mtm-speaker-kits/zaph|audio-za5.3c-center-channel-single/

http://www.madisoundspeakerstore.com/mtm-speaker-kits/curts-sten-ii-mtm-speaker-kit-pair/ (loudest kit here)

http://speakerdesignworks.com/Dayton_MTM_CC_FIN.html
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post #11 of 19 Old 06-25-2012, 11:32 PM - Thread Starter
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I like the looks of the second link, but it looks like what I ordered, just with a crossover, couldn't I just add a crossover to my speakers that are coming?
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post #12 of 19 Old 06-25-2012, 11:35 PM
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A crossover is 100% specific to the exact drivers being used. These kits are all designed with a series of measurements, and modeling of the drivers responses, together with the designed crossover. In short, no.

Design write up for the Zaph kit

http://www.zaphaudio.com/ZA5/
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post #13 of 19 Old 06-25-2012, 11:40 PM - Thread Starter
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So something like THIS would just be a waste of money? Because I really don't want to send back what I've ordered, I have basic soldering knowledge, couldn't I create my own crossover?
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post #14 of 19 Old 06-25-2012, 11:45 PM
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Yes, that would be a waste. Do what you like this is DIY, but that's a lot of time and effort to build a box...
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post #15 of 19 Old 06-25-2012, 11:49 PM - Thread Starter
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I understand its a lot of work, but that's the fun of it! I can say "I spent 3 months making that, and it sounds awesome!!" Once I figure out some exterior dimensions the box building will be easy, I'm just not sure where to start for a custom crossover
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post #16 of 19 Old 06-26-2012, 07:19 AM
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You really need to read the link in post #2. Here's another link to read as well

https://sites.google.com/site/undefinition/diy-mfaq
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post #17 of 19 Old 06-26-2012, 07:29 AM
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Quote:
Originally Posted by Ronoman View Post

I understand its a lot of work, but that's the fun of it! I can say "I spent 3 months making that, and it sounds awesome!!" Once I figure out some exterior dimensions the box building will be easy, I'm just not sure where to start for a custom crossover


Just wanted to make sure you didn't think Jay1 was picking on you and echo his responses so far. It may seem harsh but Jay1 is just trying to help your project become a success. I know he already linked this and suggested a second time that your read it but please please read this link. It contains everything that we would reply to the quote above plus the entire conversation that would ensue:

https://sites.google.com/site/undefinition/diy-faqs-provendesigns

You mentioned you don't want to waste money and we don't want you to either smile.gif Your plans and suggestions to this point would guarantee failure unfortunately (and result in more money wasted redface.gif)
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post #18 of 19 Old 06-27-2012, 09:38 AM
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Quote:
Originally Posted by Ronoman View Post

So something like THIS would just be a waste of money? ...

+1 to everything Jay's said. He's telling you about reality.

This question lies at the root of your misunderstanding. Follow the link you posted for the PK165-8, then click on the spec sheet on the right. A PDF opens with data on the left and two charts on the right.

This crossover assumes those charts only contain horizontal lines, i.e. that speaker impedence does not vary with frequency, and neither does it's output level. As you can see, there are complex function on each chart, so the assumption is false. The crossover you want is one specifically customized for the FR and impedence response of the drivers used. DIYers can do that, but it takes time to learn and money for test equipment that you may not use again.

Build a proven design. That Denon looks like a good AVR, but AVRs only do bass management.

Have fun,
Frank
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post #19 of 19 Old 06-27-2012, 11:45 AM
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Hey,

I also wanted to come up with my own design when i first started building DIY stuff. If you spend 5 minutes reading up on crossover design and some other related topics, you will have a clearer understanding why people on this forum will push you towards a proven design. I'm glad i've taken that route.

I built the Zaph center channel about a year ago. I use it in my main TV room and It sounds pretty good. It's a good value and comes with everything you need including an assembled crossover as i recall. Probably the easiest thing to get started in DIY with.

Recently i built the Tritrix kit. I haven't done direct side-by-side comparison but my impression is that the Tritrix sounds better than the Zaph 5.3... the vocals sound more natural to me and the design will tolerate laying it on its side to use as a center channel. You can order a Tritrix kit (comes as a Transmission Line kit) from Parts-Express and then build the Sealed or Ported variant (i built the Ported). The kit comes with components for 2 speakers and you only need one, but even still, it's only about $140. Good to have extra drivers for when your drill slips and you drill a hole through a surround. With this kit you need to assemble the crossover yourself - so you need to be able to solder and lay out some wires. You will also need to pick up some PVC pipe and foam padding if you go with the vented design.

To order the kit:
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=300-700

To see specs on the different build variations (transmission line, sealed, ported) :
http://speakerdesignworks.com/Tritrix_pg_1.html


I think the Triune design (http://speakerdesignworks.com/Dayton_MTM_CC_FIN.html) linked to earlier in the thread is 4ohm, while the Tritrix is 8ohm, so i think you get more sensitivity out of the Triune as long as your receiver can handle it. But i haven't built the Triune so i can't comment on how it sounds.

Good luck.
Joe
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