hum dinger wrote:
So how much can you mess with the dimensions/ port size etc? I asume diamond has played with the #'s to get their sub to be the best they can get. Can I just change port size to tune it to whatever Hz I want. I relize this will change the cubic foot of the box because the port will take up more or less displacement. If I do tune it lower does the box displacement overall have to change. I noticed yours is smaller at .75. I thought the bigger the box the lower it would play? There must be a reson they didn't tune it lower themselves, can the sub just not handle that low of freq?
You mentioned that with your design the port would be 75" long. When I was messing with the port calcuators I notice the smaller you make the diameter the shorter the port would be. Were you using a 4" diameter port? If you were and went to a 2" diameter port it seems to cut the lenght in half. Is this correct? Is there a reason you don't want to go with a smaller than 4" port in general? Same thing with a slot port. The one they show on Diamonds site has a rediculous length. Why not just make the slot 4"X1" and the port should be closer to 10" long? There must be a reason, every slot port box I see has a big ass 4"X12" opening . Acording to the calcuator you could just make the opening smaller and not eat up so much box space.
Sorry I ramble on and mix in 10 questions. |
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Like the post above said, you don't want to make the port too small or you will have port noise. The hard part is finding a port size that does not have port noise but also is not too long. The bigger the port the less port noise you will have. However, your port will be much longer.
I would not use anything smaller then a 4" port. You
may be able to get by with a 3" aeroport but then again you may have some port noise.
Manufacturer's recommended enclosure is not always ideal. They factor in many things when they make their recommended enclosure. Why I think Diamond made the design they did was because of two main factors. The first is that many people will like the sound that enclosure makes. It is going to give you good output, although not too much sound quality. If that is what you want then that design will work for you. Like I said before, I prefer more sound quality then loudness so I made my own design.
The second reason I believe they made the design they did was because of the difficulty of the design. Diamond wanted to make the smallest overall enclosure and one that is easy to build. That is why they have a 1.25 cubic foot enclosure that has a relatively small port. My design is rather large and difficult to build. It is not something many people are going to want to build or have room to build.
I used a slot port design which is why it is so long. I made it to not have port noise. Since the volume is so small the port is extremely long as well.
The reason I chose 0.75 cubic foot was due to it's better sound quality then a larger enclosure. I don't have any problem with not having low end bass because it has usable bass all the way down to around 20Hz. Plenty deep enough with that low tuning. If you made the enclosure bigger you would get more output at the lower frequencies but not as good sound quality.
If you use a 2" port instead of a 4" port the port will not be half the size. It would be much shorter then half the length. You would use the calculator to figure out how long exactly. Like said before you would have port noise if you did you a 2" port however.
Diamond has a slot port design on their website as well. It may be worth a look over. The same specs as the round port in the manual but uses a slot port instead.
http://www.diamondaudio.com/PDF/current/WiringEnclosures/Single12VentedEnclosure.pdf
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