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Discussion Starter #1
I have 2 parts express kits with Dayton 18-22. Both are powered each by an inuke 3000 bridged. My room is about 16w 23d with 8 ft ceilings. I was recently at a bestbuy magnolia design center here in Kansas city and listened to a martin login single 15 (high end model) in their demo room. The demi room appeared to be about the size of my theater room. My question is, the ml sub had so much more impact (feel or room pressurization, if you will). I know my Dayton's are running a 4 ohn signal to my amps bridged. Just wasn't sure if anybody else has the same issue. The output of the daytons is great. 100db plus at listening position. It just blew me about at the impact of the ml single 15.
Maybe I just need 2 more 18s in my room. Any ideas?
 

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This is a case for REW. I'm guessing you have some nulls at the LP. Mikmaz is right. 2, 18's should kill the 15. 2 more 18's should probably be installed as well, just to be sure...


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Discussion Starter #4
No eq...I thought about getting a mini DSP but decided to hold off because I'm setting up atmos and getting a marantz 7010 or 7702 or 8802a.

I also need a mic so no rew measurements.

Don't get me wrong...the sub's are plenty loud. Just no hard slam in your chest like I noticed at bestbuy. Doesn't seem like they pressurize the room.

I sure I will get 2 more because of room size and I want 4 of them.
 

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I think 4subs would be great. REW will still help you get the most out of them.


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I need to get a mic I just keep putting it off. I was amazed when I built the 1st 2. Maybe the room is a lot smaller than I realize or my room is a lot bigger. I will work on ordering a mic and take some measurements with few.

Also there is no room treatment of any kind yet. Another project for another thread.
 

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I would say the room could be deceivingly large. However, sub location, phase, and LP location are more significant factors in a "normal"(like yours) sized room. All it takes is one null to suck the life out. One thing a lot of people talk about is how multiple subs even out response. The truth is, they have the potential to do that, but they still have to be integrated properly. I'm not saying that's the case here, just that with multiple subs it's more important to make sure, and there are no guarantees whatsoever.


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Discussion Starter #9
Well I spent hours doing the sub crawl. I ended up moving both sub's to the front corners and It is a lot better. Guess maybe it is just my room. I ordered a umik1. Will let everybody know when it arrives
 

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Nice. Actually the truth is, it's always the room. I think you're going to be surprised once you you start making sweeps with REW. It's an invaluable tool for seeing what's going on in the room. Then you'll know why to adjust what, like phase and crossover points, etc. You can do some testing with an spl meter, but it's not quite the same.


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Discussion Starter #14
I thought the DSP was a must on ported sub's but not on sealed. Correct me if I am wrong. I did a lot of research off this site when I built them.
 

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I thought the DSP was a must on ported sub's but not on sealed. Correct me if I am wrong. I did a lot of research off this site when I built them.
You need it on both. If you're starting from scratch, a sealed build will have a rolloff down low that you will have to counter with the DSP. Likewise on the ported, you may have better response down low, but once you get below the tuning frequency you're going to have to use the DSP to purposely roll it off to prevent driver damage. Plus, outside of hoping that Audessey fixes stuff for you, there's really no other way to fix room mode issues. There's really no sub that doesn't need a DSP. Can you listen to stuff without one? Sure you can.
 

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Discussion Starter #16
Thanks for the info. I ordered a mini DSP.

I got confused. I assumed the box acted as a high pass filter. It can't hurt anyway.
 
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