My sub response curve... Now what speakers?

[rolyasm]

Hello again,
I just finished building my subwoofer and am ready for speakers. Here is my dilemma. My sub will go very low, probaly 10hz with some great output, but I have been told that it might have a problem going high. My original speaker choice was the M&K s-150s that have a lower frequency range of 80Hz. They are THX, movie speakers. This is for a dedicated HT, no music. So, is there any way to tell for certain how high my sub can be crossed by looking at its response curve? I just hate to buy 2 fronts and then I have a big frequency gap between my subwoofers response and that of my mains. Here is my first EQ'd response with the Behringer Feedback Destroyer. I know it needs some work, but this is the actual first measurement. http://www.htguide.com/forum/attachment.php4?attachmentid=7038
If it won't work, it won't work.
Another option is a full range speaker. I like the energy C-series, but haven't heard the new RC series. Frequency response of 31Hz-24Khz. Would this be enough of a full-range speaker to set the mains as "large" and just run LFE to my subs, or do I really need a 20-20Khz range speaker to do this?
Lastly, what would I happen if I got the M&K's and there was a problem crossing at 80Hz, so I crossed them at 40Hz, and go another mid-range woofer that had higher extension and crossed it at 80hz? Would that just get very complicated?
Thanks everyone,
Roly

 

[gmichael]

You should be OK. Although your speakers are only rated down to 80 (-3db) they should still have some response below that. And your sub has a response above 80 even though it's not at the same level (about -5 db from your graph). There should be enough overlap to fill the gap you were expecting.

 

[rolyasm]

Gmicheal,
Out of curiousity, what would be my subs rated frequency, on the high range? Do I look at where it drops from the 80dB level?
Roly

 

[gmichael]

Gmicheal,
Out of curiousity, what would be my subs rated frequency, on the high range? Do I look at where it drops from the 80dB level?
Roly

There is more than one way to rate it. Some rate them + or - 3db. Some use + or - 6 db. Some actually use -10db. Most good manufacturers use +/- 3db though. It must be a monster. What is it, 18"?

 

[rolyasm]

No, it is actually 4 15" drivers built into the front of my riser.
So how would you rate it at +/- 3 dB?

 

[gmichael]

No, it is actually 4 15" drivers built into the front of my riser.
So how would you rate it at +/- 3 dB?

From gut ripping to 70 +/-3db.

Don't forget to put in hand rails.

 

[Nick250]

Rolyasm, if it were me, I would feel more comfortable with main speakers that were 50Hz +- 1 db. I would want a bit more of an overlap with the M&Ks and the subs. There are plenty of good speakers to pick from that can do this. Any, that's my take on it.

Nick

 

[billnchristy]

Have you bolted down the fine china?

 

[rolyasm]

We can't afford china, put the plastic plates sure do clank together. Last night I took my wife into the HT for the first time to listen to the subs. All I have is the sub, no mains. So I put on ACDC, who made who, and turned up the volume a little. We listened for a bit then went upstairs. My wife said she felt a little sick! hehe. Success. She actually told me she liked it and was imagining our favorite deep-bass movies. I can't wait to find all the rattles in my room. The sconces may have been a bad idea. They are very noisy.
Anyway, I an going to audition some Atlantic Technology speakers this week or next. They go down to 50Hz and I hear are very similar sounding to the M&Ks.
http://www.atlantictechnology.com/system_8200.htm
Not sure if I would use the ped woofers on the bottom. If I did, it would give me a full-range speaker, but I wonder if the subs would interact with my subs. I'll let you know.
Roly

 

[billnchristy]

Have you gotten Christmas cards from the Power company yet?

I can only imagine what this sounds like. We did a car back in my days of installing that had 6 kicker 15" powered by several kicker amps, I dont remember the wattage but I think in the 4k range. This car would hit 146db unweighted and it really shook you hard. Even with plugs in it popped my ears and made me a bit queasy.

 

[gmichael]

How big was the alternator? And how many batteries did he have.
I had a friend with that kind of set-up in his car. I'd be out at the park with my home made wedge with 6 Jenson 6x9's cranking and he'd pull up and drown me out. So, I'd turn mine off. About an hour later I was giving him a jump start and pulling my speakers back out.

 

[billnchristy]

I dont remember the power supply aspects, but I believe only 2 batteries. He did have a couple farads of capacitance too if I remember correctly.

The beauty of the system was he didnt buy any of it, he somehow scammed multiple girlfriends into it.

It was something to behold, in a Beretta of all things (back when they still made em, so at least it was a new car).

6- 6.5, 6- tweeters, 6- 15"

Funny thing was, I built a bandpass for a single infinity 10" and used one of his kicker 500s to power it just to check it out, he turned to me and said "Now why do I have all this crap in the back of my car again?" Man that felt good.