DUAL RL-P15 Build - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 51 Old 01-16-08, 01:50 AM
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Re: DUAL RL-P15 Build

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At 750 watts input power cone excursion is reached at 13hz. Hopefully someone else will chime in here as I'm not sure how big a LLT design is supposed to be. Let's call this a learning experience for the both of us!
Well first off, there is no way that QSC will put out a clean 750W at any frequency, let alone 20Hz and below. Maybe 600W @ 20Hz?

Secondly, I actually have the T/S parameters of a Rl-p 15 DVC4 wired in parallel. Naturally they're different, so the sub will model differently.

It looks like you'll have close to 12ft^3 net? I think I'd go ahead and tune as low as possible (36" long 6" port) if you plan on keeping that QSC amp. Might as well gain a little extension since you won't be pushing the drivers too hard. If you ever plan on upping the power, then I'd tune higher.
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post #12 of 51 Old 01-16-08, 03:46 AM
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Re: DUAL RL-P15 Build

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WillyD wrote: View Post
Well first off, there is no way that QSC will put out a clean 750W at any frequency, let alone 20Hz and below. Maybe 600W @ 20Hz?
Thanks for chiming in Will. The above modelling was based on driver limits and not on the QSCs amplifer output. My opinion is it's nice to know what a subs potential is should you decide to use it.



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post #13 of 51 Old 01-16-08, 05:49 AM Thread Starter
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Re: DUAL RL-P15 Build

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WillyD wrote: View Post
Well first off, there is no way that QSC will put out a clean 750W at any frequency, let alone 20Hz and below. Maybe 600W @ 20Hz?

Secondly, I actually have the T/S parameters of a Rl-p 15 DVC4 wired in parallel. Naturally they're different, so the sub will model differently.

It looks like you'll have close to 12ft^3 net? I think I'd go ahead and tune as low as possible (36" long 6" port) if you plan on keeping that QSC amp. Might as well gain a little extension since you won't be pushing the drivers too hard. If you ever plan on upping the power, then I'd tune higher.

Thanks for the input Willy. I don't want to leave anything on the table here. What amp would you recommend? EP2500? I can get that for a good price right now. Would you keep the same tune of 14hz with a bigger amp then?
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post #14 of 51 Old 01-16-08, 07:01 AM
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Re: DUAL RL-P15 Build

I have two Rlp15s tune to 11hz on a EP2500 and had no problems at all, I'm not an expert on designing boxes but I think you should be OK with the 36 x 6 port like Willy said, as long as you not going crazy trying to play 12 or 14hz tone for long periods.


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post #15 of 51 Old 01-16-08, 07:16 AM
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Re: DUAL RL-P15 Build

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Thanks for chiming in Will. The above modelling was based on driver limits and not on the QSCs amplifer output. My opinion is it's nice to know what a subs potential is should you decide to use it.
For sure.

Quote:
Thanks for the input Willy. I don't want to leave anything on the table here. What amp would you recommend? EP2500? I can get that for a good price right now. Would you keep the same tune of 14hz with a bigger amp then?
Well, if you want to stick to 14Hz, then I wouldn't get a new amp just yet. You could build the new enclosures, set them up, and see what happens. If the amp clips and you want more out of the subs, buy a better amp. The EP2500 would indeed be a step up, or you could go another step up. Just depends.
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post #16 of 51 Old 01-16-08, 04:22 PM Thread Starter
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Re: DUAL RL-P15 Build

Well I have updated my design. It will be a 15.8 cuft box net. I will tune it to 12hz so the port will be 29.1 in long. I went with a big box so I could start out tuning low. If I want I can always shorten the port to raise the tune up if needed.

This way I can hang onto the QSC amp and if it does not cut it I will get something different. Is there any other Amp I should look at other then the EP2500?
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post #17 of 51 Old 01-16-08, 04:29 PM
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Re: DUAL RL-P15 Build

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Is there any other Amp I should look at other then the EP2500?
Depends on budget.
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post #18 of 51 Old 01-16-08, 04:33 PM Thread Starter
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Re: DUAL RL-P15 Build

$500.00
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post #19 of 51 Old 01-16-08, 05:25 PM
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Re: DUAL RL-P15 Build

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$500.00
Musician's Friend has a sale on refurb Crown XS900s for $399 shipped (with 3year no-fault warranty). I'd say thats a pretty good deal.
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post #20 of 51 Old 01-17-08, 12:58 AM
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Re: DUAL RL-P15 Build

Any reason for wanting to tune to 12hz with "only" two 15" drivers?


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