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Advice needed to build new 3 way active system

16765 Views 53 Replies 14 Participants Last post by  Zeverin
I'm planning my new system. I want to build a 3 way active system (front speakers).
My current ideia is to use the ULTRADRIVE PRO DCX2496 as the crossover. The amplifiers will be 3 A500 also from behringer (one for each channel).
The drivers configuration will be MTMWW. The tweeter is the Seas 27TBFC/G, the midwoofers Dayton RS180 and the woofers RS270. The box will be sealed because I want the most clean and "fast" sound I can achive. The midwoofers and woofers will be wired in parallel (4 ohm load on the amplifier). I would like to add a third woofer (MTMWWW), but that would have a dificult impedance for the amplifier. Why another 3rd woofer? Because of the added dinamics and lower distortion numbers at a given listening level. Any solutions?
I currently have a TC 2000 15" subwoofer in a sealed box with 110 L crossed over at 60Hz.

Please post your comment and sugestions. Keep in mind that budget is a constraint.
Thanks in advance.
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If you ask me.. (Cost obviously isn't an issue here.) skip the dual woofers since sensitivity isn't an issue. Trade them in for a high quality sub. This will increase overall displacement as well as give you the flexibility to account for various room issues.
Hi bdp. Thank's for the suggestion. I'm afraid that I don't agree completely with you. If I lower the sensitivity of the woofers I need to use more power, more power equals more expensive amplifier (perhaps noisy fan cooling), and the distortion number can raise quicker (maybe, maybe not), and they "only" need to handle frequencies above 60 Hz, below 60Hz my TC 2000 15" is going to take care. I also like the idea of using a bigger surface to move gently the air, than a smaller one moving the air in a more violent manner. Those this assumption makes any sense?
That makes sense to me. I didn't realize you had a sub already. In that case, the high sensitivity is a benefit because you will already have lf extension.

What target listening levels are you shooting for and how much power do you have on tap?
Adding a rear firing tweeter could be challenging but it has the potential to help ease the strain on your current weak link tweeter. IN theory you would have nearly twice the output.

Good luck getting the bass to sound right. It seems like you have to go sealed, due to the large airspace requirements of the rs270. This will hamper response between 30-60hz. OTOH, you will experience boundary reinforcement from the woofers that are close to the floor. I am not aware of any current tool that can simulate this boundary effect.
If you ask me...

You may need the dual midwoofers (rs150?) to keep the sensitivity high enough to get the job done. You could also use the RS125 and perhaps get a cleaner top end out of the mid.

The only real need for 2 tweeters is sensitivity matching. I imagine that 2 mids along with 2 woofers will be too sensitive for a single seas tweeter as posted. This combination hasn't really been done before(at least that I know of) but that doesn't mean that it is bad. I imagine that the reason it hasn't been done before is because the sensitivty of the woofers will likely outpower all but the most sensitive tweeters on the market. You would need about a 95db tweeter to match sensitivity.

+1 on the power response comments. I would suggest considering tese xo points.

woof-mid 400hz lr2
Mid tweet 2000hz bw3.

This will give you a very smooth power response and provide adequate protection for the tweeter and limit mid excursion.
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