# PSIPHON

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1. ## Xti 4000 with JBL MRX525

Yes they are, and I would advise agains the purchase of dual 15" driver units. This is becuase if you eevr decide to get subs you will be left with a system that is large and heavy. If you vuy the 515s then you can get pole mounts and, at a later time, if you deciede to get subs you can get single or dual 18's and be fine size and weight wise.
2. ## Duty Cycle and 1/8 to 1/3 Power Questions

Thankyou that helps VERY much, espeicaly the rough coorilation between a 50% duty cycle and the 1/8 power pink noise. - Eric
3. ## What is the Benefit to Parallel Mono?

What is the Benefit to Parallel Mono? This is something that I have seen before and seeing it being asked again on the forums has re-raised my curiosity. Assuming my understanding is correct BRIDGE-Mono is the summation of 2 channels that are out of phase to generate a a wave double of the magnitude that one would gain from running a single channel under the same circumstances. Now If my understandings are correct this is making a circuit in series which lowers the damping factor because you are doubling the resistance of the output circuitry. EX: if 1 ch has a resistance of 0.04 ohms and is being loaded with a 8 ohm load this results in a damping factor of 200. But, If you mono-bridge (series the channels) you get a amp resistance of 0.08 resulting in a damping factor of 100. With that example stated can one assume that by paralleling-mono'ing 2 channels together using the previous examples parameters one could gain an amp with a 0.02 resistance thus resulting in a damping factor of 400 into a 4 ohm load? And, if this is the case can some one please fill in the blank?: (assuming: amp ohm = 0.04) 1ch @ 4 ohms = 100 watts (DF = 100) 2ch bridge @ 8 ohms = 200 watts (DF = 100) 2ch parallel@ 4 ohms = ??? watts (DF = 200?) Can some one help with this?
4. ## Duty Cycle and 1/8 to 1/3 Power Questions

I have been looking over several pieces of information and am trying to gain an understanding of what I am running my amps at and what kinda of power draw I am incurring. (assuming perfect [for the sake of example] conditions 120v lines) From what I have read a 1/8th power pink noise generated signal is equivalent to running music just at/below clip (no clip indication from amp, and source is <0db on a +4dbu -> 1.4v (+4dbu?) amp input. If this is correct can I assume: If an amplifier is rated for 12A draw @ 1/8 power then running either full range or just bass (40-120hz) at <0db (from the mixer given previous stated parmeters) will also yield a 1/8 power load on the amp? Also, what is the correlation between the 1/8, 1/3, full power rating system and the 10-50% duty cycle rating system? Can I assume that 1/8 power is a 12.5% duty cycle and 1/3 is 33.3% duty cycle? (I don't believe this to be the case but its the only logical correlation I can make) Thanks for your time. - Eric
5. ## CE2000 Pops in Bridge mode

Im sorry for my poor termonology, I have one (1) of these dual 18" cabs taht i am running the amp into in bridge mode at 4 ohms. Im not sure why the amp makes popping noises. Everything is wired correctly. +1 +2 Amp Channel 1, Switch set to Bridge Mode +1 -1 To speaker (single box) with 4ohm rating. Signal to amp is going through a crossover @ rouglky 120 Hz. If clip light flicks in bridge mode nasty pop noise comes out speaker; but in normal mode (660w @4ohm single line to cab +/-1 to +/-1) nothing major the light just flicks.
6. ## CE2000 Pops in Bridge mode

I have a Yamaha SW218V (cont 1200 / peak 2400 W) that im tying to run on my CE2000 in bridge mode. I set the amp to bridge and i repinned the cable to +1 +2 on the amp side. normaly if i accedentilay flicker the clip light no big deal you dont really hear anythign and i know to pull back, which doesnt susulay happen any way becuase i have everything set at level. But in bridge mode if the clip light flickers i get a nasty pop noise out the speaker and im really concerned. Do you know what is going on? When i run the subs off one channel it can handel the full 660 no problem even if the clip light flicks, and the whole system is fine. Whats going on here?