felix_suwarno
Screenwriter
- Joined
- Dec 2, 2001
- Messages
- 1,523
i am just curious. the bostons got nice reviews at audioreview.
If you are using 1, then you want to defeat the crossover built into the sub. If there is an input that bypasses the crossover on the sub use it (I'm not sure if the line level input on the PDR10 does this or not). If there isn't an input that bypasses the crossover then you should turn the crossover as high as it can go. If you have both crossovers operating in close to the same frequency range they will cascade with each other, the results of which will be very bad.
Dustin, I understand what you are saying. However, with this specific sub (PDR-10) setting the sub's crossover at 100hz flatten's the frequency response curve of the sub considerably. The effect is that one does not get an increase in volume output starting at ~50hz thru 100+hz with this sub, but a flatline from >20hz through 90hz, where it starts to falloff.
I've got this paired with Paradigm Monitor 7's, and the frequency response curve for the entire setup is pretty flat from 150hz through ~20hz, with a hump at 35hz that I attribute to the ceiling height. In other words even though the receiver's and sub's crossovers are only 20hz apart, I'm not seeing a crossover cascading effect in the system's overall output. I've got the sub under a coffee table in the middle of the room, so I'm not getting any corner load humps/nulls.
Now, this thing is only going to peak at 90db's, but I have found this to be OK with my listening habits and this room. I've barely got room in the corner for an SVS (and the required BFD), but I'm holding off on this for awhile as the system is simply loud enough. I do miss the low frequencies (Titan A.E. is a favorite ), but I'll get around to it.
jdg
I just ran the sweeps with the PDR10 instead of just my Tempest at matched levels (around 85dB at 90hz). The PDR10 dropped off 10dB more than the Tempest as the sweep went below 25hz. I then took it up closer to 100dB and the Tempest showed the exact same drop off while the PDR10 dropped off 5dB further (this is referencing uncorrected numbers, so really the Tempest just didn't drop off, and the PDR10 dropped down 10dB or so). The PDR10 was straining pretty bad at this point, so I didn't go any higher with it. I took the Tempest a little higher, but it got scarry (my windows are old).
Cool. That follows with what I have: I can imagine that I'm getting a room effect peak from 40-30 HZ, and if you draw a straight line from 50Hz to 25Hz I get a 5db drop. It sounds like your Tempest addresses the weakness of the PDR very nicely!
As for using the Avia sweeps, if you repeat them numerious times and record various Hz levels, you can get a decent amount of data.
Have fun.
jdg