• TalkBass has been independent since 1998. Add your voice.
    Create a free account to reply to discussions, view embedded media, and browse with fewer display ads.
    Join freeLog in
    Want zero display ads or expanded classifieds tools? Compare plans.

Double Bass Pjb flightcase as "powered speaker"?

I'm thinking of going "Grenadier" for the quit gigs, that is using a microphone (Dpa 4099b) + preamp into a powered speaker. Since money's tight, I wondered if a Pjb flightcase could do the chore. I'm thinking I could go line in from the mic pre (D.A.V to headway to Pjb). Then there is the feedback issue, which warrants the speaker to be at ear level, so I have to find a way to mount the flightcase to a speaker stand. Could this work?
Has any of you tried this?
 
I'm thinking of going "Grenadier" for the quit gigs, that is using a microphone (Dpa 4099b) + preamp into a powered speaker. Since money's tight, I wondered if a Pjb flightcase could do the chore. I'm thinking I could go line in from the mic pre (D.A.V to headway to Pjb). Then there is the feedback issue, which warrants the speaker to be at ear level, so I have to find a way to mount the flightcase to a speaker stand. Could this work?
Has any of you tried this?

Kaspar,
Chris F uses a Headway into his PJB Superflight Case. You could P.M. him about it.

Ric
 
I didn't have much luck with a mic and the super flightcase because of the feedback issue. Part of the charm of the pjb is its ambient nature, which is contrary to the notion of the speaker being out of "earshot" of the mic. I also don't think it's a good option for pole mounting, as something about the design of the PJB has taken floor coupling into account:

PJB manual said:
Positioning the SUPER FLIGHTCASE for Best Sound
Often, playing in different venues will cause your bass to sound different. This is partially due to the acoustics of the hall influencing the low frequency waves that are coming from your speaker. Bass waves are large and room dimensions heavily influence them when the walls reflect the sound waves, causing them to collide by adding together or canceling each other out. This causes some fundamental notes (the ones you feel more than hear) to ring out louder than others and some notes not to be heard at all.
Here is an indication of where fundamental bass frequencies are, showing open string's approximate frequencies and acoustic wavelength:

(chart didn't copy but the manual can be found [Invalid or Expired Link Removed])

This may give you some indication of the offending notes (frequencies) that may be booming or resonating louder or quieter than others. For example if your speakers are five feet from a wall, the open A string may sound weak. That could be because the path length of the reflected sound off the wall from your speaker is exactly corresponding to half a wavelength on the open A string causing at that particular note to cancel out.
Where you position the SUPER FLIGHTCASE will ultimately affect your low frequency limit. For best results keep the SUPER FLIGHTCASE on the floor. Placing it on objects off the floor will cause it to sound thin and lack bass punch. Placing the SUPER FLIGHTCASE with the back close to a wall will help reinforce the lower notes. Placing it in a room corner will further enhance the low notes.
Room size makes a large difference in how deep the bass will sound. The further the distance to the listener the less the bass will be. This is due to the physics of acoustics not the unit itself.
Unfortunately for bass players, low frequencies are always very difficult to control with room acoustics. The reproduced wavelengths of the notes you are playing often correspond to the room dimensions, in which case the reflected sound off the walls interferes with the sound from the speaker as you get further away from it.

If I were going to be going with the Grenadier approach, I'd try one of the powered speakers (like the new QSC line, which I'll try first if I ever decide to go this route again) and make sure that I get it up and over the bass.
 
Thanks Chris

You're right, there goes my chance of saving a little € :hmm:
Well, I guess a top-of-the-line QSC isn't the only way to do this;
perhaps a Yamaha MR 250 or Mackie Thump 12 can deliver too... i hope!

Kaspar,
You should go here and read the thread on Headway EDB-1 and the QSC k10 and k8 http://www.talkbass.com/forum/f4/headway-edb1-preamp-574997/index7.html. So far no one on that thread has mentioned other possible combinations with the Headway. It's a long thread to maybe I missed one.



Ric