Seeking wisdom for Phil Jones Bass Amp rig…

Gents…

Long story short…
• I purchased an 8T
• I used it with my Ampeg SVT 3Pro and fell in love
• I purchased the PJB M-500 amp, connected the 8T and the love grew deeper
• Because the 16B was 130lbs… I decided on the 6T/9B cabs
• So… I have the M-500 sitting on top of the 6T which in turn sits on the 9B
• I have been unable to sell the 8T so I want to use it as part of the current rig configuration if I can
• More 5” speakers make for greater bottom end…

Now the technical side…• 6T is 12 Min Imp Ohms
• 9B is 8 Min Imp Ohms
• 6T/9B combined is 4.8 Min Imp Ohms
• 8T is 16 Min Imp Ohms (equivalent 2x10”)

How do I connect these speakers in a way that will enhance my rig?

The manual states:
DO NOT CONNECT CABINETS TOGETHER THAT HAVE A DIFFERENT NUMBER OF DRIVERS ACROSS. (EXAMPLE: A 6T ON TOP OF A 16B This will put more power through the top cabinet, making it work harder and will limit your total power handling.)

However…???

M-500 Specifications:
RATED POWER:

• 8 Ohm 280W
• 4 Ohm 510W
• 2 Ohm 720W

S/N RATIO: >85dB
FREQUENCY RESPONSE: 10Hz - 20kHz
DISTORTION THD: <0.05% @1kHz 1/10 Rated Power
OUTPUT CONNECTOR: NL4 Speakon

 

THANKS PHIL! I am posting your response for the benefit of others...

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As the designer of this equipment, I strongly suggest that you do NOT disconnect one driver on the 9B and wire it to 4 ohms, leaving one driver to be "freewheeling". This will cause this odd driver to act as a drone cone or passive radiator seriously impairing the bass performance of this enclosure.

Acoustic loading of loudspeakers is an exact science these days and it is not possible to improve the performance beyond what these cabinets can already do.
Anyone who even tries or suggests something like this is showing they do not have the thorough understanding of loudspeakers.

If you need expert advice, you are always welcome to contact us direct by email or phone.

Phil Jones
www.philjonesbass.com