THAM 15 built - now need parameters

[nunyagd]

Hi Al -

I've finally completed my THAM 15 and need your help to set it up. Based on using the B&C 15TBX100, could you help me with:

- RMS power handling: where should I set the limiter
- Crossover: Any suggestions on HP and LP and slope

Thanks in advance!
Jeff

 

[nunyagd]

Anyone? I can figure out the crossover but really do need some insight on the limiter.

 

[chris661]

Your limiter settings will depend on your amplifier. Modern switch-mode amplification does a good job of RMS limiting - they can do huge peaks, but the old iron amps tend to beat them when it comes to sine waves for hours at a time. So yes, what are you using to power your cabinets?

The crossover should be low enough to eliminate the out-of-band hash at the top of every TH's passband, and the highpass filter should be a couple of Hz below the last excursion dip. For a THAM15, about 40Hz, 24dB/octave Butterworth.

Chris

 

[nunyagd]

Your limiter settings will depend on your amplifier. Modern switch-mode amplification does a good job of RMS limiting - they can do huge peaks, but the old iron amps tend to beat them when it comes to sine waves for hours at a time. So yes, what are you using to power your cabinets?

Thanks Chris - I'm planning to use a Behringer inuke nu3000DSP which should put out ~1250 watts RMS into the 8ohm load.

 

[chris661]

If you bridge it, yes. Peak power (see here: Behringer iNUKE NU3000DSP - Speakerplans.com Forums - Page 1) will be more like 1700w.

In that case, I'd probably say it'll be fine without limiting - the amp specs are well in-line with B&C's specifications. If you're planning on ragging it, or sending it out on hire, then something around -6dB with a long attack and release time will ensure LF feedback or high-power sine waves are attenuated suitably.

Chris