have a Laney bc75 for house practice but someone had swaped the speaker for a rubbish one. So I swapped it for a 400w 8 ohm so I could also use the cab with my Behringer Ultrabass 300. What's confused me is my 300 is 300w at 4 ohm or150w at 8 ohm. Am I right in thinking if I put two 8 ohm I will still get 300w or could I mix and put a 4 and 8 ohm together. The 400w speaker seems to struggle which I didn't think it would if my amp is only 300w. Any ideas
Enjoy the benefits of a premium membership!
Upgrade Account
-
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 free Log in
Want zero display ads or expanded classifieds tools? Compare plans.
What speaker
- Thread starter Gary 1963
- Start date
I can't say anything definitive because the only specs I have are the wattage rating and nominal impedance. But, if you have (2) 8-Ohms speakers wired in parallel, the total load will be 4-Ohms nominally. If each one is rated at 300W, then the total capacity will be 600w. That should be fine with a 300w RMS amplifier, but I would need to know the efficiency of the woofers loaded into the cabinet (db SPL), how much headroom the amplifier has (depends on the power supply, design, etc.) and the volume you are trying to reach (in db SPL). The short answer is yes, your amplifier SHOULD work with this new woofer just fine. If you put an 8-Ohm and 4-Ohm speaker together, your nominal load will be 2.67-Ohms and I don't know if this will work with your amplifier. If 4-Ohms is the minimum, you will need to use 2 x 8-Ohm woofers.
