Currently Being ModeratedDec 12, 2011 8:22 PM (in response to westicle1986)Re: Run a Spider IV 75 with a 2 x 16ohm speaker cab?
Two 16 ohms speakers should work....that would be an 8 ohm load...As long as you left the internal speaker disconnected I don't see much of a problem with that...I don't think that amp would play well with a 4 ohm load...
This kind of stuff voids the warranty, but it can be fun for those that enjoy this sort of thing...I did a similar modification to my Flextone III XL several years back to run a 212 in tandem...
More efficient speakers would give you more peceived loudness... Stock, you have 75 watts running into an 8 ohm load...The stock speaker is basically a Seventy80 or very close to that...That SPL rating is 98 db...If you found speakers with an SPL rating of 101 db or higher, then you would have the same loudness as using a 150 watt amplifiers with the same stock speaker...Basically a +3 db increase in SPL is the same thing as doubling the power...Sometimes SPL is called "Sensitvity"...Doubling the cone space by using two speaker will give you some additional volume increase...Also, if you use something like a sealed design you will gain some addtional efficiency...
Currently Being ModeratedDec 12, 2011 8:31 PM (in response to spaceatl)Re: Run a Spider IV 75 with a 2 x 16ohm speaker cab?
Thanks for the quick, super detailed response!
Ok, I will roll ahead with Project: Cabinet as planned. I had planned an open-back cab but I'll try the sealed route now.
I intend to keep the speaker (stock Celestion for now) still in the box, but I'll just disconnect it when I play live and use the cab I'll be building. My girlfriend bought the amp for me and I can't bring it back for the larger 150 now.
Thanks again! Your insight is greatly appreciated