whats so bad about mixing subs

[ThomasG 5,000+ posts]

its a big no no dont do it

 

[Ogener]

thank u know i know why. I totally forgot about the cancallation stuffs. I wasnt going to try this box anytime soon as my 2 pheonix gold 15s do me fine but this was something i wanted to try and i prolly wont due to the extra work and hassle

 

[ngsm13 5,000+ posts]

It's called cancellation.

Also, it's superfluous. Why use all different sizes, when one size still covers the entire audbile sub-bass range?

nG

 

[phantom240 5,000+ posts]

Not only would mixing different sizes be bad, but each driver has its own characteristics.... if you could find drivers that are specifically built to play certain ranges and use bandpass crossovers the system COULD sound very good. Unfortunately that takes a lot of time, money, and space... and in all honesty I dont htink you can do it.

 

[Amokie 10+ year member]

it would be kind of cool if you crossed them over at different frequencies, and had a 3 way sub stage, but a waste of time.

 

[DBfan187 5,000+ posts]

whats so bad about mixing subs?

it's like paying a hooker for *** just to find out that it's really a guy, it's just wrong!

 

[helotaxi 5,000+ posts]

Getting the 3 different pairs to blend correctly would prove pretty much impossible. For the best response ideally you want as few drivers as possible on each channel because each time you add in a crossover, you mess with the relative phasing of the signal. Combine that with the fact that you will end up with different phasing from the different drivers themselves and you will end up with a tremendous mess.

 

[creyc 10+ year member]

helotaxi never disappoints with his knowledge. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

I think you could probably get 15's and 10's to blend well, assuming you could test every 15 and 10" drivers and of course knew exactly what you were doing designing a crossover for it. Ultimately you could end up with something comparable to a good 12 or 15 install. If your name was Dave Wilson you could probably make it work right. If you're asking this question, good luck, study and let us know how you do! //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[expo5.0 10+ year member]

at least he asked

 

[SAG3 5,000+ posts]

Getting the 3 different pairs to blend correctly would prove pretty much impossible. For the best response ideally you want as few drivers as possible on each channel because each time you add in a crossover, you mess with the relative phasing of the signal. Combine that with the fact that you will end up with different phasing from the different drivers themselves and you will end up with a tremendous mess.

Yeah

 

[JohnBlayz142 10+ year member]

It's not like crossovers *cut off* frequencies completely....that's what a db/octave slope is all about.

The higher the db/octave slope, the more abruptly your crossover is going to cut off the frequencies.

Hope that makes sense....basically what I'm saying, is that the 10's and the 12's would play some of the same frequencies, and the 12's and 15's would as well.

Just don't do it. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[helotaxi 5,000+ posts]

^^^ The roll-off of the filter is the least of the problems. The only way it would work easily is if the individual drivers had the same output phasing (some of this could be addressed with time alignment, but good luck getting that many channels of TA) and a perfect filter, i.e. no phase delay effects from the filter itself. A digital crossover could cover the latter but getting the drivers and their enclosures acoustically aligned would still be a ton of work. The difference between the final result of this and a a substage with 4 properly setup and enclosed 12s would leave you with a really bad taste in your mouth because, in effect, you would have spent 2-3x as much for pretty much exactly the same result. Add in the work involved in tuning it and you'll be taking a sledgehammer to the whole thing.

 

[RedlineAccord 10+ year member]

at least he asked

Ya, gotta give him some credit. A lot of us started out without knowing jack shit and just throwing together some best buy/circuit city subs into a trunk and calling it a crazy system. I wish I would have known better and been on this forum 2 years ago before I spent a bunch of money on junk. //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

 

[JohnBlayz142 10+ year member]

^^^ The roll-off of the filter is the least of the problems. The only way it would work easily is if the individual drivers had the same output phasing (some of this could be addressed with time alignment, but good luck getting that many channels of TA) and a perfect filter, i.e. no phase delay effects from the filter itself. A digital crossover could cover the latter but getting the drivers and their enclosures acoustically aligned would still be a ton of work. The difference between the final result of this and a a substage with 4 properly setup and enclosed 12s would leave you with a really bad taste in your mouth because, in effect, you would have spent 2-3x as much for pretty much exactly the same result. Add in the work involved in tuning it and you'll be taking a sledgehammer to the whole thing.

You went into it a little bit more than my knowledge allows me to....interesting, though. What exactly is output phasing? Does it have to do with running different phases for the different pairs of subs we're discussing?

I do understand time alignment however, such as that found on some Alpine head units....