A question on additionnal enclosure

johnfender · #1 10-10-2011, 11:17 AM

Hi,

i have a SVT 3 PRO and an ampeg portaflex 210 8 ohm. Could i plug in a 4 ohm to my #2 entry ? 'Cause it's wired in parallel, it will make 8+4=12/2=6 ohm.

The SVT 3 pro head is given for 4 or 8 ohm but nothing for 6 ohm.

Any opinion on the subject ?

Cheers,

John.

Bass_Pounder · #2 10-10-2011, 11:33 AM

Ummm.................

A 4 ohm cab with an 8 ohm cab is a 2.67 ohm load

Unless you amp can handle 2 ohms, don't do it.

Lastly, even if your head could handle the load, the 4 ohm cab will be getting 2/3 your power output, while the 8 ohm cab gets only 1/3.

johnfender · #3 10-10-2011, 11:48 AM

It's not for any gig, just for home studio. I don't understand why it's close to 2 instead close to 6 ?

Bass_Pounder · #4 10-10-2011, 11:52 AM

Quote:

Originally Posted by johnfender

It's not for any gig, just for home studio. I don't understand why it's close to 2 instead close to 6 ?

Then you need to read up on Ohms Law

Ohms FAQ

will33 · #5 10-10-2011, 11:59 AM

Quote:

Originally Posted by Bass_Pounder

Then you need to read up on Ohms Law

Ohms FAQ

Yup.

Using a series cable would allow you to do it although all the same mismatch stuff would still apply.

RickenBoogie · #6 10-10-2011, 12:00 PM

+1 no workie. Just use one cab OR the other.

johnfender · #7 10-10-2011, 12:08 PM

Ok, so i can't use it for my home studio recording :/

Thanks a lot for feedback

silky smoove · #8 10-10-2011, 12:20 PM

For recording purposes a 210 should be more than sufficient. You don't need more volume for recording, you need a single cab that sounds the way you want. Use one or the other based on your needs for the session and be done with it.

johnfender · #9 10-11-2011, 11:02 AM

I'de read it's recommended for get good result in home recording to combine both 10 and 15 format. It's why i was trying to reuse my 15' amp.

silky smoove · #10 10-11-2011, 11:36 AM

Not sure where you read/heard that, but I wouldn't put much stock in it as a "best results" solution. It might work very well, or it might be a lot of wasted effort.

The simplest way to get consistent results is going direct. You'd be shocked how often bass is done this way in pro studios.

The next step up, and my personal favorite is splitting and blending a direct signal with a single mic'd cab where the mic'd setup provides most of the "color" (typically low mids through upper mids along with any level of drive/saturation that seems appropriate), and the direct signal provides the top and bottom, along with whatever midrange content you'd like to blend with the mic'd track. Make sure and manually align the mic'd track to the direct track in post for best results.

You can go beyond that if you'd like, but there's a diminishing return on time and cost for most studio applications, unless you're doing something that's really "out there." Good luck!

will33 · #11 10-11-2011, 11:42 AM

Quote:

Originally Posted by johnfender

I'de read it's recommended for get good result in home recording to combine both 10 and 15 format. It's why i was trying to reuse my 15' amp.

Don't know where you read that but stop reading it. It's not the best idea for recording or live use unless you just plain need more output and don't have any other options.

James Judson · #12 10-11-2011, 12:04 PM

That SVT III handles a 4 ohm load. An 8ohm and 4 ohm cabinet in parallel comes out to be 2.66666666 ohms. Your equation is wrong. Look up ohms law to verify this. You may get away with an impedance mismatch as long as you don't turn it up but I wouldn't chance it.

When it comes to recording, try anything and everything. You will be surprised how well just plugging straight into the board works. Opinions are good, experience is better but creativity is where its at. When it comes to art , someone saying abc works best or xyz doesnt work, take it with a grain of salt.

johnfender · #13 10-13-2011, 12:27 PM

I will test the blending of both direct and amp signal. I'm not close to any option. The mix of 15 and 10 was given in a pro recording guide. But anyway, it's just an idea at the end.

Thanks a lot for your greats advices

silky smoove · #14 10-13-2011, 12:55 PM

As I mentioned earlier: when blending a DI and mic signal, make sure and align the mic signal to the DI signal in post for best results. The difference will be minimal, but it helps to eliminate phase cancellation between your recorded tracks.

Alex1984 · #15 10-13-2011, 12:57 PM

Unless if the 15 and 10 were non-fullrange speakers and your signal is bi-amped, it's probably not a good idea. A fEarful cab on the other hand, might be, with dedicated low and mid drivers. I used to believe that 15s are lower and 10s are faster too, but it's a myth that gets busted on here many times a week. As for the impedance, 1/4 + 1/8 = 3/8. So the net impedance is 8/3 = 2.67 ohms, which would be too low for your head.

johnfender · #16 10-14-2011, 05:30 PM

A myth ? Really ? I'm not sure...

I have both and i can found a real difference betwen my ampeg 15 pratice amp and my portaflex 210. Ok, the price is not the same betwen these two, but even with that, each one have a dedicated range with quality and default. I like both and would like to combine them to test.

@silky smoove : Sure but why not align Di sound to the amp phase ? I think the delay will be more realistic, no ?

silky smoove · #17 10-14-2011, 05:47 PM

Align the mic to the DI. In a studio environment you want everything as tight as possible (typically). The difference will be minimal, but the DI will be the closest to being "on" of the two. You could do it either way, but the mic will always be slightly behind the DI. That means the DI is most representative of the moment you plucked the string.

Again, the difference is very minimal, so doing either is better than none at all. My preference is always the DI though.