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Does a 1x15 have any advantage over a 1x18?

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I've owned and played a smaller 15" Trace Elliot cab full range with a Trace 4-10 and liked it . An advantage to a 15 over an 18 is obviously size .
I've owned a 2x15 cab loaded with JBL E140 transducers and loved it .
I built and played and loved ( the cab actually sounded really good all alone and I could crank the heck out of it ) a single 18" cab with a JBL 2241 Transducer . It was a bulldozer and sounded kick ass , surprisingly good crisp clean bass tone . Iam a fan of JBL VGC series transducers . The one thing I did not like was it's big chunky size . The mids and high end we're believe it or not to my liking . I played in a really really loud metal band and the guitarists were always like can you turn that thing down some . The first time I jammed with them they were admittingly thinking the cab wasn't going to do much . I powered it with a crown K2 and Sansamp RPM and my axe was a Modulus Vintage Jazz with DR Hi beams and I played with a pick . The setup absolutely ripped .
Not all speakers are created equal, assuming tonal needs on just size can be misleading . Speakers have character and you really need to physically try stuff out . When you try to decide on a cabinet with just your mind thinking oh what I need is a 15 or an 18 or whatever without trying it first you could waste money and end up not liking it . Try it first if you can .
 
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It depends...

This.

I ran a Gibson Ripper with Rotosound 66s through an old Acoustic 150 guitar head into an Acoustic 301 folded horn 18" cab as a club rig for several years - and it sounded great. Got lots of compliments on the tone.

Change anything in that combination and the results could vary greatly.

You can't make a judgement call on speakers taken in isolation. There's the cab design (a poor design can make even a premium speaker sound bad), the amp characteristics, the instrument characteristics, the music genre, and the player.

It's a balancing act. The above combination got used with a classic style originals progrock band. I don't think I'd want to use that same setup for a heavy duty blues gig.
 
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big speaker.jpg
 
Personally I like the reaction time (feel, string feel) with sealed 10s, it's become my thing. 15s are okay but when I added some 10s, it always sounded better. I played for years using the 115+210 combo (for medium sized gigs) and old superseded the 115 when I acquired a 410. I do not have much experience with 18s but I know I don't like the feel BUT they do have their place, just not with me.
 
This.

I ran a Gibson Ripper with Rotosound 66s through an old Acoustic 150 guitar head into an Acoustic 301 folded horn 18" cab as a club rig for several years - and it sounded great. Got lots of compliments on the tone.

Change anything in that combination and the results could vary greatly.

You can't make a judgement call on speakers taken in isolation. There's the cab design (a poor design can make even a premium speaker sound bad), the amp characteristics, the instrument characteristics, the music genre, and the player.

It's a balancing act. The above combination got used with a classic style originals progrock band. I don't think I'd want to use that same setup for a heavy duty blues gig.
Not a lot of information to go on for this quest. I'm reading a lot between the lines, but I gather weight is not much of a concern for OP?

Also guessing he fell in love with a 2 x 15. Maybe one he can't get ahold of. That's what leads me to believe swapping the 18 to a 15 is going the wrong direction. A different 2 x 15 (in place of the 4 x 10) may or may not get him going.

OP, what is your goal as far as tone and can you get the 2 x 15 from your friend? Maybe find out whats in it and try to find some used drivers and copy it? Then you can try it with the 4 x 10 and then the 18 and see how either work out.

Have you tried the 18 alone?

But, yes its a try before you buy. Or build : D
 
What you should be asking is if a 410/118 or 410/115 works any better than a 410/410. In most cases it doesn't. The average 410 has as much displacement, meaning it will move as much air, as the average 118, and more than the average 115. A 115 or 118 may go lower than a 410, but that depends on the 115,118 and 410. A 410 probably goes higher than a 115 or 118, but that also depends on the 115,118 and 410, so the first response you got saying 'it depends' was as definitive a reply as anyone can give you. With enough engineering data you could make a very educated guess about how any two cabs will work together, but since that data is probably not available for any cab that you don't build yourself 'try before you buy' is the only way to know what you'll end up with as the best combination.
 
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18's are really optimal 120hz and below, although capable of going all the way down they are not what I consider bass rig speakers. I would rather have 2 4x10 cabs as 4 10" speakers is more cone area than 1 15". Many are looking for as much low end as they can get but as as Bassist and Audio Engineer a nice balance with mids makes for tight and intelligible bass tone instead of the last last note drowning out the next not to mention drowning out other members of the band. This is especially true when playing through a PA system with subs, let them do the work and if your stage bass level is already too much either the engineer will ask you to turn down if he cares to get some bass in the PA. If he doesn't care he will just leave you out of the mix.
 
...Is there any advantage the 1x15 would have over a 1x18?
Yes, two. A 115 will more likely be lighter and easier to move, and there are more 115 options available.

Is there a tonal advantage? It depends on the 115 and 118 drivers and how they pair with your 410.

What I would do is try everything I could to see what works best. Who knows? There could be a single 212 cab out there that just does it right for you.
 
Not sure if its feasible, but if you love your friend's 2x15, maybe consider buying that exact cab? There are so many factors aside from speaker size that are contributing to the tone. It woukd suck to buy a 15 and still not sound the way you want.

This exactly. You could spend $2,000 on the most high-end, boutique 2x15 cabinet... but it wouldn't sound exactly like your friend's homemade 2x15.

A good place to start is to pop out the drivers and check if they have any identifying brand/model markings.