stevie

Thanks, JTUK - that's really helpful.

[quote name='Beer of the Bass' timestamp='1426526388' post='2718893'] But isn't the vertical dispersion for a stack of full-range cabs determined by the total height of the array, rather than the individual cabs within it? I am not quite seeing how there could be a predictable difference either way round. [/quote] That's true when you're in front of and some distance away from the speakers, in the audience say, but not so much when your ears are above the cabs. Standing 1 metre in front of a 15"/2x10" stack, a 1.5 kHz signal coming from the 15" will be around 15dB quieter than the same signal coming from the tens, which is not enough to interfere (and reduce dispersion). You might as well have the box that has the clearer HF nearer your ears.

Thanks, Dad. That looks close to the original (not very great) bassline. Any chance you could try re-posting the midi? It doesn't unzip to anything because it's too small.

Yes to the first question. Perfectly applicable (to the second). You'll get cancellation between the drivers but you'll get that whether the 2x10 or the 15 is on top. In terms of hearing yourself with a traditional 1x15, 2x10 setup, vertical dispersion is more important than horizontal because your ears are normally above the cabs - unless you're a goodly distance away, when the angle diminishes.

I bet you've got one tucked away somewhere. I know it's one of your favourites!!

Yes, I know what you're going to say..... but the band insists on doing this - nothing to do with me. Does anyone have a half-decent arrangement of this for bass, in view of how rubbish the original is? A transcription, or preferably a midi, would be perfect.

Forget about sight reading books; the ones I tried were a waste of time. Try this: http://basschat.co.uk/topic/74284-the-majors-bass-boot-camp-session-index-1-36/f - an amazing resource!

[quote name='icastle' timestamp='1426452561' post='2718214'] 2x10 on the top. From a mechanical perspective it's far more stable and from an audio perspective it's easier to hear the higher frequencies if they're not round your ankles. [/quote] This. You'll normally hear much more top end from a 2 x 10 than from a 15 because of the dispersion characteristics of the larger driver. A 10 starts to "beam" about half an octave higher than a 15. This is especially true when you're standing close to the cab, which many of us have to do for various reasons. So, for greater definition, put the 2 x 10 on top. A 4 x 10 is a slightly different kettle of fish, by the way. If you can't hear what I'm talking about, you may not have know what to listen for. Try it and all will be revealed.

There are a few problems with the design of the crossover used in the Fearful 15/6. I can't speak for the Barefaced equivalent, although I believe it's more or less the same design. More specifically, the crossover causes the system impedance to drop by nearly a half in exactly the area where the amplifier is expected to produce its maximum power, between 100 and 200Hz. This will cause the impedance phase angle to plunge close to -60 degrees in the same area. Together, these produce something of an amplifier-crushing load that not all amps will be able to drive satisfactorily. To test the theory, just disconnect the 15" driver from the crossover and connect it directly to TH500. Or, as already been suggested, try another speaker.

It looks like a Goodmans Axiom 22 MkII and apparently worth a lot of money to the right collector.

[quote name='Conan' timestamp='1416836439' post='2614035'] Sounds like a Barefaced Big One would suit you perfectly Stevie. Probably a bit lighter than your Ashdown-based cab(s) too... [/quote] Indeed! I really like the concept of the Big One, but I am not a fan of their cabinet material. The Ashdown as it is now is about 18kg and very compact. With castors, it's quite manageable.

Oh yes, and my cab is fitted with sturdy side handles so that the box doesn't hit me in the shins when I pick it up.....

I can't say that I have a favourite as such, Jack. I've played quite a few boxes that were OK, but nothing that has really blown me away. From a sound reinforcement point of view, most offerings still seem to be stuck in the 1970s. A 12" or 2 x 12" and a tweeter is what HH used thirty-odd years ago. PA has moved on, but bass cabs not so much. I'm a fan of the separate midrange driver approach pioneered for bass cabs by Greenboy (which actually has its origins several decades earlier in the Electrovoice 15/3). My own cab is an Ashdown Mini 15, modified by adding castors, bracing, damping, changing the ports for flared ones and fitting a BMS 15n620 driver in 4 ohms. I use it with an 8" midrange driver in a separate cabinet with a crossover I designed and built myself. To improve dispersion in the midrange, I'm going to swap the 8" for a 6.5" when I get around to it, and I have a couple sitting on the shelf in my workshop waiting. I also have a few interesting 12" drivers waiting for Phil to supply a cab for the Cab Design Diary thread but I don't think any of them will make me change from the BMS. My amp is a Markbass LMIII. For your info!

[quote name='Conan' timestamp='1416815748' post='2613741'] Does that not strike you as an incredibly arrogant comment? Agreed. Some do. But then again, some people seem to circle above BF threads like vultures, waiting to make sniping and facetious comments while adding nothing to the discussion. It's been this way for some years now, and clearly neither side is going to adopt the other's viewpoint. Let's just agree to disagree? [/quote] What has been the case for some years in these threads is that, sooner or later one, of the the Barefaced fanboys will start taking aggressive and personal potshots at anyone who expresses the mildest critisism of their beloved boxes. Like calling them "arrogant", for example, or "vultures" and describing comments as "sniping and facetious". And then - and I love this - they have the cheek to claim that posts, which are actually on topic, add nothing to the discussion.

[quote name='Bill Fitzmaurice' timestamp='1416778219' post='2613561'] Only at small signal levels. Maximum output is determined by the driver xmax. That's usually the same for 4 or 8 ohms, so maximum output is also the same. [/quote] While this is usually true in practice, it's not always the case. Sometimes maximum output is limited by what the amp is able to deliver, in which case a 4 ohm cab can be very worthwhile.

I seem to have hit a nerve......

No, but some of my best friends are.

Is he a Barefaced user? I imagine he appreciates their light weight.

Did someone mention feet falling off?

[quote name='skidder652003' timestamp='1416752567' post='2613164'] sooo this!! [/quote] I am reminded of a song by Paul McCartney and Stevie Wonder. I have a white one, so to that!

[quote name='JTUK' timestamp='1416760708' post='2613264'] I've had the same cab in 4 and 8 ohms ( 212 config ) and they sounded pretty different...to the point that I loved the 8ohm version and I've never really been that convinced about the 4 ohms version.. seriously...!! [/quote] Actually, the 8 ohm and 4 ohm versions of drivers are often different enough for it to affect the sound. So that makes sense.

So how exactly do you measure the impedance of a big door ......?