funkydoug

Totally unlined. Yep I'll add some. Did that to one of my other Ashdowns lately, easy job and quite satisfying. That one sounds great now. I put a new crossover in it and lined it, having learned a lot from you and a few others here. This one remains in factory condition and while the amp is great and the combo is ideal in lots of ways there are a few modifications in mind: lining it, maybe bracing it and working out what to do about the low end, hence this thread. I'll measure properly this weekend and report back. 👍

Thanks Stevie, I'm not with it just now to measure up, but I took this shot of the baffle when I was inspecting the driver. Think a 4inch port might just fit . Will measure it when I can. Very much appreciate the input guys. Also, you'll spot that while the other cabs and combos in this NEO range have APT80 tweeters the baby of the bunch got what looks like a pretty basic piezo. No complaints on how the tweeter sounds though.

Might put an Eminence SC10-16 in there. On the face of it, it looks like a downgrade but it seems like a better fit for the box and amp. Would see no more than 100w from the amp at 16ohms, and is designed for sealed cabs. Won't sound massive but might sound right for a nice small 10. Hmmm...

Yeah I've really enjoyed those threads, and was impressed by your combo version too! I don't have tools or any space for a project like that (yet!) so I'm thinking that modding and / or modelling might be a good way to start tinkering. This one is actually a nice and quite rare little combo so I'm not going to hack into it unless I am sure it's a good idea. I've done that before ... some here might remember... and although it worked out ok in the end, it was pure luck!

Its an Ashdown combo, like this: https://ashdownmusic.com/products/abm-c110h-400 Very nice little amp, and very handsome too, so I'm not in a hurry to mess with it, just exploring options as to how to get the most out of it. I think I've underestimated the volume ... It must be more like 55-60litres but I can't measure it just now. Apologies to those who've already contributed based on it being 40L! Edit: I've added this later in the thread, but to avoid confusion here, the volume of the cab is 42 litres minus the driver itself

Thanks Phil. Yeah, I am almost enjoying the experience of finding myself wrestling with the trade-offs. Its a good learning process for sure. HPF is definitely part of the solution for the cab, whether sealed or vented as excursion is a problem either way. One thing I noticed was that the driver has QTS of 0.33, pretty low for a sealed cab?? Might explain why there is so little bottom end. Maybe replacing the driver would be a better idea. This is the driver:

Thanks for you input Bill. I'll check when I'm back home. It has Xmax of 4mm, so its not too bad in that department.

Thanks @agedhorse, kind of reassuring to know that "it's not me, it's the box"! If I go up to 10cm diameter it needs to be about 20cm long to maintain the tuning, and this brings the port speed down quite a bit. That is longer than I 'imagined' it being, but you're (of course) right that it would do a lot to reduce the problem. The cab is about 30cm deep, so assuming I can find a 10x20 port - or make one - and that it fits the baffle, this should work. On the other hand ... maybe this is why they made it a sealed cab! Much appreciated.

Any input much appreciated on this one folks... I am toying with the idea of adding a port to a sealed cab, mainly to get some more bottom-end but also as a bit of a learning project. I am modelling it in WinISD and can't seem to arrive at a port config that works. Can anyone help? Box size: 41 Litres Driver: 1 x 10inch SICA (I know, never going to sound huge... but it is what I have got to work with on this project). The puzzle: I set the port diameter at something sensible like 7.5cm which seems okay in that it will fit on the baffle, is about the diameter of a lot of other ports, and I can buy a ready made port of this diameter from Blue Aran. Doesn't strike me as an unusual choice. This all looks ok, WinISD tells me it should be a reasonable length to achieve the tuning I am modelling (for 45hz the 7.5cm port should be cut to 10.4cm). All good. The issue comes when I look at the air velocity charts for the port. It says air velocity down at the tuning frequency will be over 100ft per second with a 100w signal. That speed is more than twice what google tells me I should aim for. My questions: Am I missing or mis-understanding something? Probably. Is it a non issue because there is rarely much power in those low frequencies? What is normally done to resolve what looks to be a basic tension between the competing priorities of wanting a port of about this size (most cab designs don't permit enormous ports), of practical length (can't have one longer than the depth of the cab!) and with air velocity that doesn't get into 'chuffing' territory? For now I'll keep reading and modelling and trying to work it out. I am not going to reach for the hole-cutter and ask questions afterwards - as I have been known to do in previous 'projects'!. Thanks in advance, Doug.

Mike recently bought an amp from me. 'Twas a smooth and easy transaction. You can be 100% confident in dealing with him.

By 'one input' do you mean the head has one speakon connection on the back (output), which is the case on the head you mentioned? Don't let that sway your thinking. You can daisy chain cabs using the two sockets you'll find on the back of any cab. You aren't limited to a one cab solution ... Unless you want one of course! For what it is worth, my own take on this, especially where minimal weight is a "doctor's orders" kind of thing, is that I'd prefer to do two easy trips from the car than one awkward one. Larger cabs, including many 2x12s are great, and not always very heavy, but that doesn't make them easy to move from a car through doors, stairs and corners to your spot next to the drummer! Modular is the way. Good luck and good health Dave.

Can I send you the bill for the amp I just bought @TheGreek ? Seems like it's the least you could do ... I clicked your link, and within minutes I'd found and bought a totally different amp on Gumtree. 🤦‍♂️

Glad you got the stents before things got any worse dude. I'm about to list 2 Fender Rumble 112 cabs. They're light, good handles which make for an easy lift and they do go loud. Pm if interested and apologies if this is an infraction of any rules!

no worries ... and no need to apologise mate, it's not like I'm paying you! Anything you can share - whenever you can - is appreciated.

Thanks, this would be great. I'm trying to get my head around crossovers so would really appreciate seeing this.

Very nice, but too large a box for me. Slightly off topic but does anyone know of a UK based cab Builder who would make a custom BFM cab or two? I know there's a guy listed on Bill's site but he doesn't seem to be active, on email at least.

Not yet but am considering an airhead combo like yours @JohnDaBass, it's a great idea. Not sure about the crossover though. Would be interested to know what this one is doing and what scope there is to improve on it as I think Stevie suggested.