Stub Mandrel

This is the beast: http://www.bluearan.co.uk/index.php?id=EMILEGBP102&browsemode=category I didn't think of going to Eminence, using the proper name: https://www.eminence.com/pdf/Legend_BP102.pdf

Would it make a significant difference if I dowelled the boards together so I could leave out the battens to save weight?

Thanks, Phil!

Wait! - are these the dimensions for the easy build 10"? They were in black on dark grey and hard to read* so first time I just assumed they were more text... What are the port dimensions for the 10" version? the panels for the cab are 2x 374mmx290mm, 2 450mmx 290mm and 2 450mmx350mm (all 12mm ply) the front baffle is set back 30mm to allow for the grille so internally the cab is 350mmx450mmx236mm. the ports are made of drainpipe/downpipe which is 64mm internal diameter 160mm long *Yellow on blue is the most legible colour combination, if not the most pleasant.

I don't see the cab dimensions anywhere, just that it is the same s th2 12" Easy build, but I went tro taht thread and there no easily found link to the dimensions of that either. I do wish people would edit the first post to include a download of the dimensions 🙂

Ahh.... it's reappeared:

I'd have ago at a design but WinISD keeps coming up with strange results, like a cabinet of over a million litres! That's what it suggests for an Eminenece 102 for a vented enclosure and default chebeshev design. ... ah just tried again and It's come up with a 16.5 litre box, but the curve -3dB point is about 110Hz - this is a speaker with a resonance of 35Hz claimed to work down to 40Hz. What is going on? Edit - I was choosing B102 instead of Legend BP102. Now the -3dB point is at 42Hz and the volume is 106 litres which looks a little big but potentially doable. 10cm x 10cm x10cm is a litre = 1 cubic decimetre. 5^3 is 125. so a 50cm cube would be 125litres, so if using thos external dimensions and 13mm ply... Internal volume would be 4.74^3 = 106.4 litres A 50cm cube with the front inset 1cm would be about 105 litres. WinISD suggests a vent 10cm x 9.03cm long. Any skilled WinISD joockeys want to check these figures or suggest a better driver*? *Particularly one happy in a smaller box.

Funnily enough, I'm considering a TE Elf as a backup amp. The logical next step is a decent, compact 10" cab or a 2x8" or even 1x8" for practice and maybe things like backing acoustic folk, but capable of coping with the 120W of the Elf (into 8 ohms). The TE 2x8 is pointless - it weighs as much as my 2x12. And teh 1x10 is expensive enough to make a home build appealing - I like making such things. So I, too, tried finding an EASY 10" CAB BUILD thread this morning. Haven't got further than browsing Eminence and Beyma drivers.

Err...

I will bring a rear ported cab to the Midlands Bass Bash. People can decide if it's inadequate for themselves 🙂

First thing discussed when joining new bands. No embarrassment, perhaps because we are all jabbed.

I can't see the wall...

After a week of frustration waiting for a Bass Terror, I cancelled and ordered from PMT and got next day delivery. So now I have a Bass Terror sitting on top of a GR Bass AT212 slim cab. Modern tech and vintage sound 🙂 For those who are unfamiliar with the Bass Terror, it's a 500W RMS class D amp with a twin valve (12AX7 and 12AT7) preamp designed to sounds like the Orange AH200 all-valve bass head.. The 'unclean' setting gives a lovely classic Orange growl which is exactly the sound I wanted to get, ideal for the blues rock 'power trio'. The clean setting seems to be what it says and should allow me to get the range of sounds I need for the covers band using my pedalboard. Is it loud enough? Well, I've got the master volume at absolute minimum AND the 6dB pad switched in with a passive bass, and it's still a bit too loud for bedroom practice. Quarter volume sounds loud enough for band practice, and that's with the 6dB pad still switched in. I did consider the Little Bass Thing (which seems to be a basschat favourite) but I'd swap having a proper gain control and the very convincing sound of a two-valve preamp for valve compression any day. Came with a lovely padded bag (big embroidered Oraneg logo) with shoulder strap etc. The only downside is that it feels a lot heavier than 4.6kg/10lbs, possibly because it is so compact. My prediction was that this would be the dog's danglies, and it seems to be delivering.

Is it true he once stood in on bass for Steel Pulse? Alfie Noakes is better than no dread. ... I'll get my coat.

Cripes, very different in my day when originals bands played pubs!

With proper design the port signal is in phase. WP explains better than me: The small additional delay for the rear port might actually bring the signal even closer into phase reducing the 'smearing' described above.

Much as I love the 'Basses on the Settee' topic, it's not really the best way to show off most basses 🙂 During the heatwave (remember when it wasn't raining?) an entire wall I'd covered with two layers of lining paper peeled off down to te dado rail, held on only by the guitar hangers. Well, I realised if I put a hanger back up before redecorating, I had a lovely arty but neutral background to photograph some basses. So here are seven of my babies (not including headless or my too-long acoustic), in order of approximate age: Mid-70s Maya Fretless (MIJ): 1985 Fender Performer (MIJ): Circa 1985 Westone Thunder 1 (MIJ): 2002 Squier Jazz Bass (Indonesia): 2018/9 Squier Jaguar Short Scale (Indonesia): 2019 Fender Flea Signature Jazz (Reliced '63, Mexico): Deathburger (from Harley Benton Kit, only body, neck and part of loom original, light relic) 2020, (UK):

That looks excellent. Once I have my workshop gear back I have everything needed to do that!

As the design in this thread seems to have been 'finalised', is it too far off-topic if I ask a question? I have two sets of elderly but still very usable 12" speakers (nominally 80W IIRC) that I haven't been able to get Theile Small parameters for. I used to use them as part of my rig in 2x12 cabs (one sealed, one with experimentally added and tuned ports). Is there a way of estimating the most important theile-small parameters? Enough to make a pair of workable 1x12 monitors, including a reasonable stab at a sensible crossover frequency and tweeter. I assume you can measure resonant frequency, Fs, just by tapping it gently while connected to an oscilloscope.

The wavelength of a 40Hz audio signal is 330m / 40 = 8.25m. In other words, at the frequencies porting enhances (let's say sub 100Hz) the distance from front to back of the cabinet is only a small proportion of a wavelength, insufficient to cause destructive interference and hence beaming or phase issues and the cab is essentially omnidirectional at these frequencies.

I got an audition for an originals band. Spent the week learning the basslines for four recordings (Including a Country Chart number 1) note perfect. Then cancelled at last minute for 'family reasons'. Weeks later got the 'we found someone already' message 😒 But, to be honest, I think it's important to learn the originals, especially if the songs have been recorded. This is what I did when I joined an originals band in about '93. The payback was creative freedom after that point. Exception might be genres (like blues rock) where a bass player is expected to use a fair bit of improvisation/creativity live.

How many people here have actually A/B tested otherwise identical cabs with front and rear porting? Other than @Bill Fitzmaurice...