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alexclaber
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  • 2 weeks later...

On another subject altogether, I have just designed a hi-fi speaker from scratch! :)

It features a coaxial 7" midbass/tweeter (3kHz crossover point) in a sealed cab, Q=0.707, with an 8" woofer (200Hz crossover) in a large ported cab tuned to 30Hz. Response +/- 1.5dB from 40-6000Hz, +/-3dB from 30-20000Hz, and can manage 100dB output from 30Hz upwards.

The reason behind the unusual design is to get the big clean bass output of a large floorstander without the need for a separate subwoofer but the coherent nearfield response of a coax design and in the process get very low distortion midrange and treble by minimising excursion of the midbass speaker (which also acts a waveguide for the tweeter). It's also designed for near-wall placement so large non-rectangular baffle and no baffle-step correction.

The crossover is hellishly complicated - six inductors, eight capacitors and six resistors per speaker (and that's assuming I can get correct values and won't have to use multiple components for certain values). Fortunately the impedance curves look ok to drive - phase doesn't get too weird and magnitude stays above 4 ohms.

Alex

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  • 2 weeks later...

[quote name='RIM Basses' post='263583' date='Aug 16 2008, 01:21 PM']Great to see you are doing well with the cabs bud, looks like you might be busy.[/quote]

They do take a while to build! I have four of The Compacts in various stages of progress and the first of The Big Ones on its way. However I am getting more efficient so hopefully I'll be able to make a few a month. I'll be bringing one of each model to the SE Bass Bash.

Alex

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  • 3 weeks later...

[quote name='silverfoxnik' post='334319' date='Nov 22 2008, 11:44 AM']Just had a look at your website Alex; brilliant work! So when are you moving into amp design & manufacture then? :huh:[/quote]

2010 :huh:

This is all rather snowballing but I guess that isn't such a bad thing! Just finished The Big One #1. I like this cab very very much, looking forward to getting it up to war volume in the band. I think it's big enough to justify some wheels so some mods to come for that but otherwise it's sorted! :)

Alex

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[quote name='alexclaber' post='334557' date='Nov 22 2008, 06:51 PM']





I'm pretty confident it's come in at the target weight of 45lbs - it's a little heavier than my rack which contains a PLX 3002 (21lbs), Avalon U5 (7lbs plus rack ears) and is a Gator 4U shallow (~10lbs).

Alex[/quote]
Looks great Alex! Congratulations - you must be really pleased with it... :)

When can those of us who are relatively local to you get a chance to hear it??

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[quote name='silverfoxnik' post='335159' date='Nov 23 2008, 09:24 PM']When can those of us who are relatively local to you get a chance to hear it??[/quote]

Well I'm not gigging at the moment, band having a hiatus because I'm so busy with the cabs. Who wants to borrow it and give a real workout?

Alex

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It could do with a badge of some sort, or some little bit of colour on it somewhere - just to give it a little visual impact other than black box with grille and to mark it out as not "just" a really nicely done homemade job.

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[quote name='Merton' post='336281' date='Nov 25 2008, 02:49 PM']Hey Alex, bring it up to Redhill next weekend and I'll give it a run thru at my next wedding gig.... I may forget to give it back though :)[/quote]

I do have a meeting in your neck of the woods next week! Seriously, if you want me to drop it off with you at work/home I think that could be arranged. I'd like as many people to try this cab as possible - be good to get the feedback and also help me make my final handle/wheels decisions.

Alex

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[quote name='alexclaber' post='336467' date='Nov 25 2008, 05:26 PM']....I'd like as many people to try this cab as possible - be good to get the feedback and also help me make my final handle/wheels decisions....[/quote]
Feedback suggestions:
1. Don't skimp on the hardware.
2. Provide good covers.
3. Use good wheels, swivel castors, the 2 at the front with brakes and preferably 3".
4. Don't go for this one handed lift [email protected]! 45 lbs is NOT a one handed lift for a lot of people. Even with good wheels we still need to lift the cab for stairs, loading the van, door steps etc. Two handles please.

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Hi Alex

After Merton has blown it to bits, can I try the shrapnel? I had to leave the SE Bass Bash before I had chance to abuse it. I've just bought a BFM Omni15 Tallboy from David Perry and am interested to do an A/B.

After I'm done I can deliver it to the next abuser within spitting distance of me........ I can spit 10 miles or so from M.25 Junction 11. (Mug of tea on delivery please)

Cheers

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