stevie

[quote name='JTUK' timestamp='1450286056' post='2931391'] Fair point...but my introduction to NEO's was when I put 2510 deltalites in my Goliath Jnr box...and hated them. I'd looked around to see whether this conversion was common as PAS speakers were like gold dust in the U.K and no one had recone kits either. The conversion WAS common and people said they loved it.... well, I liked the weight save, but sold the boxes asap. So, the box was a decent SWR box..albeit maybe not tuned optimally for the NEO chassis but it wasn't the volume] that was the problem, it w as the sound. Anyway... it wasn't until I used Markbass with NEO that I got the idea that NEO wasn't working....and then onto all the others and same thought that these boxes weren't really happening for my ears. The only NEO cabs I got reasonable comments on were Berg AE112's . [/quote] It's a shame your introduction to neo was with a mediocre chassis. I don't doubt your experience for a minute, but I know of no evidence anywhere that would lead me to believe that neodymium sounds any different to ceramic. There are some driver manufacturers making equivalent products in neo and ceramic and professional buyers make their choice for reasons of weight and price, but not on sound. So my thinking is that the difference lies elsewhere, and cabinet construction does make a noticeable difference to sound quality. When you listen to a speaker with no cabinet (like a Quad Electrostatic or an open baffle), it's quite amazing how much the cabinet does actually contribute.

Could be this: https://www.bax-shop.co.uk/flight-case-wheels/penn-elcom-w2001-50mm-recessed-caster-black Or this: http://www.adamhall.com/en/Adam_Hall_Hardware_3783_-_Recessed_Edge_Castor_58_mm_in_plastic_Housing.html Difficult to tell from the picture, but as t-h says, it looks like a fairly standard part and is probably not exclusive to Genz.

[quote name='JTUK' timestamp='1450272333' post='2931218'] I have to say, I've never really been sold on any NEO cabs I tried. Doesn't mean I didn't use them at the time...just knew something wasn't quite right. I could list them as there are a good few... but not one did I like. Draw your own conclusions but the one common element was NEO. That is why I feel I can say I don't like NEO. Whether that might change at some point in the future when I hear one, is a maybe. [/quote] The other common element that you may not have considered is that cab manufacturers who use neo speakers always put them in lightweight boxes. There might be one, but I don't know of any commercial neo cab that hasn't got a thinwall or balsawood-type box. I'd like to suggest that what you heard was not so much the sound of neo but rather the sound of insubstantial cabinet walls vibrating. Just a thought.

It was indeed very silly - but I just did what you did. Wasn't your point that modern cars handle better than 1973 cars (thus demonstrating in some weird way that modern bass cabs are therefore better than older ones)? Otherwise, why bring it up?

[quote name='brensabre79' timestamp='1450268843' post='2931159'] Honestly, it's like saying modern cars with their new fangled gadgets don't handle as well as a 1973 Austin 1100 on the country lanes. [/quote] Or that a 1973 Aston Martin V8 could outperform a 2015 VW Up! What a silly idea indeed!

Martin bought an Eminence speaker from me and everything went like clockwork. Thanks!

Quality!

I'd seriously think about whether the problem might actually be the pickup. I was not impressed when I tried it. The SPB-1 on the other hand......

Lots of chordal things going on here. A fun tune to play (but a lot easier if you can read dots). [url="https://youtu.be/iZRA-Dwv86E"]https://youtu.be/iZRA-Dwv86E[/url]

Alberto just bought a power amp from me. He's a great guy to do business with. Don't hesitate!

I think that is quite likely to be the case.

Another benefit that occurs to me of going with rounded ports is that altering the cabinet volume becomes a lot easier than with a slot port. It should be a fairly simple job to recalculate the port lengths for a (slightly) smaller box using the usual free software.

On the matter of cutting the holes for the port tubes, I bought an adjustable hole cutter recently for less than a fiver which may not be the last word in pro tools, but will do the job perfectly well. It might take a few tries on some scrap pieces of wood to get the size spot-on, but it's not too difficult to do. http://www.ebay.co.uk/itm/Handy-Adjustable-Metal-Hole-Saw-Round-Circle-Cutter-DIY-Tools-Accessory-/252069704389

I agree with the standing wave explanation. The addition of the slot port makes the internal vertical and horizontal dimensions fairly similar, which will further reinforce the standing wave which, as tauzero points out, is at the frequency you would expect from those dimensions. As we don't have this problem with the round port version, I'd suggest that we follow Luke's pragmatic approach. Another benefit of the round port option is that a tweeter could easily be substituted for one of the ports if desired - either straight away or at a later date.

VERY nice work! Thanks.

If you want a rough guideline, using neo magnets will cut the weight of a speaker by around 50%. You'll save more on heavier, more powerful speakers (10kg down to around 4kg for an equivalent driver) and less on more modest drivers. 4.5kg down to 2.5kg, for example. My neo speaker weighs 3.7kg and the manufacturer produces a direct ceramic equivalent weighing 9kg.

You wouldn't happen to have any more of these, would you?

Excellent effort - I really enjoyed that. The singer fits in really well.

Have just done a swap + cash deal with Roberto for my Markbass LMIII. The deal was concluded quickly, with no messing and we both sent our respective amps off the next day. Roberto was a pleasure to deal with and I can only apologise that my amp arrived a day or so after his. Deal with confidence!