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Phil Starr

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    Chard,Somerset

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  1. that looks great, I should have gone for the silver corners.
  2. Hmm bathrooms are a good place for stinky poo
  3. What we are trying to do is to introduce people to all sorts of ways of building cabs and encouraging them to experiment. At the same time we want to offer designs that will be satisfying to own and will work first time. We're also trying to give enough information that people can do their own adaptations. If somebody wanted to there is no reason not to build the 50l MK3 cab with the drivers and crossover Stevie designed but using the 'easy build' technique. Or you could build the cab we are discussing here with a circumference brace borrowed from the MK3, or indeed a rear port. If you keep the overall volume and the port dimensions the same you preserve the tuning so if you wanted a taller cab or one that matched your amp dimensions that's all possible. Everything we do on here is creative commons, we're happy for people to build the cabs for their own use or to build one for a friend so long as it is done on a not for profit basis. If anyone wants to put together a small run of CNC flat pack kits for BassChatters on a not for profit basis that's good too from my point of view. I'm not sure what the next project will be, I've got all sorts of plans but I need to clear some of my stinky poo out of the house to make some space. I'm also being reminded I have to fit a new bathroom
  4. I've just spent the day playing through my RCF ART310s on poles they do just what you want, they sound like huge headphones. Nothing in the chain other than the mixer.
  5. Back on track, thanks for this John, it's really useful to have an independent personal opinion. I have to say that this pretty much matches my own experience. I also rolled off the bass a tad and found the cab perfectly adequate for rehearsals. the basic sound is just a lovely open honest sound of the bass but I also added a little compression (and grit also). The band loved it. I'd also pretty much agree with the assessment of it's capabilities, 100+ would be beyond it as would anything outdoors. You'll find when you have two for PA it will sound a lot better than the single speaker. I do a lot of critical listening when testing speakers and listening in mono often shows up things you don't notice with a stereo pair and of course the imaging will do so much to the experience. This little speaker has given me a little doubt as to what I'm doing next. I've got the parts to build the 12" BC Mark3. I've been using bits and bobs of prototypes I've been taking to gigs for years and I wanted to have a go-to set up for important gigs. I've been using a couple of Beyma 12 based BC Mark1's for years. This BC 110T is so much better than it has a right to be and is so portable I'm now thinking of just having a second. Then I'll have two speakers I just won't touch for gigs and I can experiment freely with whatever else I have. For £125 and less than a days work it's tempting. Just a question of which one to build next.
  6. Honestly I doubt that they do sound better, I can think of at least one good reason why they ought to sound worse but none which would make them sound better. There is no theoretical reason i know of that would suggest a difference and i doubt you'd measure any difference at a decent distance from the cab. You are then down to subjectivity/listening tests. The problem is proving a difference one way or the other. You'd need to build identical cabs with identical drivers and then carry out multiple double blind tests where neither the listener nor the operator knew which cab was which. The big problem is that our ears are connected to a big organic computer which processes the input from our ears and often functions to make us hear what we expect to hear. I've spent many hours doing listening tests when designing and building speakers and you'd be amazed how often you can fool yourself that you can hear something that isn't there or fail to spot something that is obvious. My wife assures me that i often fail to hear things which are important to her but rarely miss something important to me It isn't just our sight that is subject to illusions. To me ports on the back look wrong and I tend to avoid them even though I know there is no good reason to do this. The reality is that I've never actually listened to the same driver in a box identical except for the port placement. Maybe you just prefer some speakers to others and as not many have ports on the back it's just coincidence that you didn't like those as much as your favourite cabs So what could make it sound different but objectively worse? Firstly cutting a hole in the baffle weakens the part of the cab you have already weakened with the speaker cut out and the bit you need to be most rigid, you end up with a big heavy magnet fixed to a wobbly board. A weak baffle isn't good secondly the port itself has a series of resonances where the wavelength is a multiple of the port length. These are going to be more directional and could be audible.
  7. If you don't mind building one of these would be ideal We've been looking at a lot of bass speakers and the crossovers are rarely done with a lot of care so that's probably what you are hearing. If you want to buy then it's probably best to skip bass amps most of which are 'voiced' in some way and go for a PA speaker. I use my RCF ART310's sometimes and they work well with bass up to quite a reasonable volume. Depends upon what your budget is of course.
  8. Brilliant, I think this will be ideal for you.
  9. Hi Bert, I would have thought it would be great for what you need. I designed it to cut the low bass and emphasize the upper bass/low mids. I think it would certainly do the Motown sounds quite well. However I'm not the words greatest tone freak or the best musician in the world (by quite a distance). I notice you are in Somerset so maybe you should come over and have a try sometime. I live just the other side of Chard
  10. Before you start this think about what you are trying to achieve. Is this to repair a cab which seems to be damaged or a restoration of something you love? Maybe you want to upgrade it? The thing is that there is only one way of making this like new and that is replacing the original drivers. There are probably a lot of substitutes that will work perfectly well in your cab but they will all sound different from the original drivers. For some it might ba a subtle difference and for others it could be dramatically different. WinISD is about the bass response and it is quite possible to get something close to the response you currently have but the response of speakers at the top end varies a lot and the computer modelling wont help there. This cab has a tweeter and crossover and that complicates the matching process. The moment you change the speakers you don't have an Aggy you have a box with different speakers and a different sound that looks like an Aggy. It could sound better or worse of course. The first thing is to say is that speakers don't usually rattle when they are ****ed. Rattle sounds like something is loose in the cab. Maybe the speakers aren't properly tightened down any more or a joint has broken which could be re-glued. Maybe a lead has come loose and is rattling against the speaker? We can talk you through trying to fix it if you want? The original speakers might be expensive but if you only have to replace a couple might be cheaper than four new ones. Four Eminence Deltas would set you back £360 for example. You can get European made speakers cheaper but not by much if you want good quality. Generally speaking it's as cheap or cheaper to trade in a cab and buy a used cab than to do a speaker swap, changing speakers is likely to reduce the value of your cab over keeping it original so long as it is in good working order. If you just fancy a project then that is great, we can talk about what you are trying to achieve and try and find something to suit. I'd try and fix the cab first though.
  11. Shut up and.... no I can't be so rude There are a few Beymas that are really good value, the CMV range are across the board good value. It's a shame they stopped making the SM212 though. In this case the choice of the Celestion Pulse was a good one mainly because of it's mid-range performance. Most bass/mid speakers have a pronounced peak at cone break up. At high frequencies the out part of the cone can't keep up with the centre and the cone starts to flex and this creates frequency anomalies. For a 10 the response is fairly flat and rolls off evenly and this makes adding a horn driven through a simple high pass filter relatively simple. To get a flat response from most bass/mids you need to have a 'proper' crossover and control the roll off for the bass unit. The inductors for this tend to be large and relatively expensive and beyond that you often get other frequency problems which need extra components and design work to tame. You'd be amazed at the manufacturers who don't bother doing more than a cursory job on their crossovers. It's probably why some bassists don't like horns; there's nothing wrong with the horn but the crossover leaves little frequency peaks that sound harsh/distorted/honky. So Win ISD models the bass response and you may well find better 10's but the Pulse was chosen because it gave good enough bass but a really helpful treble that enabled a good response with just three cheap components in the crossover.
  12. Hi Al, As ever mine was just a factual post. There was a study and both in terms of economics and Live music performances Australia has done way better than us. That is still true. The rate of vaccination in Australia is poor for a wealthy country and frankly the worlds media coverage of Astra Zeneca hasn't helped, taking aspirin or paracetomol is far more dangerous and my guess is most anti-vaxers pop pills with a lot less caution than I do. Getting one bit of the equation right doesn't stop you making other mistakes. I note that the governments science advisors including SAGE members have a model that is predicting another 50,000 people killed by Covid in the next 12 months as a median figure due to the current relaxations. They clearly see this as acceptable. That's of course not including other cancelled treatments due to Covid bed blocking. The NHS is already starting to turn people away from some hospitals. I note also that the trials of opening night clubs and other indoor events have resulted in over a third of the participants contracting covid and that was the Alpha strain. Indoor events are pretty much super-spreader events. Outdoor ones much safer Further I am concerned that letting Delta rip through a population where around 1/3 of the population is unproteced is, according to DR Phillip Hammond "the prefect petri dish for breeding vaccine resistance." Of course vaccine resistance means the virus is also bypassing natural immunity. Vaccines only work by triggering our natural immune system. There are a number of coronavirus genes out there we wouldn't want to meet with Delta. Viruses swap genetic material if you have co-infection. Co infection becomes common with something as infectious as Delta. One of the genes we know is out there, as reported in New Scientist, would make Covid 100 times more infectious than Alpha. Others out there would make it more deadly than Delta. There is no predicting random comings together but when the improbable looks so bad it is better to avoid the random. I'm sure the migration of lemmings is also a glorious sight, I know how it ends!
  13. I think that's all fair comment, though I only built the cab @stevie did the tuning and he did this on the basis of measurement of the final cabs response. The original design was shaped by the need to keep everything easy to build and the availability in the UK of a ready made port was an important factor. We were looking for something cheap, easy to obtain and sourced from a well established supplier so likely to be available for a few years. This one also has a decent lip to cover up any dodgy cutting of the hole. When I did the modelling on WinISD I found my 'best' response was higher than the final tuning and that the original port without the addition of extra length would give that tuning. The extra card extension was added as a result of frequency tests on a built prototype. The frequency plots are there in the text somewhere. In my original version of the cab I used plastic guttering down pipe. One of the things we discovered testing is that two narrow ports start to make port noises (chuffing) at lower power levels than a single bigger port with the same cross sectional area. We hadn't seen this in any literature. Like @agedhorse I shudder at the idea of folded ports. Like all the commercial designs we have looked at and pretty much any practical cab there are compromises in this design. Like the crossover design and choice of drivers the port was an issue of cost and availability. Actually 52Hz sounds about right, I measured 53Hz by looking at impedance on mine. I don't think it is worth re-tuning unless Steve comes along and says there is a problem, my cab sounds great given the cost of the components and pretty much as i'd have expected from the design software.
  14. Get a couple of coats of Tuff Coat on it and it will look the business. You've done a good job with that and I really hope you get a lot of happy hours using it. I think you are right about the volume, WinISD shows a broad band output of about 118dB at 200W which is fairly typical for a 10" speaker. Adding a second would give you 123-4dB depending upon the amp which puts you well into the gigging range. It would work well with an untweetered Pulse10 in the same sized cab underneath if you wanted to save a little money. In terms of practicality I use mine as my go to for rehearsals. I like it for gigs too because I have PA support so it is just a monitor and is plenty loud enough for me to hear everything and it sounds good. The sound engineer loves it because it's not overwhelming the vocal mics and my drummer is not so keen because he likes to 'feel' the bass. I don't think building it in 12mm ply would give you any advantages other than weight saving and maybe a better quality ply would be tougher and easier to finish. Have you weighed the cab? Mine came out at dead on 10kg. Thanks for the review, it really helps anyone thinking of a build having an opinion from someone unconnected with the design. Well done Phil
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