Balcro

[i][b]Voxpop: "This is exactly the sound of my cab, very old school with a big hump around 100hz. It's not bad at producing a good stage sound but sometimes the hump can interfere with the room, that why I block up the holes / ports."[/b][/i] By sticking the foam in the hole you may have created a happy accident that cleans up the sound. Some early audio pioneers did the same in the fifties. The result is a restricted "port" through which the speaker breathes. Basically the restriction smoothed out the hump/boost in the response linked to an ordinary port (with a tube) and theoretically gave you a little more extended bass. Balcro.

[quote name='voxpop' timestamp='1353316061' post='1873435'] I have a cab the contains a Celestion BL15-400X driver. The cab has two 7cm holes cut into the front of the cab. To my ears it sounds better with the holes blocked with foam. It gets tighter and more dynamic. Why cut the holes into the front as it is clearly not tuned to any frequency as there is no tubes behind them. Seems to me it's a crazy design, or maybe there is no design or thought put into it. Just put a driver into a box, cut to holes and charge a fortune. [/quote] Has the foam been stuffed into the holes or has a piece of foam been properly cut to fit and set into the hole? Balcro.

[quote name='apa' timestamp='1349442689' post='1826396'] They dont fit I bought some and they are about 1/2" to 1" too short for my 38 1/2" needs. A [/quote] This is really annoying isn't it. So it looks like jaydentaku's recommendation is the best off-the-shelf option, apart from a custom length string. By the way have you seen walbassist's veilette on youtube. Beautiful bass. http://www.youtube.com/watch?v=--yDD_5erxs Balcro.

With his colleague Richard Small he made a huge contribution to audio engineering physics. As long as moving coil loudspeakers exist, there will be Thiele/Small parameters. Formal honours richly deserved. RIP. Balcro.

G' morning guys, I came across this address last night - http://www.rotosound.com/string_guide.php It explains for me the meaning of "speaking length" and scale length. There seems to be an all round limited range of very long strings, but presumably Rotosound do something in "extra long scale". D'addario do half-rounds in "Super long scale" which also seem to fit the bill. GHS do Precision Flats suitable for a 36" scale length but don't confirm that this would translate into a speaking length of 38.5", as per the Rotosound example. Balcro.

This is beginning to ring the odd bell. See also the current thread about EXL Reds in "Miscellaneous Equipment & Accessories". If I remember correctly, with d'Addario you have to buy the [u]extra long scale[/u] strings to work on many basses. That should prevent the taper section from resting on the nut. Their scale measurements aren't in line many other manufacturers. Check with their web-site. Balcro.

[quote name='D.I. Joe' timestamp='1348845410' post='1819070'] I've been thinking about trying these. Who is supplying them? [/quote] Somebody must be wholesaling them, because I simply e-mailed the info line at stringbusters, and the "Brite Flats" I was after were delivered in 5 days. Just because they're not listed on the web-site, doesn't seem to mean that they can't quickly get product. Balcro.

A speaker, a port and an enclosure are one system. If you randomly change one or another, then you will have an effect. It could be a boomier effect and initially sound different, but whether that's an improvement is doubtful. The chances are, you'll dramatically reduce the power handling of the speaker drive unit in the very low bass, rendering it potentially more susceptible to damage. To maintain control you would need to lengthen the port as you widen it. But without knowing the physical paramenters of the existing loudspeaker and running the modelling software you won't get the balance right. Back to square one. Balcro.

I was given one a few years ago. Amusing as a toy, but whether it's really got any medical benefits I can't say. I hurt my forearm/hand indulging in 10 pin bowling with the grandson a few years ago. It took 9 months to heal. I tried the powerball for 5 minutes after about 4 months into the recovery. It seemed to free up the stiffness in the wrist in an odd sort of way. After that I tried it about once a month for the next 3 months with no ill effects. So overall it might help in a subtle way, but like a lot of things don't use it to excess. Balcro

Hello apa, Just had a look on the ghsstrings web-site. They do a five string version of the Pressurewound strings - ref: M7200-5, and a a 5 string set of "Precision Flats" - ref: M3050-5. They claim that these are "long scale plus" and will fit up to a 36" scale bass. That looks to be the answer, Unfortunately not available in Brite Flat. Oddly, no five string sets for the Brite Flats. My set is coded ML3075 and is for a 4-string and is described as standard long scale for 34" basses. Balcro.

My long scale "Brite Flats" - straight out of the packet, so unstretched, have a measurement 37.75" (95.8cm) from the underside of the ball to the start of the ribbon. However, the ribbon over the thick part of the string extends to just over 38.75" (98.6cm). After that there's a step down to narrower section of silk covered string that's about 11mm long. I got mine from "stringbusters". Although not shown on the web-site, they were able to get the Brite Flats to me in 5 days. Make an e-mail enquiry to [email protected] Balcro.

After having another look at the figures, I'd agree with other posters. In general with two 4" (200mm) ports it will be fine. If however you're going to regularly give it lots of "welly" and put over 150 watts into it (good for 115 decibels- deafeningly loud), there is always the option to make the ports wider. With ports 12.5cm in diameter, you could still use two and never notice any port noise. Come to think of it at that sound level you probably wont be able to hear the port noise! Anyway, lets get those accurate measurements onto the forum and we can give you the best possible advice. Until then, don't cut or drill anything. Balcro.

Strange that you should mention drain-pipe....... Assuming that neither enclosure has any internal panel-to-panel or cross-bracing, here are my findings:- With the Ashdown cab you'll need to do some work. As it is, with those ports you'll get a steady roll-off in the bass below 150Hz and a large amount of port noise. However, power handling at any point will exceed 325 Watts. If you open out the the rear ports to about 10.0cm and add an additional third port the same size. Then you need to have a port length of (Edit - about 280mm). Plastic drainpipe cut to length should be OK. With the Warwick, as I said before, the advantage is the greater number of ports. But, the enclosure is oversized and it shows in the potential power handling. Way down at 260 Watts, with the potential for the back & forth cone excursion (xmax) to exceed it's limit at about 38Hz! So full whack on the amp plus low "B" and using an octaver could be ..er undesirable. If the enclosures do have extra internal bracing that you can't see at the moment, then there will need to be a quick recalculation. [u]This will also be needed once you accurately measure the internal dimensions and account for three longer ports.[/u] My advice would be to go with the Ashdown, but you'll have to accept the lack of very deep bass extension. Balcro.

[quote name='Geek99' timestamp='1347888342' post='1806152'] I'm not sure where I am in the list [/quote] See Post #50 Balcro

[quote name='Phil Starr' timestamp='1347890985' post='1806196'] If you can give us the internal dimensions of the cabs you have and the sizes of the ports then we will calculate the sizes of the new ports for you. The Mag looks to be about 100l and the Warwick 150ish so either will be possibilities. You should end up with a good sounding speaker. Phil. [/quote] Ha! It looks like we're working in parallel. I've done the same calculations and get volumes of 90-95 litres for the Ashdown and about 150-155 for the Warwick. The advantage for the Warwick, if I assume correctly, is the existence of 4 ports. That might save on the woodwork. This driver does seem to like a lot of ventilation in order to keep the port noise down! Balcro.

[quote name='skidder652003' timestamp='1347728336' post='1804416'] thanks Bill im not going to find anybody round here with the time or inclination TBH! Ive ordered the kappalite 3015LF and im gonna bung it my old ashdown 115 deep mag cab or my warwick wca 115 and hope for the best! Trial and error on this one im afraid! [/quote] Actually on this forum you would have done. Patience, patience. I assume you've checked out the following page. [url="http://www.eminence.com/pdf/Kappalite_3015LF.pdf"]http://www.eminence....lite_3015LF.pdf[/url] So to the basics - you want an enclosure between 99 and 195 litres. Work out the internal volume of both the boxes and select the one that's the best fit in terms of volume. Then I can tell you what woodwork you need to carry out. Balcro.

All being well and post permitting, the book should now be with "tauzero". Balcro.

Okay, let's have another try. No responses from munkonthehill or crag42. Mickeyboro tells me he's read it elsewhere since this started, so now it looks like tauzero's turn. PM to tauzero. Balcro.

Hi Dood, http://www.avonply.co.uk/Stocks.aspx 2500mm x 1220 x 15. -- £52.73 + Vat. Balcro

ALL the replies have just proved you're a lot better than you think you are. Your very smooth style complements the song. I wish I could keep my fretting hand as easy and controlled as you do. Well done. Get up sausage! Well look at you girl. High fives! Balcro.

Here are some other options. Copy them into you address slot.. The GHS flats range comparison - http://www.youtube.com/watch?v=PE5R3rUoU58 and, a variety of string and bass sounds at a click. Scroll down the page to view. http://www.atkinsonbasses.com/multimedia.html There may be others on youtube as well. Balcro.

That cardboard idea sounds a simple but effective tuning aid as you've got a bit of flexibility with this driver. You'll find that as you shorten the length of the ports you will get a little more "warmth" to the sound. Not a lot, but a little. Starting at the port length of 130mm, try varying it down to 85mm. Good luck. Balcro

Hello dognofski, Which Celestion Neo is it? The BN200x or the BN220S? You already have 2 ports built in? Balcro.

[quote name='Balcro' timestamp='1342431263' post='1734605'] Monday Bump!! [/quote] Next bump! Calling crag42. If I don't hear from you in the next 7 days I'm going to be sending a pm to Mickeyboro. Balcro.

[quote name='lurksalot' timestamp='1343072133' post='1744866'] The license did not specify 'sound insulation glazing' it specified double glazing , the spec of the glazing was irrelevant to the license as long as 2 pieces of glass were there , Ironically , the pub window frames were/are glazed with 6.4 lam , so stretching a point they already were double glazed. we fitted 6mm tough secondarys with a 100mm space anyway , the techies thought it would be a good job. and everyone seems happy . [/quote] Well, it looks like you triumphed despite the uninformed - not really idiots. The person who wrote "double glazing" was definitely in the category of the uninformed. It could have been the Licensing Officer or it could have been, I'm sorry to say, an Environmental Health bod acting as adviser. Either way the spec words are WRONG and misleading. "Double glazing" which is commonly 4:20:4 in a domestic setting only has a small acoustic effect whereas your "sound insulation glazing" / double window, is exactly what is required. With a 6.4:100:6 system you will probably achieve a full 20dB sound reduction. Balcro.