Balcro

Here's one I prepared earlier.......... an old winISD file. 2013 to be precise. I can't remember why I did it, but it saved a bit of time. Back then I was working with an internal volume of 29.5 litres. Fortunately the T/S parameters for the Eminence Deltalite 2510 II have not changed over time. All I've done is change the volume and the program re-calculates the ports etc. Assumptions for the calculation: 1. The panel through which you're going to cut the hole for the port is 18mm thick. 2. The internal diameter of the plastic port is 110mm (11cm) and the external diameter is 120mm (12cm). Gross Internal volume 33 litres. Minus the volume of the Deltalite - 0.74 litres and minus the net area occupied by the port - 2.16 litres. This leaves a net volume of 30.1 litres. This gives an overall port length (from the exterior opening to the end of the port on the inside) of 20.96cm (8.25"). Port tuning works out at 57.06 Hz. With a 90w input, port velocity is about 14 metres per second. With a configuration of two 1 x 10's that input is a safe but conservative [u]estimate[/u] for general operation For a graph of how this looks, see the link on Phil Starr's post #10. It's very close to that. Not optimum but more than workable for a standalone 2 x 10 or more correctly 2x (1 x10) in this case. Good enough to dispense with the 1x15. For the best results, consider using the 2 x 10 on it's end i.e. one drive unit above the other. If that is not practicable for one reason or another, then ignore that last point & use it horizontally. Now decide where to place your ports. Don't place the port outlets on the bottom of the cabinet; 15mm is nowhere near enough to allow the ports to "breathe". There is a technical minimum for this; it's probably related to port diameter or something, but I can't remember which, so play safe and don't place any obstruction within 8" of the port opening.

Downloaded that latest version of winISD from the facebook link and the home-page, but Norton Anti-Virus took umbrage with it on both occasions. Something called Heur.AdvML.C was identified and it was removed to the vault. ?

In my previous life as a sound-level meter carrying professional, I have sympathy with you and the venue. It looks like the new owner is manipulating 100 year old case-law to make more money from his investment. Rushing around with a sound level meter and making a big hullabaloo looks like deliberate scare tactics, and any sound level reading he has taken will not be repeatable in court. Only the judgement of an independent professional from the Local Authority would carry any weight. There's a lot more to "Noise Nuisance" than a simple uncalibrated sound-level reading from an untrained whinger. Presumably the building is an obvious music venue with advert boards or posters outside that are clearly visible to the general public and has a Public Entertainment Licence. The venue owners need to stand firm and not be intimidated. The venue owners/manager could consider contacting the local authority and enquire if they have received any complaints.

Hello hrnn1234, I've just checked this speaker out on winISD and it comes as no surprise that it is totally unsuitable for bass guitar use. It's a Bass-Mid P.A unit and only handles the nominal power down to about 200Hz !! xMax is feeble at 1.29mm. Below approx 200Hz, xMax was exceeded with a 50watt input! Others may may come along later to give you advice on similarly priced alternatives that are suitable for a closed box. Balcro.

Hi lagartortazo, Having checked out all the choices on your list with winISD, I can't find any that produce a good response in 39litres (half the cabinet net volume). As Phil Starr has said, the Beyma 212 works well enough to be usable. Without touching the existing second port it will have a tuning frequency of about 51Hz. However, it will change the sound balance of the system because it probably has more low bass than the original GK unit but is probably less efficient (a fraction less loud) overall. See winISD graph of the Beyma in 39litres of air space. Double click on the attached thumbnail picture. Over here the Beyma is about €100. You'll have to wait for the reply e-mail to learn the cost of a GK original. Good luck. [b]PS. Don't forget to check that the speaker mounting holes of any replacement are the same diameter as the GK originals.[/b]

[quote name='lagartortazo' timestamp='1489788265' post='3259960'] Around 125 litres, and port measurements are 12x24cm Thank you [/quote] Using your dimensions, I get a nominal internal volume of about 83 litres. Looking at the GK site for the MBE(ii) the internal dimensions appear to be about 115 litres. In both cases there needs to be an adjustment for the volume occupied by the speakers, bracing, port(one or two) and the drive units. Can you confirm that the dimensions you quoted are internal. Balcro.

This says it nicely. http://ianhunter.com/main/ Goodbye Mr Quietman. Thanks for everything.

Maybe the screws/bolts/T-nuts holding the drivers to the front baffle are less then secure. Make sure they're all tight. Don't tighten them excessively, just evenly and firmly. Also tie up & secure any sagging wires. Have you filled in the old tweeter aperture?

Looks like you'll get there, but more by luck than judgement! See here, http://www.eminence.com/pdf/Legend_BP1525_cab.pdf and scroll down to pages 19-21. It's loud, but.... Balcro.

I think I can see an additional function here for my cheapo but worthy Behringer BEQ-700 graphic equalizer (A Boss GEB-7 clone) . I bought it last Christmas for the fun of it and hovered back & forth for days between it and the Caline CP-24 (a clone of MXR 108 10 band equaliser). In the current discussion I would have been better off buying the Caline (circa £30), but since I only play in "the den" I saved about £12. The Behringer and the Boss have a cut & boost slider centred on 50Hz. With full cut, that will take out some of the electronic low level nasties between 40-60Hz and will probably make for a crisper sound without sounding tonally much different. The MXR and the Caline have 31.25Hz (that 0.25 of Hz is so important) slider, so at full-cut will possibly remove 10-12 dB of electronic & acoustic rumble between 20 & 40Hz. That's much more effective and a possible speaker saver. It would also seem to make sense if the equaliser were first in the pedal or rack-mount chain. Clean-in, clean out. That's all good but there may be more. After searching on "Microthumpinator" and "Fdeck" I read (in the other place) an interesting observation from a Mike Arnopol - "Put in the HPF (High Pass Filter) and dialed it up at the highest setting. The clack was gone. As I expected, but so was the low bass. Kept dialing it down. I wasn't a whole lot past the lowest setting when I didn't really notice the missing bass. But no more voice coil smack. The interesting thing---the C8 actually got LOUDER. I think it was because I was no longer using my amp's recources amplifying crap I didn't want to amplify anyways. The C8 as well as the 88 go substantially louder with the HPF. Substantially louder." PS. Search for "Behringer" directs you to "music-group.com", but click on the links & Norton Security pops up with a warning of an unsafe site!! The detail indicates there's a Trojan in the "downloads" section?!

He should have remembered the old adage "if it ain't broke don't fix it". This is from nearly 7 years ago - Lakers v Rocket, game 5 play-off. It's just over 2 minutes - more straight ahead all round. When you get to about 1 minute, turn up the volume and enjoy classic bass tones. https://www.youtube.com/watch?v=EGuEagHDL9M Balcro.

It's probaby all linked back to the DDOS attack on the BBC. That sort of thing usually has a knock-on effect. It will get better.

[url="https://www.youtube.com/watch?v=Amhy7LcAdGQ&list=RDAmhy7LcAdGQ"]https://www.youtube....t=RDAmhy7LcAdGQ[/url] Happy Christmas. PS. Scroll down for comment by Dave Hopkinson.

Have you got the caps-lock key switched on? Balcro

Something(s) nice and simple - http://www.thomann.de/gb/ghs_7200_m_all52_medium.htm http://www.gear4music.com/Guitar-and-Bass/Fender-6-Patch-Cable-2-Pack-Black/JCQ Balcro.

Hello Biro, Well, that's for me. If you send me a PM with your address and a contact phone number, I'll make arrangements to pick it up. Donation to basschat to follow. Balcro. PS. I'll be back in about 6pm.

Hi dave_bass5, Going off at a tangent - your earlier question about outputs into 8 or 4Ohms has already been answered. Rather, picking up on your post #9. Why do you say the MarkBass doesn't like going beyond half way? What speakers are you using with it. As per your equipment profile or something else? Just 1 speaker or 2? Balcro.

Hello there, I don't think it's esoteric, but there's a prety good range of stuff. Oh! And some surpeising prices. http://www.woodbrass.com/en/BUY+WOODBRASS+STORES+PARIS - and scroll down for the addresses. Have a nice few hours. Balcro

Well that's the good news for the day. Onwards and Upwards. All the best for the future. Balcro

It's been a journey. This started me off - "A that's what I want moment" - https://www.youtube.com/watch?v=7TgJU3nmAV8 Then the first Aaahhh, yea, nice, moment - https://www.youtube.com/watch?v=qeltg7TzF9I Older and a little greyer gave me this and the first tingle - https://www.youtube.com/watch?v=Cd52NfJIfY8 - It's very long but worth it. graduation to the second tingle - thanks youtube - https://www.youtube.com/watch?v=TQaXh28tzyo - ignore the moments of background chat, just look at the players face at the end.... and lastly the nirvana of tingle, with tears in the eyes - https://www.youtube.com/watch?v=FqtIlaHIqrs

Well, lookeee here Maxn! Guess what I just found by asking Jeeves. http://www.jblproservice.com/pdf/thiele%20small%20parameters/theile%20parameters.pdf Balcro.

hello Maxm, This site will be good for starters - [url="http://unofficialacousticcontrolcorpmessageboard.yuku.com/directory#.VVUexpM3R_k"]http://unofficialaco...ry#.VVUexpM3R_k[/url] Also try searches on JBL K140 - they're prized treasures for some people. You may also see modern comparisons on the usspeaker.com web-site. Balcro. PS. Oh, and this - http://www.jblpro.com/pages/obsolete.htm

Hello stevebasshead, I've had a look at a few 10" options and there is no shortage of speakers to fit in as a 4x10. Some are pretty weak and others look really great with lots of power handling. Also don't be surprised by a difference in tonal balance. However, as jtuk says , you have to look at the cost. Four new speakers (in general) can cost from £200 to over £325. By the way, what speaker is fitted in the box at the moment? Balcro.

Hi stevebasshead, Once you've fitted the new empty front baffle and secured it against battens or whatever, what (height x width) dimensions remain? Can you still fit two 10" speakers side by side and still leave room for some wood between them? If that's possible, then divide the internal volume by 2 or 4. That gives you the possibilities for volume per drive unit. Some, not all, loudspeaker manufacturers publish data showing a suitable volume for their speaker drive units on the product page. Check their web-sites. For others you'll have take the t/s parameters and run them through winISD to see if the volume is appropriate. Also:- 1. What are you trying to achieve? 2. What is the existing internal volume? 3. Why change from a 15" drive unit? Balcro.

Hello d-b, Judging by the steel basket, those speakers appear to be Celestions, custom made for Trace Elliot. Send an e-mail to - [email protected] -- and give him a full description of your speaker. He can probably tell you a modern equivilant that will be suitable. See also - celestion.com/contact/ Balcro.