Bill Fitzmaurice - Omnitop 12s (built by Insomnia) |
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Tony Insanity
Registered User Joined: 06 January 2008 Location: United Kingkong Status: Offline Points: 236 |
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Thanks for that comprehensive answer Stu.........must have a look at the BFM forum and read a bit more on this piezo thing.
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.....you might also look for her companion, a large Chinese rabbit, who is easy to spot since he is only standing on his hind feet in the shade of a cinnamon tree...
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Disco Stu
Old Croc Joined: 03 March 2005 Location: United Kingdom Status: Offline Points: 2487 |
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If nothing else there are two things worth reading about there
Piezos, and V coupling subs. Stu |
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All you need to know is:
Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
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Steak'n'ale
Registered User Joined: 31 January 2008 Status: Offline Points: 165 |
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You got any pics of what they look like without the grills? Looks like a nice little cab and easy to build too!
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Disco Stu
Old Croc Joined: 03 March 2005 Location: United Kingdom Status: Offline Points: 2487 |
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Not personally but I collected shedloads of BFM pictures from the past 8 years and uploaded them to photobucket so I am sure there will be some here.
Bill Fitzmaurice Photo Album Edited by Disco Stu - 25 April 2008 at 2:16pm |
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All you need to know is:
Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
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Disco Stu
Old Croc Joined: 03 March 2005 Location: United Kingdom Status: Offline Points: 2487 |
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Heres just a few
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All you need to know is:
Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
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ychole audio
Young Croc Joined: 18 January 2007 Location: United States Status: Offline Points: 625 |
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Im using 6 omnitop15 as mid section of my rig,they were loaded with JBL E130's.The sensitivity and response is amazing.I know the omnitop12 should have been much better but i have already those speakers lying around. |
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I am ZERIEL'S dad!!!
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Steak'n'ale
Registered User Joined: 31 January 2008 Status: Offline Points: 165 |
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I'm really interested in building a set of these. I just have a few questions that I couldn't find answers for on the BF forum:
1) Whats this auto EQ thingy you say you use to make them sound good and how much does it cost? 2)When you say you cut down the piezos what do you mean? Do you just cut the sides off so the two horns meet without a flat bit in the vertical direction? 3) Have you heard these with the recommended drivers before as well as the P-audio one? Any comments on if you can get away without EQ if you use the 'proper' bits? |
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Steak'n'ale
Registered User Joined: 31 January 2008 Status: Offline Points: 165 |
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I've just been looking at the Celestion TN1225. This has similar parameters to the eminence and a slight upwards slope (and is mega cheap!).
Reckon it'd work well? |
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Disco Stu
Old Croc Joined: 03 March 2005 Location: United Kingdom Status: Offline Points: 2487 |
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1) Auto EQ, a feature built into speaker management systems that acts as an analyser device in conjunction with a measurement microphone to enable relatively flat frequency response. The device does this by playing back pink noise through the speakers, analysing what gets picked up by the microphone and then EQing to make a flat response, or more or less, bearing in mind its only 31 band. You need something like a Behringer DEQ2496 and a Behringer ECM8000 measurement microphone to do this. OTOH if you have a 31 band graphic and use the exact same components as is recommended you can just go on the BFM forum and look for someone elses graphic EQ setup and copy that as a starting point, tweaking to taste.
2) Its all in the plans my friend. If you look at the pictures on the previous page of this thread you will see how people have cut down and glued piezos up together. The new melded array is in the latest version of the plans and has good output down to below 2kHz, it is the most advanced way to set up piezos but it takes the most work. Well recommended though. 3) No, I built these cabs with the following in mind. My previous attempts at getting a satisfying reflex box were never up to the standard I knew was possible. I had ordered 4 P.Audio SN12MB drivers from PAP with a view to putting them into reflex cabs. Then I went and heard the VOID Static 3, and was completely blown away with the quality of sound and the output. I could not build any more reflex boxes. I had to build horns. So 2 years down the line after buying the drivers, I decided I really ought to get them in boxes and out on the road. So I employed insomnia to build me some boxes with the condition that I would try the P.Audios first and see if they worked then if I wasnt happy, attempt to sell them and buy Deltalites. Soundsystem Dan I think on here has also built Omnitops and DRs and he used wharfdale drivers which worked fine apparently. So I figured there might be a bit more EQ required but it would be ok. As it turns out the P.Audios work better than expected so there is no need to mess about and change them. As to your final question, no, AFAIK ALL speaker systems designed today, are designed to either use the custom processors that come with them or require EQ to make them sound good. There is no way around it, EQ IS necessary, but it doesnt have to be expensive. The omnitops require far less EQ than the DRs but still require it. Stu |
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All you need to know is:
Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
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Disco Stu
Old Croc Joined: 03 March 2005 Location: United Kingdom Status: Offline Points: 2487 |
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The response plot looks very similar to the SN12MB The Fs is quite high, but the rest of the specs look similar to the P.Audio and may well work. Only way is to try, I would make sure you use the melded Piezo array to ensure that you get as much output in the 1-2Khz area as possible. I had mine built just before the melded array was "invented" so I missed out, still looking at a retrofit though. Stu |
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All you need to know is:
Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
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Disco Stu
Old Croc Joined: 03 March 2005 Location: United Kingdom Status: Offline Points: 2487 |
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Look out for the depth of the driver though, the P.Audio JUST fits, the Deltalite is I think a bit shallower. That celestion looks quite deep, check it against the Deltalite and P.Audio to be sure.
Stu |
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All you need to know is:
Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
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Steak'n'ale
Registered User Joined: 31 January 2008 Status: Offline Points: 165 |
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Sounds good. I might try to build a set using the celestion driver then and just budget for the EQ stuff like you say.
Time to give BMF some money... |
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