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TDA MT121 - HR Plots |
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boots-hifi 
Old Croc 
Joined: 15 August 2011 Status: Offline Points: 2479 |
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 Posted: 03 April 2013 at 10:21pm |
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Lev little test myself and Bee ran yesterday in the sun! TDA MT loaded with... BMS 12N610 and BMS 4550. HPF 150 - BW 24 LPF BW - 12 HPF - 1K BW 24 No eq, Pink noise simed. This may or may not be of any interest to you. 
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bee
Old Croc
Joined: 14 June 2011 Location: Middlesex Status: Offline Points: 4549 |
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Posted: 03 April 2013 at 10:34pm |
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best sounding hf i have heard in an mt by a long way.... the 12 is on par with the b&c 12ndl76, which is my fav, Boot's combo defo sounds sweet....... on axis there is not alot of differance in the standard mt to the tda one, off axis the original is better.....
The dip at 500hz is not the driver or cab but something in the way we set up the rta stuff..... very strange..... plotts where taken at 5m mic was leval with 12"..... pink noise was used..... a wall was within 2m of the right of the stack and my workshop was 15m infront of stack, so not ideal testing area, but good enougth for what we was doing..... next time we will do a full sweep signal of cab, and calibrate (spl) on mic..... there is a topic on hear where i posted up actual sweep test's on both mt121 and tda mt121, both loaded with same drivers.... ill see if i can find plotts, these where taken at 2m, sweep, calibrated mic, input 2,83v...... so the plotts are spot on......
Edited by bee - 03 April 2013 at 10:38pm |
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https://www.elements-audio.com
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MarjanM
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Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7845 |
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Posted: 03 April 2013 at 10:54pm |
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Bee which horn is that?
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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levyte357-
Old Croc
Joined: 27 July 2012 Location: UK, South East Status: Offline Points: 8517 |
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Posted: 03 April 2013 at 11:15pm |
This is actual Smaart plot with 12" run downto 150hz !? And BMS 4550 without Eq? With which 1" horn mate ? Have you tried running MT with approx 400W power input down-to 150hz? Cheers for info, Lev Edited by levyte357- - 03 April 2013 at 11:17pm |
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Global Depopulation - Alive and Killing.
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bee
Old Croc
Joined: 14 June 2011 Location: Middlesex Status: Offline Points: 4549 |
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Posted: 03 April 2013 at 11:47pm |
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this is the mt121 half of the roger mogule mt122 design Marjam, not sure on make of the hf horn
not a plott Lev an rta reading of cab... i.e. played pink noise through cab and recorded info in to pc via a rta mircophone via smaart..... no eq just xover only...... blue is the 12" section red is the 1" on horn.... both 12" and 1" was tra'd on it own and combined.... the dip at 500hz is a cause of reflection from a wall less than 2m to the right of the cab ignor spl readings, these are not correct........ the reading with a 10 second average looks alot smoother..... the signal being picked up below 60hz was to do with the mixer output or sound card not sure, need to re check all settings and outboard gear 1 piece at a time..... to find where it was coming from.....
Edited by bee - 04 April 2013 at 12:28am |
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https://www.elements-audio.com
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MarjanM
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Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7845 |
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Posted: 04 April 2013 at 12:42am |
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The HF shows a very strange graph for the 4550. So i guess the horn is quite small. It start going down at like 1.5Khz and it has too much of the very high frequencies. This later not bad at all actually.
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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MarjanM
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Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7845 |
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Posted: 04 April 2013 at 12:42am |
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Any picture of the box?
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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bee
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Joined: 14 June 2011 Location: Middlesex Status: Offline Points: 4549 |
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Posted: 04 April 2013 at 12:44am |
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sure give us a sec and ill find one.....
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https://www.elements-audio.com
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bee
Old Croc
Joined: 14 June 2011 Location: Middlesex Status: Offline Points: 4549 |
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Posted: 04 April 2013 at 12:47am |
  top cab is the mt bottom left is a turbo sound bhp115 bottom right is my new prototype bhp115
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https://www.elements-audio.com
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bee
Old Croc
Joined: 14 June 2011 Location: Middlesex Status: Offline Points: 4549 |
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Posted: 04 April 2013 at 12:52am |
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the plot may be due to xover position, the 12" was crossing out a bit above where the 1" was crossing in. this where it sounded best, not where the driver could be xover at....
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https://www.elements-audio.com
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MarjanM
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Posted: 04 April 2013 at 12:54am |
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That is fine, i am a bit puzzled by the response 6Khz and above. That is the RCF H64 horn and i have measured that one with 4550 and my results were not even close to what you have there. What kind of mic you are using? Is it calibrated?
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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bee
Old Croc
Joined: 14 June 2011 Location: Middlesex Status: Offline Points: 4549 |
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Posted: 04 April 2013 at 12:54am |
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ill ring boots in the morning and see if he had a combined reading, im sure i saved a snapshot....
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https://www.elements-audio.com
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boots-hifi wrote: