Best horn for BMS 4544 CD |
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jerronimo
Registered User Joined: 11 July 2009 Location: Nederland Status: Offline Points: 438 |
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Posted: 31 October 2011 at 8:41pm |
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Hi guys,
I currently have a set of double 12'' (BMS 12N620) and 4544 (on a Celestion H1-9040P horn) bassreflex tops and they sound amazing on low listening levels.
I cross the CD at 1300 hz (24 but.)
But now my problem, when I play guitar heavy music at high volume they start to sound (very) harsh, some EQ makes it sound better but still not how I like it to be.
So I thought it may be the horn causing problems, what kind of horn do you guy's suggest is best for this combination?
Heard good things about the 18sound horns like the 18sound XT 120 and XT 1086 ?
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hmaudio
Old Croc Joined: 03 April 2009 Location: Nottingham Status: Offline Points: 3844 |
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Tony Wilkes is the man to ask about bms
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Nottingham based cab builder. https://www.facebook.com/HMAudio-154352667920145/?ref=bookmarks
This account is used by 2 people. |
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Tony Wilkes
Old Croc Joined: 02 August 2004 Location: West Midlands Status: Offline Points: 4840 |
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Faital LTH102
You will find that on a lot of horns the 4544 4550 and 4552nd need to have the region around 5K reduced by up to around 5db. This makes an enormous difference to the sound at high levels. Try a PEQ with a reduction of 4db and around 0.8 oct bandwidth. |
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www.forteaudio.eu - BMS - db-Mark Processors - Lexon (SAE)
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Meat
Old Croc Joined: 05 June 2009 Location: Manc Status: Offline Points: 1514 |
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I used the XT1086 and 4544 together on some tops. They were the best bit of that cab, it was a shame the mid section didn't work as well so consequently I don't have them any more. The XT1086 'sounds' more beamy than the polar plots suggest IMO but I do like them and just got some more.
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Don't test the champignon sound
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synaesthesia
New Member Joined: 19 November 2011 Status: Offline Points: 4 |
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In Dieter Achenbach's quick test of different horn / driver combinations, the RCF HF94 (cd) and the PAudio PH230 (birad.) won against 15 other horn's on the BMS 4544.
i have tried to translate the classification system from german into english, please follow the link for the horn driver combination test: http://lsv-achenbach.de/horn_treiberkombis.htm
Edited by synaesthesia - 19 November 2011 at 12:19pm |
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Meat
Old Croc Joined: 05 June 2009 Location: Manc Status: Offline Points: 1514 |
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Thanks, thats an extremely useful chart. Its nice to see that someone who has obviously been systematic about their testing has put up their results.
Its interesting that amongst all the drivers tested they find the 4544 the most tolerant of putting on 'any old horn'. |
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Don't test the champignon sound
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cravings
Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7441 |
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what's going on with the beyma td235 horn there?
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Tony Wilkes
Old Croc Joined: 02 August 2004 Location: West Midlands Status: Offline Points: 4840 |
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Could well be down to its exit angle. Tony |
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www.forteaudio.eu - BMS - db-Mark Processors - Lexon (SAE)
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Steve_B
Old Croc Joined: 29 September 2007 Status: Offline Points: 1587 |
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From the chart it seems to me that a compression driver with
a “useless, extremely wavy frequency response” does not miraculously get a flat
response if put in a different horn, and vice versa. Some response plots and polar patterns
would have been more useful. Larger horns should provide better loading at lower
frequencies. Using a horn that is too small will affect the frequency response
at lower frequencies. Horns with abrupt changes in cross-sectional area and wall
angle cause reflections back down the horn (as does too small a mouth area). This
too will cause dips and peaks in response. It also causes the infamous horn
honk sound. In choosing a horn decide on the frequency range and
dispersion angle you need. That will basically dictate the mouth size and
length of the horn. Also try and match the dispersion angle, at cross-over,
with that of the drive unit covering the frequency range below it. With an even coverage, if you flatten the response on axis
it will be flat off axis too. A wavy frequency response does not automatically
render a drive unit useless. |
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