Lowther vs Manger

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Hi!

A friend of mine who loves recording classical music put a friend in touch who had a problem with storing his Dad's old Mangers. He'd obviously had his eyes on the Mangers for years . . .

The friend brought the Mangers over and we auditioned them. Polite, flat, subtle are the expressions I understand are used about them, and then I switched over to a pair of Lowthers in front horns using backwards-into-the-corner facing Acoustas for deep bass. . . . My Manger friend could not believe his ears, saying they were the best speakers he'd ever heard . . . instruments jumping out at you in a nice and pleasing way . . .

However, when he went, his son having become fractious at this stage, I tried a little experimenting. Just as people complain of lack of bass with TP1s and simply say "turn up the bass", I turned up the treble on the Mangers and they sounded like the Lowthers . . .

It seems to make nonsense of so called flat frequency responses. Are the measurements wrong or do our ears simply like something different?

Best wishes

David P
 
Manger FR above 200Hz

MangerFR.jpg

Lowther FR to same scale (if you open it):

LowtherAcoustaFR.jpg
 
Hi David ,

normaly they present two worlds ( for mine ears ), maybe because this
was a pair of old Mangers , they needed mor treble , but the newer ones
are okay . I like the Manger more than the Lowthers .

Juergen

Hi!

This is very intriguing! Certainly the Mangers with the treble turned up are very good, but it's shocking to have to apply so much treble control on the amplifier! To what extent is the treble of the newer units better?

Many thanks

David P
 
You get a better handle on the Manger when you measure in the time domain. It has a very fast risetime of 13usec and is phase linear over a wide range. See the step response measurement from the Manger website. The treble response from 1989 on to my knowlage is slightly disfuse field equalised on axis over 10kHz to get the correct treble balance in room. The model for this is the Schoeps MK2S microphone. Older units have a Samaruim Kobald magnet and never ones very strong neodymium tablets to improve sensitivity. When that transition took place i do not know.
 

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step response

Hello,
thats right,
look my measurements with Manger 1991,
a measurement from mr Manger,
look the step response,
one of the best,
less highs are an illusion because the Manger has no
high resonanses whatsoever, look the Waterfall,
a Lowther is with the wizzer cone much more difficult.
basstubamess
here Lowther measurements
http://www.aer-original.com/html/hobby_hifi_01_jan_2002.html
 

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Hi David ,

Joachim Gerhard has perfectly answered your question , no wonder for me ,
because Joachim build the Medea with 3 Manger MSW on the Top-Enclosure
per Channel . So Joachim Gerhard has more expirience as most people ,
because he worked with Josef Manger + his daughter Daniela Manger .

Jürgen
 
Mr. Pass measurements look plausible to me.
In the Medea i was able to reduce the energy losses at 800Hz and 1.8kHz by a particular design of the inner structure. The outer drivers gave the front driver pneumatic "push" by a hollow resonator inside resonating at 800Hz and 1.8kHz. I also damped the backwave by an "acoustic swamp" that started with no damping, little damping, more damping and maximum damping along the depth of the cabinet. The Manger membrane is very opaque, so i could reduce the sound that travels back through the membrane from the inside. Mechanically i designed it as a "funnel". The cabinet around the drivers was quite soft and the cabinet got stiffer and stiffer in the back. That way i was able to "evacuate" the mechanical energy because the speed of sound in a stiff structure is higher then in a soft structure. I also used a higher xover frequency then it was usual in those day. I think Daniela went also higher up in her new Studio Monitor.
This compromises "open time" in the Step Response somewhat but sounded more clear and dynamic to me.
 
There are hints showing that the crossover frequency of the new active Manger monitors is 330Hz. But they don't say what order and filter function they are using now.

In the "old days" it was usually around 150 Hz (varying by some 10 Hz - depending on speaker model) and 3rd order (acoustically - of course).

According to Mrs Manger the "holes" at 800 Hz and 1800 Hz are caused by the inner and outer ports of the diaphragm moving out of phase relative to each other. I didn't measure it but Mrs Manger said that the effect would decrease with increasing listening distance.

Fortunatley the two holes are not disturbing that much.
OTOH I will try to EQ them out a little next spring (when I can do measurements outdoors again).

Regards

Charles
 
Mangerhole

Hello,

i heard the Manger over 10 years,
a least i found that voices sometimes
are sounding with a "shadow" caused by the
Manger "hole" ~1800 Hz.
And in comparison to other fullrage constructions
the sweet spot is to small.
Therefor i constructed the POSAUNE a
double horn with two Manger,
much better soundstage, and the construction
itself, position Manger to Manger, gives a
SPL plus between 1-2 kHz.
 

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There is a trick to increase the sweet-spot of the Manger which was once presented here somewhere by a German forum member.
You can use a dome tweeter on the back of the box that counteracts the narrowing beamwidth at higher frequencies by the addition of reflected diffuse sound. The tweeter needs to be lower in level than the Manger.
I once made a quick-and-dirty try of this principle with some D260 that were laying around. It basically worked but it would need some fine-tuning. I just used some RC Series circuit in order to reduce the level and keep low frequencies from the tweeter. This is of course not a proper implementation but it served the purpose of satisfying my curiosity quite well.

Regards

Charles
 
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