Project: monitor-XL reference values

[Helmuth]

and from the other side.

[Helmuth]

Measurement amplifier with ucd180.

http://www.hypex.nl/index.php?option...id=10&catid=42

[Helmuth]

Design: As you can see I make all my equipment blackwhite with birch plywood.



TD124 mk1 RB301 new plinth and service

[dabbler]

They look great. Is that an RCF H-100 horn?

[Helmuth]

Originally Posted by dabbler

They look great. Is that an RCF H-100 horn?

Precise i did mount several 1" drivers like DE25 , CP350TI all work great on the low cost horn cut off 800Hz.

http://www.rcf.it/products/precision...ers/horns/h100

1" HF-drivers

1" 35euro
http://bmsspeakers.com/index.php?id=bms_4524
1" down to 800hz
http://bmsspeakers.com/fileadmin/bms...ion_driver.pdf

http://www.bcspeakers.com/CPD/produc...?id=0000000016

beyma brightsound titanium
http://profesional.beyma.com/ingles/pdf/CP350Ti.pdf
soft sound plastic
http://profesional.beyma.com/ingles/pdf/CP380M.pdf

http://www.rcf.it/en_US/products/pre...n-drivers/n350

[Helmuth]

You have to realize that you can cut of very low because in hifi use it is not very likely that the 1" driver gets more then 1 Watt.

because it reproduces 115dB with 1 Watt in most cases what is about the maximum spl of a medium hifi speaker.

[Helmuth]

This speaker is the result for my search for compact high efficiency loudspeaker that can go down to 30Hz.

After many years of simulating my conclusion is physic laws dictate size and low cut off.

compact and high efficient means no subbas. When you want subbas you need to build big or loose some efficiency.

So this speaker is you have to see as high efficient with its 92dB at 1 Watt average sound pressure with this volume, was thought for tube amplifiers from 10-20W. So with 20W we have 115dB max SPL on 1 mtr and without compromising subbas and reasonable compact design.

And of course normal solid state will work to, up to 100W and I use my self the 180W class-D then you will hit x-max more when playing loud.

[Helmuth]

The beyma CP350TI is very nice with the H100 horn because beyma specs 1000Hz XO second order.
In this hifi application it allows first order 1000hz or 800-900hz second order.

[Helmuth]

Let me explain a little for the guys here who have now exspirience with MLS.

A MLS measurement is used to measure the performance of a loudspeaker like in a anechoic room. The MLS technique enables you to trigger the test signal and discriminate room reflections.

Here I have a picture of a MLS Impulse that would be ideal when the speaker would measure like this. Note this one is inverted normal it would be positve.


Here the impulse of my speaker typical result for two way. It are two peaks one the first of the high response and one of the low-response. the second shows some smaller peaks that is not perfect it would be nice when it stopped after the second peak. Whit some experience one can tell it is a good pulse and measurement result.



If a two way not shows the same like this and has a more messy long pulse it is a poor design.

[Helmuth]

In this figure is the speaker loudness red and I post with most measurements the minimum phase in ths figure bleu. A sudden chance in phase is the same as distorsion, in this figure you can see the minimum phase react on the lineair distorsion although it is very low here.
The perfect minimum phase would stay on the null line.



I do not see projects here where al this data is presented. It would nice reveal the faults in a design when its not pefect made.

Above 8kHz the horn driver got some ragged response. But here you cab see the minimum phase reacts on the spl changes.