First time and high end

[HorseWisperer]

I have a dream of first order crossed monitor with Seas CA15RLY and 27TDC. What do you think abaut this combination of drivers and x-over slopes together. ??

[bobhayes]

Pros:
Simplicity, Good drivers, Potentially very transparent.

Cons:
Lobing, Tweeter power handling and resonance, Uneven response.

Try it. If you don't like the cons, build a second order or higher filter.
If you still aren't happy, try zobels, and BSC.

http://www.rjbaudio.com/Calypso/calypso.html

If that's not what you want then try Fostex FE167E! No tweeter, not caps, no inductors, nada.

Regards,
Bob

[HorseWisperer]

I have no drivers yet. My dream is first order design like many high end speakers. I would like to use Seas drivers. I think that when first order filtering is used response of drivers shoud be flat, smoothrolling and wide. Those drivers are best from Seas I think. X-over freq. would be abaut 3500-5000 Hz. Front panel A4. Ported box.
What do you think, is there something else keep on mind when first order filtering a loudspeaker.

[chrisb]

Originally posted by HorseWisperer
I have no drivers yet. My dream is first order design like many high end speakers. I would like to use Seas drivers. I think that when first order filtering is used response of drivers shoud be flat, smoothrolling and wide. Those drivers are best from Seas I think. X-over freq. would be abaut 3500-5000 Hz. Front panel A4. Ported box.
What do you think, is there something else keep on mind when first order filtering a loudspeaker.

as Bob suggested - "the best filter is no filter at all"



but if you insist on a 2-way, finding a main driver driver with wide enough BW and smooth enough roll off on axis to eliminate need for a LP, and a tweeter with complementary requirements can certainly simplify the XO requirements

Our Scandinavian friends make many fine drivers, but not to be overlooked are the Fostex FE/FF & FW/FT series.

You might want to look for a local dealer or DIYer with a Fostex based system to audition. While there's no doubt their presentation is not everyone's cup of tea - you won't know until you've tasted.

As for measured or modeled FR - there's "flat and smooth", and then there's "lifeless" Having built several systems in the past with Vifa & Peerless drivers and "properly engineered" XO networks, with crossover points in the upper MR area (e.g. 3200Hz) , I certainly know where my preference lies.


For example FE167 & FT17H with a single 1.5uf cap will give you a smooth 1st order HP on the tweeter hinged somewhere around 12000Hz or so, with no LP pole required for the mid/bass driver at all. Although some would argue that notch filtering might be necessary for upper midrange peaks, phase plugs and judicious cone treatment have mitigated that for many.

For a US retail difference of approx $20 more for the drivers, (offset by the reduced complexity of required XO filter network), you can expect among other things, an increased sensitivity of over 6dB vs the SEAS.


as always, YMMV, Caveat emptor, etc

[PeteMcK]

Check out

http://www.rjbaudio.com/Calypso/calypso.html

You could try it with the simplest possible xover & then upgrade it if you're not happy

[HorseWisperer]

Is there any other opinions.

[chrismercurio]

No crossover or a BSC circuit on a JX-92s makes a fine sealed, ported or transmission line speaker. Very few drivers are as flexible with alignment. The drivers are more expensive from the Seas, but crossover parts can easily make up that difference.

I built a sealed monitor with the JX-92 about 8 years ago now and it never fails to impress as long as you aren't looking for a high spl solution.

C

[sreten]

Originally posted by HorseWisperer

...... My dream is first order design like many high end speakers .......

Hi,

There are very few genuine 1st order acoustic (linear phase) designs.

Many speakers with 1st order electrical filters claim the benefits that
you would get with a 1st order acoustic design, complete marketing BS.

http://www.t-linespeakers.org/projects/rune/index.html

Is a lot more first order than most.

If you bi-amp the 1st order filters can be easily and cheaply
implemented passively at the input to the amplifiers.

No chance of a proper 1st order 2 way with 1" dome tweeters.

/sreten.

[Tenson]

If you are interested more in the simplicity of the crossover than a linear phase 1st order acoustic slope, have a look at my recently made speakers using the Seas coaxial driver. It has no low pass on the woofer at all, and just a single capacitor and a resistor on the tweeter. I did implement BSC on the woofer though.

Speekerz wot I maid

If you actually want a two way 1st order acoustic slope speaker the only option I can think of is using a Manger driver with a nice 8" woofer. The ScanSpeak 18w would be my choice.