Crossover nightmare......

[barackuda]

psych - i dont want to make an enemy of you.I just asked for help with x-over.Lot of yous used this speakers that i am using, so i expected some contribution to this thema.In my opinion there is no thing such as PERFECT LOUDSPEAKER, wich can reproduce the sound 100% naturaly.No matter how hard you try, a couple litres of volume can not replace the whole orchester.I am not a profesional, just want something SELFMADE, thats also sound nice, is not screaming, and is a little bit designed to my tastes....so please no fighting.....i mean no harm

I would appriciate if you have any suggestions to these speakers, that i have in mind.Such as - is the tweeter good enough for the mid/sub? What should i be looking for in the XO with this particular midd/bass driver etc. etc.

Anyway, thanks for your insight in things "loudspeakers".

Danny

[alan-1-b]

Danny,

do you own any Test Equipment ?

Such as a Multimeter with an AC Voltage range ?
and an Audio Frequency generator or Sine-wave oscillator ?

Do you have the Data Sheet for the G18RNX/P ?
If not, then go to:- THE ART OF SOUND PERFECTION BY SEAS - Home
and look on the "Vintage Drivers" page, and in "Prestige Woofers" there.

This looks like a good driver, thus is worth making a good cross-over for it,
and a suitable cabinet .

Why do you want to squeeze it into a very small 8 litre cabinet ?

In a much larger cabinet it can be made to work down to 60 Hz or 70 Hz,
and with suitably low Q then for the driver-in-cabinet bass roll-off to be used as part of the cross-over
for when you use it with a sub-woofer.
It will play OK bass itself in a suitable cabinet if you have a small room,
but if you want high volume level in a large room , then a 10" added for low bass will be needed.
You do not need an expensive ScanSpeak 10" for good low bass in a sealed cabinet -
- there is a suitable 10" SEAS.

Choice of tweeter depends on at what frequency you decide to cross over from the G18.
After inspection of the Data Sheet, I see two obvious frequency areas to cross at:-
around 2kHz, and around 4kHz.

If you cross at 4kHz, the smooth slope of the driver's roll-off can be used as part of the filter,
but for good midrange sound you will need to listen on-axis to the G18, and that is not a problem
if you use high stands - make suitable height stands - I do.

You can then use the SEAS 19TFF1 tweeter, because that has good off-axis response to high frequencies,
thus will give a well balanced sound combining with the G18 on-axis - if you get the cross-over design right.
19TFF1 can be crossed quite easily around 4kHz.

If you cross at 2kHz you will need to use a tweeter which has a lower Fs than 19TFF1 has,
and ideally one with an Fs well below 1kHz,
but most of these do not have as good off-axis response to the highest treble as 19TFF1 has,
except for a few expensive tweeters from other manufacturers.

To design a suitable cross-over you will need some Test Equipment,
and I think it better to spend money on that and not on an expensive ScanSpeak 10" driver.

Make a good 2-way with the G18 SEAS, and then make the subwoofer later.

What is your room size ?

What are some critical-for-bass response recordings you own ?