Scanspeak 23w4557t00-04

[yara]

Does anybody has experience on this sub?
heard 2 setups with the passive radiator. impresive on a 0.7 cu. lots of low, great sq.
thinking of getting this sub as for car use. as the recommendation for this enclosure is pretty small. i might go for 0.8cu.

[yara]

no body use this sub b4??

[MauriceNL]

I am also interested in experiences with this unit!

I already have ordered two of these babies, where each unit will be placed in a frontspeaker loaded by a Hypex HS200 subamp.
It will be a closed box and I plan to design a Qtc of 0,57. The result will be 30Hz at -3dB and 20Hz at -8dB!

And the use is only for music!

Furthermore I will use a scan-speak 18W8546 mid in a closed box and as tweeter the D2905/9900 revelator (I already have these units in a standmounter).

[michaelpage26]

Yara isn't it really expensive for just car use?

MauriceNL which crossover point will you use? And please inform us )me and Yara) about its capabilities (detailed, transparency, "fastness", punch etc)

Thanks in advance

P.S look at the http://www.speakerland.nl/HOT.htm

they use it in an intresting design (see attached file)

[MauriceNL]

Originally posted by michaelpage26
Yara isn't it really expensive for just car use?

Eek!!! Indeed, very expensive one!
Ah what the heck, maybe I will also give it a try, since I will have two units by that time

Originally posted by michaelpage26

MauriceNL which crossover point will you use? And please inform us )me and Yara) about its capabilities (detailed, transparency, "fastness", punch etc)

Experience will tell what X-over point I will use, but I think I will use 150Hz (cut off with 24dB/octave) From there it can only be lower. Remember I will use 2 seperate (stereo) subs!

Originally posted by michaelpage26

P.S look at the http://www.speakerland.nl/HOT.htm

they use it in an intresting design (see attached file)

I already new that one
The use in that design convinced to use this unit. A cousin of me actually heard that design and raved its fastness and details. And he is critical when it comes to low frequencies.

I bought my DIY kit (scan-speak reference monitors) in that shop (I live in the same country and that shop is about 70km's from my house )

I will keep you informed, but it will take some time

[michaelpage26]

Well, actually I will use stereo subs too , with 180-150hz crossovers, to the full range ESL 3 from Rob Mackinlay ER-Audio, that I will be building in a couple of months. You are too lucky that you live only 70Km far from that shop. I wouldn't expect the Maximas to have really detailed sound (midrange) with the two 5" Revelators, in comparison to some Excels, Etons or Scan-speak Kevlars, ESLs etc. but I think it would have great bass.
Also as i don't speak Dutch at all, can you please tell me what does the speakerland site says about the maximas. Is the sub unit active, any crossover points, any opinions about sound quality (mainly bass)?

-A bit off topic: can you understand how are the pieces of mdf are sticked so beatifully in the Korrect XT? I would like to mimic it in my sub projects!

Also I would like to thank you in advance for any upcoming information and opinions about bass quality of your stereo subs project (Scan-speak 23W/4557T) even if it will take time (please don't forget us ).
Good luck to your project, and we expect progress and pics

Regards

Michael

[MauriceNL]

Originally posted by michaelpage26
Well, actually I will use stereo subs too , with 180-150hz crossovers, to the full range ESL 3 from Rob Mackinlay ER-Audio, that I will be building in a couple of months.

Well I am interested in your future experiences!

Originally posted by michaelpage26
You are too lucky that you live only 70Km far from that shop. I wouldn't expect the Maximas to have really detailed sound (midrange) with the two 5" Revelators, in comparison to some Excels, Etons or Scan-speak Kevlars, ESLs etc. but I think it would have great bass.
Also as i don't speak Dutch at all, can you please tell me what does the speakerland site says about the maximas. Is the sub unit active, any crossover points, any opinions about sound quality (mainly bass)?

A small summary of the site:

The maximas are sealed boxes, for bith sub and "monitor" top. Both are braced internally.
The sub is active, with a Hypex submodule (I do not know which one, but I guess it will be a DS series) and the volume of the box is 30 liters.
Total weight is 65 kg, height 120 cm. The top speaker has an efficiency of >90dB.

Because of the enclosed houses, we reach the best impulse behaviour with a real tight and clear bass reproduction.

Imho 30 liters is way too small! Then it should be stuffed with 100% Dacron or something like that, and even then I doubt you will get a real tight bass. But I am picky when it comes to bass

I think the whole system will be very dynamic, despite the closed boxes.

If you want to know more, I think you can always e-mail them. They are probably also willing to share the drawings and XO details, and even their own measurement results!

Originally posted by michaelpage26
-A bit off topic: can you understand how are the pieces of mdf are sticked so beatifully in the Korrect XT? I would like to mimic it in my sub projects!

Yep!
They just glued some panels to eachother and then milled a groove. Details can be seen in the attachment, where they provided full drawings and schematics. They are in Dutch, but when you do not reckonize a word, I suggest Interglot.com and/or Babelfish

Originally posted by michaelpage26
Also I would like to thank you in advance for any upcoming information and opinions about bass quality of your stereo subs project (Scan-speak 23W/4557T) even if it will take time (please don't forget us ).
Good luck to your project, and we expect progress and pics

Regards

Michael

I will keep you informed!

[MauriceNL]

I have just made some screenies from WinISD.

I compared two boxes, one of 30 liters (Qtc 0,75) and one of 95 liters (Qtc 0,57). Please be aware both simulations are of boxes without dampening!

In these screenies you can see what a lower Qtc can mean for your bass reproduction. A roll off which starts a little sooner, but also flatter. Also lower phase shifts and lower group delays!
Gain
Phase plot
Group delay

[MauriceNL]

Hmm, attachment seemes to be too large

Well, from THIS LINK you can download many speakerdesigns as can be seen on the Speakerland website, including the Korrekt XT.

[michaelpage26]

Thanks MauriceNL for the link and comparisons! . I have also done the comparisons with the same results, so I will be going with 100L with this sub driver (in case I use it)