Peshkov Sub - Scoop / Tapped / ARLS???

Peshkov wrote: Ibex wrote: Why did he finally change to one WSX? ...cause of lower cut-off frequency? Did you also engineer the top on these 3 subs shown on the pic?     Yeah, WSX is much lower than this microbes with 65Hz cut-off frequency (for 3pcs)/  The problems with "quick" LF was eliminated  after a birth of this 3-way sat (MB-2x10"/MF-10"/HF-2"). and finaly, i don't like a scoop-constructions subs because of its questionable compromise. I think that freq band widening in all types of lspk is not justified.

My simulation of 3 micro-subs says that they can do 60Hz@-3dB...?
I also made a comparison with one WSX.
I thought that the WSX only works in an array of min. 4 pcs.?
If i can trust my simulation skills, then one WSX has an -3dB of 73Hz...?


The top looks very interesting too!
What's the 3-way sat able to do with it's 2x10" MB-section (-3dB)?
How do the 2 slot-loaded MB work? Are they reflex-loaded and mounted inside the port?
Do you have a thumbsketch?

bitzo wrote: I'm sorry Ibex but stipe microscoop like the hog scoop aren't only a scoop because the driver is in the horn mouth like a tapped horn. But if you change the driver arrangement in tapped horn, you can't sim the combined response.

Hy bitzo!
Your reply is justified, but i thougt that it would be correct to model it as an FLH with a path difference (only 11cm) in the combined response, because the rear of the driver is mounted in a rear chamber and not inside the horn.
But as we can see in the next simulation, i failed with my speculation
I'm happy that the difference isn't too big!
Does anybody know why the two simulation aren't congruent???

So, here the the hornresponse input data for the downscaled Micro Scoop loaded with the 18Sound 12LW1400 modelled as a tapped horn, followed from the comparison of the response to the RLH version:


black = tapped
grey = RLH

bitzo wrote: The driver is mounted in the horn mouth and has a rear chamber. IMHO , tapped or rlh, both aren't the correct drive arrangement. Compound neither fit with this cab, I'm not english and I've learned by myself using HR so I don't understand very well the offset driver arrangement, but it's the last one....or perhaps HR has its limit

Maybe the tapped and the scoop plot  are different because of marginal unequal hornflares?

ARLS, Tapped Horn, RLH (with driver mounted inside the mouth)...
They are all congnitional, with special parameters:

- big or small rearchamber or no chamber

- long or short hornlength

- low or high flare rate

- rear of the driver firing through the chamber into the hornthroat or direktly into the  beginning of the  horn

I think the offset driver arrangement won't be targeting (in the case of a FLH like the punisher or afterburner it would be correct to use this function).
I also learned HR by myself.

TDA-Audio wrote: Макс - Welcome ты хоть и вынужден быть менеджером -но я уверен - дух инженера в тебе жив!!

mobiele eenheid wrote: Maybe the tapped and the scoop plot  are different because of marginal unequal hornflares? The tapped and scoop plot are different because the scoop plot doesn’t take the “tapped horn effect” into account, whereas the tapped plot does.   From a simulating perspective, simulating as a scoop (with or without taking the path length difference into account) is less accurate (double checked that with McBean a long time ago).   The biggest difference between an ARLS-type hybride and a tapped horn is that the ARLS-type trust more on the large Vtc to get a decent low frequency response, whereas “normal” tapped horns only have a Vtc in the order of several liters. Give a tapped horn less length and a larger Vtc and practically you get an ARLS.   Recently I’ve measured multiple hybrides with variations in both the horn length and chamber size (effectively variating it between an ARLS and a Microscoop), all showed more correspondence with the tapped plot then the scoop plot. I.e. 2 (bumpy) peaks at both the high and low cut off. The depth inbetween the peaks is more pronounced with a 15” then with a 18” in the same model and also slightly dependant a how the cabinet is placed.   The driver is mounted in the horn mouth and has a rear chamber. IMHO , tapped or rlh, both aren't the correct drive arrangement. Compound neither fit with this cab, I'm not english and I've learned by myself using HR so I don't understand very well the offset driver arrangement, but it's the last one....or perhaps HR has its limit Driver arrangement – Offset: Newer feature to calculate a horn where the drive isn't firing straight down the horn but rather starts further down the horn from the sides. I.e. the 1850 horn, CV-style fold, Punisher, etc. S1 – S2 = horn before (the middle of the) driver, S2 -S3, etc. = horn after driver. Compression ratio = Sd/S2.   Best regards Johan