Alpair 10.3 dual help

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#21
Thanx for the help ��
Going to be fun carving wood again.
The alpair10p has been a good companion for a couple of years now, and they sound fantastic. Perhaps i will combine with a sub?
Which fullrangers do you guys like best?

Best regards
 
#22
planet10 said:
64 litres is an ML-TL.

A10.3 in 25 litres starts looking ugly, but you aren’t actually using them for bass. Have you tried damping the vent?

dave
Click to expand...

I use them both with and without the extra woofer. depending on where and for what i set them up. And they work both ways in reality. I don't damp the ports, i tried with putting some foam in them when connected to the sub, but that sounded very ugly as the ports are still slightly loaded due to the slow cr curve (1st order) but so soft you don't hear it until they are damped...

That is also what many reggae and dub soundsystems do. They use the classic Dual G subs (ported dual 18" cabinets) as kickwoofer (85 until 350 a 450Hz). The box is tuned to 37Hz (F3), but they cut it at 85Hz (4th order L/R) without damping the port and this works better than damped or a similar sealed box.
 

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#23
Hi . I would like to talk about experiences with reflex tube size .I have tried winIsd and I also tried some of the plans that I have found online with the tube around 3.5 diameter and 8 cm(or 6 �&#56596😉 long and some others but I have never been really satisfied. Before I have build my boxes I had some old boxes and they had some tubes around 5 cm diameter and about 11 cm long .For me that sounded great so after playing around a bit I have got the conclusion that 5 cm diameter and 10 cm long in 16 L sounds best . Now , I don't know how this looks on the paper but I'm inviting you to experiment or to comment .Tks
 
#24
Hello all,

Sorry for resurrecting this old thread. I have purchased two pairs of Alpair 10.3, and due to the space constraints I have place for only one set of speakers.

Having this in mind, I have looked for the twin/dual Alpair 10.3 designed enclosures on this site and found these :

1. Twin FrugelHorn XL :
https://frugal-horn.com/downloads/TwinFHXL-extents-050818.pdf

2. Twin MLQWs (I suppose related to Eland enclosure) :
version 1 - https://www.diyaudio.com/community/threads/alpair-10-3-dual-help.341853/#post-5894769
version 2 - https://www.diyaudio.com/community/threads/alpair-10-3-dual-help.341853/#post-5895236

3. marKen (Fonken) with dual Alpair 10.3 (this one seems very nice) :
https://www.diyaudio.com/community/threads/colins-clearance-thread.305049/

Apart from these three, are there any other floorstanding enclosures that exist ?

Thanks!

Regards,
Filip.
 
#27
Sorry for the confusion, I thought that the name is correct (per first post in the link I pasted above). What would be the proper naming/type for this kind of enclosure ?

IMG-8a2390cc8eed9bad63703ab87f710654-V.jpg


First of all I would like to know what kind of amplifier is suitable for driving them (I have class AB with high damping factor/low output impedance).
Reading through the posts I got the impression that amplifier with high(ish) output impedance is more suitable, but please do correct me if I'm wrong.

Secondly, is this enclosure part of the paid planset as it is somewhat unique ? Do you happen to know the external dimensions ?

Thirdly, what are the projected Fb/F6/F10, if you have this information ?

Thanks for your help!
 
#34
This Twin A12pw is the same volume and could easily be adapted for A10.3/A10p. Venting and driver mounting would change.

Of the miniOnken family it would be, IMO, acoustically the best shape, but the more difficult flavour to build.

TwinA12p-Mar-Ken-extents.png


Woulkd require a short stand or sides extended to the floor.

dave
 
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#35
LeifB60 said:
What are the advantages of using 2 identical drivers?
Click to expand...

Depends on how they are wired.

I would wire in series and put a big shunt cap on the bottom one.

Advantages:
0/ in the bass you have 2 drivers working so each has to only do half the work.
1/ no change in level as transition is made between 1 ndriver and 2 drivers
2/ Since the driver limits are most likely going to be in the bass you are capable of 3dB greater output before the speakers start strainging
3/ Low pass means single driver coherence and dispersion up top.
4/ since the driver doing the top has to do less work in the bass, it does a bit better mid/top than if it was doing all the lifting
5/ if a SS amp, 16Ω means the amp is working a bit less, and should sound better
6/ bigger

Disadvantages:
1/ if a SS amp, 16Ω means the amp has half the power at low frequencies
2/ costs about twice as much
3/ bigger
4/ no change in level as transition is made between 1 ndriver and 2 drivers so this cannot be used to compensate for baffle step

The compromises with the other 2 wiring scemes that make them les desirable to me is:
Parallel wiring: Unless really far-field parallel wiring gives combing up top that reduces DDR/detail
Parallel with a series inductor has a 6dB lift in level when the transition from 8Ω to 4Ω which really throws off the room response. Can be countered with a big room and pulling them way out from boundaries

dave
 
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#36
j4n3zz said:
Sorry for the confusion, I thought that the name is correct (per first post in the link I pasted above). What would be the proper naming/type for this kind of enclosure ?
Click to expand...

Those are for the original A10. Colin’s build. Like the ones i posted above they need help reaching the floor, these have an empty bit on the bottom — fill with sand.

Derived from the Fonken165R

Fonken-167-trio.jpg


This is the rectangular version, easier to build than the trapezoid but with a bit higher diffraction signature. Could also be adapted for A10.3 and A10p (where it would come in 2 sizes). The 10.3 version (and the smaller A10p) could have a larger cavity at the bottom to give a wider range of options for using it for a helper woofer.

This is an example. I'd most likely put the bass driver on the side or back.

fonken167_2-way.jpg


dave
 
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#37
Holy time warp Batman! FWIW my sister still has the Walnut floorstanders in her Willis Point home, but I can’t remember the last time they were fired up. FE167, IINM?
After some of our later W.A.W experiments, if wanting to add bass augmentation in the lower compartment, I’d be inclined to a pair of smaller woofers in an opposed configuration.
 
#39
FE167 Fonken internals. time stamp in my photo library on the group shot says May 2009, so yeah, that’s a while ago.
As it turns out, my other sister had the mahogany pair, but hasn’t used them in a while. They were a bit of an impulse buy on her part, and life has got in the way of her rather short term non strategic planning. 😉
 

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#40
LeifB60 said:
What are the advantages of using 2 identical drivers?
Click to expand...
Essentially double the power-handling, & +3dB greater outright headroom, albeit as Dave says with differing power demands / current draw depending on whether you wire in series or parallel. With identical units, in theory you have less in the way of variation on the horizontal polars (assuming they're mounted one above the other) although you will on the vertical -how much & where depending on the listening axis & what if any filtering is in place.
 
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