frugel-horn flat pack; what do you think?

Thermionics

Post Whore In Training
Those look fantastic. Not sure how much bass you can realistically expect from a CHB, even when horn-loaded, given the bass drop-off begins somewhere north of 150Hz. However, I'd love to be proved wrong on that! :)
 
If you have any gaps the air leakage will diminish bass for sure.
Also the amount of stuffing has some effect .
The ones I built have a surprising amount of bass.
Of coarse once to swap driver you will know if it is just the corals
 

rogerfederer

Junior Member
Follow the break in guide for the Alpair’s and you will be rewarded
actually, they are already broken in; i mistakenly used them with my aiko horns for a while (not a good match), but i broke them in then.
but they haven't been used for several years so i'm sure the drivers need to wake up
 

rogerfederer

Junior Member
after about 3 days here is a prelim report re the alpairs:
1. they are less efficient than the CHBs
2. they produce more bass but so far it is boomy

i'll run them a few more days to see if the bass improves. if not i guess i can play with placement. would they do better a bit off the wall? maybe not right next to the aiko horns?
 

StevenZ

Active Member
after about 3 days here is a prelim report re the alpairs:
1. they are less efficient than the CHBs
2. they produce more bass but so far it is boomy

i'll run them a few more days to see if the bass improves. if not i guess i can play with placement. would they do better a bit off the wall? maybe not right next to the aiko horns?
If you still have them placed like the photo above, then yes they would do well getting them away from the wall. I'm not certain but I don't think these were designed for near wall or corner loading. And yeah, they're very inefficient. I think the spec sheet says something like 85db. Mine like a bit of juice, and tubes. They love tubes.
 
The Frugel Horn seems like a hybrid of TQWT and rear horn. In this thread over on Audiocircle the designer indicates that the default driver for the design was the MA 7.3, indicating it needed at least 10 wpc. David from Planet 10 joined the discussion regarding the range of suitable drivers and system adjustments that may be appropriate.

With the default 7.3, the speaker will likely be more balanced pulled away from the wall/corner. This should knock down some or all of the boominess. With a higher efficiency driver with a rising response (Foster Fe126e, CHB, Omega RS5) we should see a better balance using these closer to the wall or as corner horns, especially when driven by SET.

The FH Mk1 design had as an option a freestanding rear deflector placed against the wall that extended the mouth expansion of the horn.

The loading they were designed for depends on the characteristics of the driver you are using. If your driver has good bass in a bass reflex enclosure it would likely work better in the FH when pulled away from the wall a bit.
 

rogerfederer

Junior Member
well, i'll give pulling them out from the wall a try. i had assumed the FHs were designed for corner loading. thanks for the explanation.

i am running them with my decware zkit amp, which is maybe 2-3 wpc. maybe i need to pull out a bigger amp to make them sing. i have a fisher x200 that has been patiently waiting on the shelf for such a moment... what do y'all think?
 

StevenZ

Active Member
well, i'll give pulling them out from the wall a try. i had assumed the FHs were designed for corner loading. thanks for the explanation.

i am running them with my decware zkit amp, which is maybe 2-3 wpc. maybe i need to pull out a bigger amp to make them sing. i have a fisher x200 that has been patiently waiting on the shelf for such a moment... what do y'all think?
Yes this!
 

rogerfederer

Junior Member
Yes this!
OK, pulled them out from the wall. will get the x200 out tonight in time for the opera!

UPDATE: turned out my 2:00 call was actually at 2:45 so quick put the x200 in the rig. using it as a power amp with the volume turned all the way up. (fired right up, which is always nice--had been sitting for a year.) so far sounds great and the bass is less boomy. will give the new config a few days. thanks for the helpful suggestions :)
 
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rogerfederer

Junior Member
Dave also noted that the Alpair had the longest break in time of the drivers he auditioned.
i had previously gone through the recommended break in routine with these drivers. however, as they haven't been used in a few years they may take some time to loosen up.
 

StevenZ

Active Member
The funny thing about Mark Audio drivers, as Dave mentioned many years ago is something like this “you can spend many thousands of dollars on your upstream components before the Mark Audios ever become the weak link”.

As someone who has spent many thousands of dollars on various upstream components over the years I can verify that this is true. I have yet to hear a component or cable change in anything upstream that wasn’t instantly revealed by my Mark Audios. Ymmv.
 
The amounts of stuffing has very noticeable effect also.
You may try adding / subtracting and see.
I was surprised by the difference with mine and intend to revisit once again when I get time.
 
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