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I don't really know. Ultimately you are trying to turn sound energy into heat, and the movement of the sound absorber walls can contribute to that, so depending on the design, the cylinder, being stiffer per material thickness may be less effective. No, and I'm not sure that a strict Helmholtz...

The "box" itself will have resonant modes "room modes" . The inlets and outlets make the box a Helmholtz resonator. The inlets and outlets have pipe resonances. A "high Q" is a narrow frequency band, say 1/6 octave, a Q of 8.7, a 1/3 octave is 4.3, one octave 1.141...

Junior Varsity would be more appropriate, but nobody cares.. Listen to the headphone output, if it is clean, the problem is in your Bose Pro16 L1. Yes, you are probably hard clipping/limiting the speaker system. The 16x2" speakers have less output potential than a single 8" speaker, and only...

Roel, Adding two more subs to the four you have will add about +3.5dB level. Doubling amount of subs would add 6dB, the equivalent change of being as loud in the back of the tent as it is halfway back with four. If you were using the 20% larger KS118, 18" subs, they would reach about 3Hz lower...

Roelof, If your QSC KW122 are raised above head level, they are capable of over 90dB SPL at 30 meters. Your four dual 12 subs can get louder than that. That's loud enough for a party atmosphere, and is around the permissible NIOSH SPL limit of 90 dB for 151 minutes. Halfway back in the tent...

Pocket hole jigs and screws can be used for those types of shallow angle joints. https://www.kregtool.com/shop/pocket-hole-joinery/pocket-hole-jigs/ Pneumatic staples or nails can also be used.

The difference is in the vertical pattern in the crossover range. Horn loaded response will add a little gain in the below the crossover range, but require more EQ to even the peaks and dips out. For small gigs, getting the horn above head level gives the advantage to TMM. Haven't checked past...

A flickering tube is generally bad, or has intermittent connections. The Sovteks should glow blue. If you swapped the flickering tube (good idea to # & date the tubes) to another position and it flickered there, and no other tubes flicker, replace it. You probably should check the bias on your...

Might be corrosion in or on connections or PCBs.

Anna, A good option to avoid the off-axis comb filtering (peaks and dips, lobes) problems of multiple horizontal speakers is a single coax driver. The 4" B&C 4CXN36 coax would fit in your height requirements, in around a 2 liter sealed box response from ~95Hz-18kHz. B&C makes the FBCXN36...

I have not heard either, but the PM60 has a more efficient folded horn design, and a uses a co-axial mid/high compared to the T24's short conical front loaded 2x12" horn and 3" diaphragm HF driver, so it should achieve a higher SPL and sound cleaner than the T24. The T24 from it's Fb at 73Hz to...

Yes, the rear speaker's sound is affected by whatever is put in front of it, often detrimentally. The effects depend on the size, shape and reflectivity of what is in front. As mentioned, without proper polar response measurements the effects can't be determined. There are many examples (EAW...

The largest horn RCF makes is the HF950, 300 mm / 11.81 inches wide, like Peter said, a suitable size to match a 12" driver. The Limmerhorn 250m is 390mm wide (15.34") close to 15". How about that :sleep:?

The Limmerhorn 292 is 18" (470mm) wide, Peter was looking for a 15" (381mm) wide horn. The 292 is about halfway between the B&CME464's 22.6" (575mm) width and 15"...

If you are using the FAT 32 format, might be running into it's limitations-FAT32 only supports individual files up to 4GB in size and volumes up to 2TB in size.

DSP settings for the DCX 464 (or any other driver) depend on the horn used. Few horns will support 300Hz, crossing above 500Hz opens up a large variety. The mid section broadly peaks around 1.8kHz, the HF has fairly sharp dip between 5 and 6kHz. As Uwe mentioned, the DCX 464 has a wide overlap...

Since the moderators removed the post written in French complaining he couldn't get his old amps serviced by Harmon, looks like I revived the zombie.

Since Samsung absorbed Harman in 2016/17 and laid off most of the Crown employees, closed the Elkhart plant, moved production to Mexico, things changed. Lab Gruppen was acquired by Music Group in 2015, their service is difficult at best. Since it is cheaper to replace old USA products with new...

Josh Ricci's Gjallerhorn gets down to below 20Hz, big, complicated build: https://www.diyaudio.com/community/threads/gjallerhorn.189784/ His Skhorn is a 24x32x54" cab with dual opposed 18 or 21" pro drivers. All vents open 30Hz tune, 2 vents open 25Hz tune, 1 vent open 17Hz Fb. Huge thread...

The TL-15 is already over -8dB at it's tuning frequency (Fb) of 40Hz. Covering ports to drop the tuning to 28Hz will drop the response about another -6dB , requiring four times the power to compensate. If you are using the cabinets for anything other than a home stereo, the additional boost...