tweeter control L pad


Is no secret , that old time loudspeakers supply with L pads , as all amplifiers supply with treble and bass control. It was era Hi Fi sound. Now is High End time. Most of the amplifiers ( some exception)  no   tone control. Majority loudspeakers also , exceptions   high cost  loudspeakers got jumpers to get 1,2 or 3 db controls.    Another hand, when folk listen   some famous brands still complain -sound is too sharp or too dull, no transparent .  I decide to install in all speakers L pads,   What do you think?
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I am a big fan of L-Pads.

I learned some of this here recently as I just removed/replaced my existing L-Pads in my Vintage 3 way system made in 1958. ’Brillance’ (tweeter volume) and ’Presence’ (midrange volume).

Vintage speakers were DESIGNED with the L-Pads in mid-attenuation position, then boost or cut a specific driver’s volume.

They let you adjust for either ’live’ rooms, or ’dead’ rooms; and adjust for your preferences; and your individual hearing characteristics, which change as you age. Upgrade your tweeters, then tame their volume.

They let you control the VOLUME (not frequency characteristics) of drivers, individually, relative to the other driver(s), AFTER the preamp, amp, speaker’s crossover.

They are NOT tone controls which alter the preamp’s ’frequency characteristics’ prior to the amp, and prior to the speaker’s crossover.

L-Pads are different than potentiometers: the L-Pad maintain the resistance shown to driver and resistance shown to the crossover as it cuts or boosts volume. Thus you want 16 ohm L-Pad for 16 ohm drivers. 8 for 8 ....

History: Vintage speakers were Mono, often in corners of rooms. Then add a second speaker in the same room when stereo came along. Manufacturers test/you audition speakers all you want, they will not sound the same in any unknown room!

IMO, modern speakers ought to include quality L-Pads, with precise stepped attenuation settings (ability to precisely match left to right in symmetrical rooms), and offer the potential of varied adjustments in irregular listening spaces, various ceiling heights, ...

Irregular spaces are another reason a primary balance control to vary side to side volume and then L-Pads for individual drivers output volume.
Electro-Voice Model Six, a 4 way system, had a unique attenuation scheme, with 5 specific attenuation choices, using resistors rather than L-Pads.

https://products.electrovoice.com/binary/E-V%20Six%20EDS.pdf

Because they were specific settings, they were able to measure and publish 5 specific frequency graphs, shown above.

These speaker systems went far beyond Hi-Fi, the equipment had to catch up to them.


I don't have  "L-Pads". 
I have electrostatic level controls with delayed response.
Make yourself happy.

My biggest issue with adjustable L Pads is not performance but reliability. They get scratchy/noisy and subject to burn out over time.

A better approach if you can afford it and have the space is multi-position switches. The contact/wipers are much beefier, and you can use your own resistors, overrated for wattage of course.
I'm a Mac guy, I'm a L-Pad guy.. simple.. They CAN be a problem usually from NOT using it. I move L-Pads once a month on the gear I'm using.

I lube L-pads on stored gear pretty good along with silicone treatment for the foams, before I decommission gear.

A cotton swab of peppermint oil goes a long ways too. Rats hate peppermint oil. I hate rats, squirrels, mice, moles, hamsters, gerbils, minks, ferrets, weasels, or nutria NEAR my gear..  Peppermint oil, no critters. I'm happy, they are too..

The reason for the little story, a buddy had a rat in a pretty expensive speaker that was stored.. The passive radiator on the bottom was blown out and it was stored in his garage, we couldn't figure out WHY the L-Pads (BOTH) quit working on one speaker.. That's right! They chewed pissed and crapped on EVERYTHING. I fixed it for him VMPS RM40s.

LOL I was gonna buy them, I wound up selling a pair of mine to him..
I forgot about those.. GREAT speakers..RM40s

Regards
@erik_squires  i just gonna make post   but  @oldhvymec  made good post before me. I agree, L pad  is better to use very rare ,may be one time according to you taste and  acoustic room performance . In this case  no any issues with L pad