Hoffman Amplifiers Tube Amplifier Forum

Other Stuff => Cabinets-Speakers => Topic started by: 12AX7 on July 23, 2017, 05:12:15 pm

Title: Cab has problematic resonant peak in the low end range
Post by: 12AX7 on July 23, 2017, 05:12:15 pm: I have a fender 1x12 modeling combo amp made of plywood that has a huge resonance in the low end. It's lessened with a different speaker but still there. It happens at stage volume and I CAN eliminate it bu cutting lows, but when i do the tone sounds like it's missing low end. Try and add it back and boom. Is there a way to make the thing more natural like MDF w/o really hacking it up too badly that should i sell it i can't?
Title: Re: Cab has problematic resonant peak in the low end range
Post by: jojokeo on August 18, 2017, 02:12:31 pm: Long delay for a reply but in case you didn't get it figured out? Is it closed or open back? You can make a hole in the back panel or create a cut-out. Or even a port on the front baffle. Maybe add some interior padding or insulation before modifying the cab?
Title: Re: Cab has problematic resonant peak in the low end range
Post by: 12AX7 on September 27, 2017, 11:59:48 am: Quote from: jojokeo on August 18, 2017, 02:12:31 pm
Long delay for a reply but in case you didn't get it figured out? Is it closed or open back? You can make a hole in the back panel or create a cut-out. Or even a port on the front baffle. Maybe add some interior padding or insulation before modifying the cab?

I just remembered this post and thought i;d see what replies may have gotten. I figured it out tho. It wasn't the cab, it was my strat's trem springs resonating ! I put some foam in there and that fixed it. I still however do dislike the cab because it doesn't sound good. Doesn't sound very full. Whatever it is, any speaker i connect to the amp in a different cab sounds better then if i remove the speaker and put it in the modeler. It's all ply which i thought would be better then the typical MDF but i guess the neutral sound of MDF is what it really needs. Anyone have any ideas of how to improve it sans building a new cab for the chassis? I'm running a ext cab with it now but i'd like to be able to get a fuller sound
Title: Re: Cab has problematic resonant peak in the low end range
Post by: jojokeo on September 27, 2017, 12:52:57 pm: I'd recommend building a new cab out of solid pine. I hate MDF when removing and replacing the chassis, and if changing speakers and you screw/un-screw into it a number of times - the holes become easily stripped. Pine will be lighter and sound better also. Don't try to make it using as small dimensions as possible. Go wider or taller and/or deeper and you will get better bass and a fuller sound.

There's been some group experimentation on optimum cab sizes, woods, etc. but general consensus is try to get around 55 cubic liters of internal space (for a 12" speaker). This amounts to dimensions of appx 21"x16"10". This will give you an idea or range to shoot for but try to get somewhere near these if possible?
Title: Re: Cab has problematic resonant peak in the low end range
Post by: 12AX7 on September 27, 2017, 07:25:47 pm: You misread...it's not MDF.
Title: Re: Cab has problematic resonant peak in the low end range
Post by: nandrewjackson on May 11, 2018, 12:42:08 am: Staple some craft batting inside

https://www.walmart.com/ip/Poly-Fil-Extra-Loft-Bonded-Polyester-Batting-Queen-Size-90-X108/46021937?wmlspartner=wlpa&selectedSellerId=0&wl13=1310&adid=22222222228015426614&wl0=&wl1=g&wl2=m&wl3=40941065912&wl4=pla-78877938992&wl5=9016682&wl6=&wl7=&wl8=&wl9=pla&wl10=8175035&wl11=local&wl12=17808678&wl13=1310&veh=sem.