I have an Ampeg PF115HE, and it farts out fairly early. I'd like to get a little more volume (almost exclusively stage monitoring only) without the farting issues. I also have an Eminence Delta 15LFA.
Is the Delta a drop-in replacement for the PF115HE, and will it work well in this cabinet? Would I be better served to build a separate enclosure for the Delta? If so, does anyone have plans for a cab that work well with this speaker?
Thanks for your help!
That Delta 15LFA has pretty "universal" TSP's and a good xmax making it suitable for both closed and ported cabinets. Farting caused by the driver should be gone when you put this one in your Ampeg cabinet.
Since you have the driver just try it, the Ampeg allready has an Eminence driver so mounting will be no problem.
Is the portaflex sealed? This will increase cone excursion. Maybe you can convert it to a ported cab (use some flared tubes):hiding:
The cabinet is approx 75liters, should be just enough for a ported design with the Delta 15LFA.
You already have both speakers, so just try it.
Start with a clean tone at low volume and turn up gradually until you hear any signs of distortion. Make sure it is speaker distortion and not amp distortion. This is your new volume limit. If it's louder than the old volume limit, it's an improvement.
You said it starts giving you "the sound" pretty early, could it be an eq issue? have you tried tweaking your settings a bit, maybe more mid/low mid and less low? even cutting the lows and giving it a boost in the middle? maybe not lots, but a bit of a frownie face?
I always cut lows and boost low mids, so I really don't think that's the issue. Mostly, I wanted to be sure that the new speaker wouldn't be a mid-match with the cab, and that I would realize an improvement in volume.
That said, the Delta15LF is a sturdy driver, and is an "in-between", meaning you can make it work in sealed or ported cabs. And it can take a good amount of pounding. Shouldn't be a decrease in overall volume, but whether or not there's an inceease, or if you like its inherent tone is pretty much a "don't know until you try".
As Arjank said, your box is big enough to make a good ported cab for that driver, should you choose to go that far with your mods. I'd try it as is first, just to get an idea whether or not it's a move in the right direction for you. If it is, but it's not "all the way there yet", I'd try adding more stuffing to the cab, (the PF's are lined, but not stuffed. Some amount of stuffing is pretty much a given for sealed cabs).
If that's better, but still isn't 100%, then I'd consider porting it, starting off with a low-ish tuning and going from there.
All these things will effect the lowend response, power handling and fartout factor. If there's something you don't like about the D15LF's tooend behaviour, well, there isn't much you can do to increase it, it pretty much is what it is. If there is some "peaky" sound up there you'd like to tame, a passive notch filter may help. (Means 3 or so crossover parts and a few minutes with a solder iron.
If it were me, and I already had speaker in hand, I'd take it in small steps, starting with just loading it in there and seeing what it gets you, then going from there. Opting for baby steps rather than chopping wood to start with.
Pretty much have to try something to know which direction it's taking you, as the current speaker is an OEM. You may be surprised. Some OEM's deviate quite a lot from the stock model they are based on to the point they're barely recognizable as such. Others are pretty much paying a fee to change the label on the back. Many are somewhere in between.
Thanks, all. I'll have to give it a shot.
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