Ampeg 1540 15" Replacement

Discussion in 'Amps and Cabs [BG]' started by JerryTheFly, Jun 4, 2019.

  1. JerryTheFly


    Apr 2, 2016
    I've been running an 810 with my lows going to the bottom 410 with replacement neo speakers (Deltalite IIs 2510s, freq range: 60hz-4k), but my buddy has a 1540 cab and I was wondering if I'd get more low end from the 15" if I swapped it out with an Eminence Delta 15LF (freq range: 40hz-2.2k).

    Just wondering if it would be a good idea to trade and invest in a new speaker.

    I've been trying to figure out the cab's tuning and volume for WinISD, but I'm not finding much information. Any help would be greatly appreciated! Thanks!
  2. Warpeg


    Jun 20, 2005
    1. If I am understanding correctly, you are running a bi-amped rig with bass going to the bottom 4x10 section and highs going to the upper 4x10 section. Is that correct?
    2. Assuming that is the case, why would you want to do that? If bass frequencies are what you're after, then keep in mind that you removed quite a bit of your bass response potential when you cut the lows from the upper 4x10.
    3. Did you model the Deltalite speakers with the cabinet to make sure that the cabinet provides adequate cubic footage and porting for the drivers to operate correctly for your needs?
    4. When comparing your DIY 4x10 solution to the SVT-1540: "Getting more low end" is usually more complex than just comparing drivers' frequency responses. Other considerations include cabinet size, porting, cabinet location (eg. near a wall, near a corner, at ear-level, etc.), room characteristics, amplifier (eg. Available power, EQ, etc.), effects, and instruments. There are probably more considerations that I'm forgetting.
  3. If the cab internal volume and tuning were known the Delta 15LFA could be modeled. Otherwise, the only way to tell would be to try it. Below about 600 Hz, the Delta 15 LFA has a sensitivity of only 96 db/w/m, so would likely have difficulty keeping up with multiple 10's. Also, it has only an average amount of linear excursion (4.8 mm). It would likely not significantly outperform the four Deltalite II 2510's.

    As pointed out by Warpeg, cutting bass from the upper four 10's may not have helped your quest for more low end. If you noticed an improvement with the Deltalites then they are likely working adequately (if not optimally) in that cab. You might consider replacing the remaining upper four 10's with Deltalites and running the cab as an 810.
    BasturdBlaster and Warpeg like this.
  4. JerryTheFly


    Apr 2, 2016
    I'm running the bottom 410 with an Orange OB1-500 and the other 410 is just an EHX mini battalion into a 100w power amp, with the lows rolled off and the highs up. It all sounds great, just lacking in the chest-thump a little. But honestly, I can't ever get enough of that. I could try letting more bass back into the EHX side.

    I did not measure the cab before putting in the Deltalites. But they are WAY less farty than the stock 10s.

    I guess I'm more just curious if anyone knows what the volume and tuning frequency of an Ampeg 810 are (I believe the 1540 is the same size), so that I can run the numbers of the 15 vs the 10s. But it's kind of seeming like there's not going to be a huge difference, not enough to justify the cab swap, purchasing a new speaker and the additional weight.

    As a side note: the 410 on the 810 is not ported. The 15 on the 1540 is ported.
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  5. BasturdBlaster


    Feb 19, 2012
    Crandon WI
    The original 1540 15" driver I assume is a cast frame eminence vs the delta LF.... if the delta is stamped basket then my gut tells me it wouldn't compare to the original driver.

    I've heard a few 1540 cabs and they sounded great but I feel an 810 (ran fullrange) sounds even better:)
    Last edited: Jun 4, 2019
  6. BogeyBass

    BogeyBass Inactive

    Sep 14, 2010
    I'll try not to be negative.

    1540s freaking suck
    They don't make " more bass" than a 810
    They make less

    Ampeg uses a cast frame legend.
    Eminence CB158
    3.6 cubic feet tuned to 40hz

    Also have used stamp steel Eminence
    Special design. Similar to Beta 15 and closer to the older Gamma 15. Don't matter they sound the same and suck against a 410

    Also , did I mention? 1540s suck lol.

    This coming from a guy that has exclusively used Ampeg 810s 20 plus years.

    Your talking .9 cubic feet per driver x 8
    In sealed cabinet.
    Only way get more bass from the thing is run all matching factory drivers. Technically the air space is to small for that driver . you get the classic sounding bloom which is a big 100 hz peak from the airspace being to small. Multiple by 8 and bingo. Bass

    Realistically I'd just cut 100 hz and boost 60 and 80 hz. And basically use 2 cabs and over EQ the krap outta it.

    Otherwise after years of playing them. I just used normal EQ and was fine with it.
    BasturdBlaster likes this.
  7. JerryTheFly


    Apr 2, 2016

    Hm. By those specs maybe a Kappa Pro 15LFC will work... Says resonant frequency is 37 and ideal for vented with 2.84-5.54 cuft. I really just don't have the technical knowledge to know if that will even make an improvement at all. Haha
    Speaker Detail | Eminence Speaker

    Also, I totally hear what you're saying, and I've read up on the 1540s and it seems to be the consensus that they suck. But is that because of the enclosure design or the driver itself? (Or both.)

    I didn't really want to get too into it, because it's kinda specific and super dumb, but running the 810 full range isn't an option for me with my setup. I run 2 810s in stereo on stage, both split. The top two 410s are octave up "guitar" signals, while one bottom 410 is clean bass and the other is dirty bass. And I need all 4 of the signals to be able to be individually controlled (so 4 separate amps). It's definitely not a normal situation... I literally just want as much low end oomph as I can get out of my clean bass signal (Orange OB1-500) as possible, given the restrictions I've put on myself. I feel like I'm pushing the 410 as hard as it will go and it's not crushing like I want. But it sounds like the 410 or 115 in this configuration probably won't do that on their own regardless.

    Thanks for the input, guys! I'll just be happy with what I've got. Which is ridiculous enough as it is, honestly.
  8. BogeyBass

    BogeyBass Inactive

    Sep 14, 2010
    Single 15 at 96dB will not do a thing up against say 100 to 106 dB of 10" speakers.

    10x power to even get 3dB.
    LFA will be toast and inaudible even before it gets halfway there.

    I've bounced back n forth between ported 2x15 and sealed 810

    And it's basically a 4x15 to get same SPL as a 810.

    I liked my 4x15 ported setup. But I wasn't gonna carry 4 cabinets on the trailer.
    So it was easier to run 2 810s on tour.

    Anyhoo in your situation up against 12 x10" drivers.
    I'd say it's at least high power 2x15 and plenty of watts. Technically it be more like 4x15 or 6x15

    Weird huh.

    I Added a third 810 and another head and fully cranked it really didn't get louder. I knew it was on. But it just inaudible.
    You have to double speaker area to gain 3dB so up against 2 x 810 technically I needed 2 more cabs to make a slight difference.
  9. JerryTheFly


    Apr 2, 2016
    Oh Jesus. Well, I guess I'm talking to the right guy. Most people just tell me I'm crazy, but sounds like you're way ahead of me. Haha Thanks for talking me down!
  10. BogeyBass

    BogeyBass Inactive

    Sep 14, 2010
    The over EQ trick is simple lol.

    But is what it is.
    I pretty familiar with the spongy spot of a 810
    And .9 cubic feet will always be that. No matter what driver is in there

    I'd say with those Delta's you have.
    If you did have a cab. Fully loaded with 8x those. And used that as your dedicated
    Bass" cabinet.

    It could work...ish they just have slightly more overhead. And it's just alot more dedicated cone area to bass. Definitely alot more sensitivity. And kick a stock 810s booty.

    Or spend the money on just pair 2x15 ported cabs. Or pair of old school Acoustic 408s lol
    Is 8x15 enough

    I've done the whole 2 different heads or 3 heads and yes of course some with distortion some not.

    Likewise used 810 and 1x18 and mixes of all kinds of cabinets.

    Fun as it was. I found running 2 cabs and 2 svt heads. Was way way more consistent.

    At first I did have fun Making EQ slightly different on both heads. And likewise use combination of different distortion / fuzz etc.

    But eventually found using one head as the master. And just slave the other head. Basically making EQ and Volume control exactly the same with the master. The other was just a power amp.

    Even that wasn't necessary. But the 2 ohm taps on my classics just seemed spongy. Liked 4 ohm tap better.
    Likewise cooked 2 heads running 2 ohm taps. Shouldn't make a difference with tube heads.
    It was just coincidence that I cooked the screen resistors on one and few tubes on the other on 2 ohm taps.

    Had a backup SVT but that died too.
    Got really sick of finding repair places on tours. And when the backup for your backup dies lol. Just wanna die

    Anyhoo blah blah

    Sound and tone and everything seemed much more consistent with just master/slave head. And 16 matching drivers. That was the point.
    If I wanted to do a different head / different EQ thing. I'd probably still just use same 2 cabs for both , all same drivers
    Last edited: Jun 4, 2019
  11. BogeyBass

    BogeyBass Inactive

    Sep 14, 2010
    I'd say not worry to much about " deep" bass.
    Smaller club shows it was amazing.
    But for the most part, the super bass I did hoax outta it. Was just fun for me on stage.

    In a metal/ industrial band
    Up against real drums, sampled drums and bass heavy synth parts

    Only thing that put me in the mix was just not using pedal distortion. And racking the heads into a grind.

    But I almost miss running one head clean.
    Then the other head I slightly shifted the mid settings. And got a evil growl with a Maestro Bass Brass Master.
    That's what put me in the mix, likewise just 2 grindy heads slaved.
  12. PrinceByTor


    May 25, 2019
    Spokane, Wa
    I own and use a 1540he paired with an SVT-VR and the 15 inch does put out more low end; you can feel it. The top portion is the same sealed 4x10 as either top or bottom of an 8x10, but the bottom is ported and can go as low as 28hz whereas the 8x10’s usable is 40 hz as they advertise. Believe me, you can hear and feel it, especially further away from the stage. Bottom line, you wouldn’t have to change the 15 to get really low end.

    Last edited: Jun 5, 2019
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