Jump to content
The Classic Speaker Pages Discussion Forums

Search the Community

Showing results for tags 'switched to dayton rst 28a4. both a4 and h4 work equally well'.

More search options

  • Search By Tags

    Type tags separated by commas.
  • Search By Author

Content Type


  • The Classic Speaker Pages
    • News
    • Library Additions and Corrections
  • AR and its New England Progeny
    • Acoustic Research
    • Advent
    • Allison
    • KLH
  • Other New England Speakers
    • ADS
    • AVID
    • Bose
    • Boston Acoustics
    • Bozak
    • Cizek
    • EPI
    • Genesis Physics
    • Snell
  • Speakers and Electronics In Need of a Home
    • Dahlquist
    • Dynaco
    • Rectilinear
  • Other
    • For sale / Wanted
    • Members Pictures - Speakers, Electronics, etc.
    • Mods, Tweaks, and Upgrades to the Classics
    • Other Speakers and Electronics
    • The Kitchen

Find results in...

Find results that contain...

Date Created

  • Start


Last Updated

  • Start


Filter by number of...


  • Start





Website URL







Found 1 result

  1. High Sensitvity 92 db 2-way Speakers Using JBL 127H-1 and Dayton RST 28-4F The modern high quality HT speakers tend to have typically 86db/2.83v sensitivity, limited primarily by the relatively smallish woofers used in them. The newly introduced Dayton RST-28F4 has a sensitivity of 93.5db even without a waveguide or horn. In addition, it can be crossed low(1400 hz). I jumped at the opportunity to use it in a pair experimental 2-way high quality DIY speakers with sensitivity around 92 db/2.83v. For the woofer, I just happen to have a pair JBL 127H1 woofers available. JBL127H1 has advanced magnetic structure, 2-inch voice coil and was used in many commercial and professional speakers (4410A, XPL 160A, L80T and T3). The measured sensitivity was 92db with very low distortions (less than 0.5% even at 95db SPL for most frequencies), according to a review by High Fidelity magazine. In a fully stuffed sealed cabinet of 0.7Ft3, I estimate the Q of the box will be around 1.1 and -3 db around 60 hz, plenty low for a HT speaker. One can choose other options if deeper bass is desired. TS parameters and suggested enclosure sizes are published here. http://ampslab.com/blog/2018/05/06/jbl-127h1/ The current crossover (GS-1) is voiced mostly by listening and probably can be simplified further. My reference speakers are Infinity Reference 162 as reviewed here. https://www.soundandvision.com/content/infinity-reference-r162-speaker-system-test-bench. My big surprise is the spectral balance of my JBL127H1 /RST28 F4 is very similar to Infinity R162 and certainly no lacking of details and spaciousness. I would rate the transient response of both speakers to be equally outstanding. I can listen to either speaker for a long time without listening fatigue. In conclusion, you can build a higher sensitivity speaker by using a high quality large diameter woofer without losing sound quality.
  • Create New...