https://www.synapsestech.com/tags/st21/ Recent content in ST21 on Synapses Technologies, LLC Hugo en-us Wed, 23 Sep 2026 00:00:00 +0000 https://www.synapsestech.com/products/hardware/audio-video/sonance/landscape/james-landscape-series/st21/ Wed, 23 Sep 2026 00:00:00 +0000 https://www.synapsestech.com/products/hardware/audio-video/sonance/landscape/james-landscape-series/st21/ <h2 id="introduction">Introduction</h2> <p>The ST21-4 is a 21&quot; subterranean subwoofer designed for high SPL bass output in outdoor environments. It features a powerful 21&quot; transducer, optimized for maximum excursion and SPL, delivering exceptional low-end performance for outdoor audio applications.</p> <h2 id="product-gallery">Product Gallery</h2> <div class="product-gallery" id="gallery-5658226383403138018485467712322011867686611337255205875594503607122917843265106594377273117995041966881392647754996194724628352775416859589726875038042948115994283885936219914199128375179186983479953508826697196393272461680999495267188213222514944473252624888677679557808633447567939827855093347862923525058214017183064510687344358825621800144949885899603099061182515051644806514643541124092584713246351991433521430531705399591714764174745616631940787996605170638369008421612951858104189191097985551989437361240378313513823697716321633370875346676662622690314877726823413392656440671000181544891115203851979833219556921475301694721582660768619293924114431067297089911456240898922648954947056386935663798561039371952651843556017171821596035012194665405158086118678945339902829057461722874478828696769364212225697932210767491475162351246632128696229539876121290689637272547325953598627612483929453985379077496529354510288935659767347457620298693515717765812444484137499211635422314477023488076185727523243748683365758221946704143457324664795269211666984670835836572789492377343129012519027070034647199765277757871699323991169950650755474294856492213115389811166813648759104965514820082987247953236885370691934467258296883805183524817226947661331860864320824303926833590394667244302896283994171137280719956924929984441538389277355681999468827465817703487893682886663826546983411197604738921749822315433642648596320593029764910826397336640528126432297190238116733240216961745573553966420623785570866825416150754855241555696910181310757418353543684011395122815843944263012928727260907152594894171308781054887515291557134236127460629275962677471689163236958145608532622243627968207807816022690446881512323880953420342971185298135789954709180371980528437214828698977494646443177509187157971179158743468177449845492460941945962444924414745386753785809645256714097629373040476377052724725345637363454220357375322713049572068415539385377724777415814222662930073389025417317682831986538741064834988338457533149996155799271485713435858731816208855508400183772841455585857553979684973531789876511661044411208183061942614502786461257459414254331227768394383348069312076602595961884595870100975650273803112562684516548887513653710512895279526421647165854732454175209979802936832568432227337452640242976244850665106008582765541239542431699897328764865527203082987824318129081363075095218493301274067138058491349387967472951255733850031524553644623019482301718643337285771878748513381932802181913594692838385928216419563394232346339679091494078346368963279427397786044017013762619239015623395949028536864275757330292056134875259662044558667870707312887941797067927281609112791515231603969287658313674055963697796943453293868819741108614517667562565590366357227173886037495239372379197892387186814230591754318935486239145852256764673760874051128185944825961879045743141363610584268963524834392142750204398950846"> <button class="gallery-nav prev" onclick="moveSlide(-1, this)" aria-label="Previous image">❮</button> <div class="gallery-container" onclick="openGalleryLightbox(this)"> <div class="gallery-item"> <img src="https://cdn.shopify.com/s/files/1/0796/0408/9136/files/ina6pewlb5kw2t6awmpr.png?v=1785456564" alt="James ST21 All Terrain / Subterranean landscape audio, image 1" loading="lazy"> </div> <div class="gallery-item"> <img src="https://cdn.shopify.com/s/files/1/0796/0408/9136/files/gczeqy1wcvwh1dii9clu.png?v=1785456555" alt="James ST21 All Terrain / Subterranean landscape audio, image 2" loading="lazy"> </div> <div class="gallery-item"> <img src="https://cdn.shopify.com/s/files/1/0796/0408/9136/files/zmt7fzitwjtaphlmpywp.png?v=1785456558" alt="James ST21 All Terrain / Subterranean landscape audio, image 3" loading="lazy"> </div> </div> <button class="gallery-nav next" onclick="moveSlide(1, this)" aria-label="Next image">❯</button> <button class="gallery-expand" onclick="openGalleryLightbox(this)" aria-label="View fullscreen">⛶</button> </div> <dialog id="gallery-lightbox" class="gallery-lightbox" onclick="if (event.target === this) this.close()"> <img alt=""> <button class="lightbox-close" onclick="this.closest('dialog').close()" aria-label="Close">✕</button> <button class="gallery-nav prev" onclick="lightboxMove(-1)" aria-label="Previous image">❮</button> <button class="gallery-nav next" onclick="lightboxMove(1)" aria-label="Next image">❯</button> </dialog> <style> .product-gallery { position: relative; max-width: 1200px; margin: 0 auto; overflow: hidden; } .gallery-container { display: flex; transition: transform 0.5s ease-in-out; cursor: zoom-in; } .gallery-item { min-width: 100%; display: flex; justify-content: center; align-items: center; } .gallery-item img { max-width: 100%; height: auto; border-radius: 8px; box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1); } .gallery-nav, .gallery-expand { position: absolute; background: rgba(0, 0, 0, 0.5); color: white; border: none; cursor: pointer; z-index: 10; } .gallery-nav { top: 50%; transform: translateY(-50%); padding: 1rem,1rem; border-radius: 50%; } .gallery-expand { top: 1rem; right: 1rem; border-radius: 4px; } .prev { left: 1rem; } .next { right: 1rem; } .gallery-nav:hover, .gallery-expand:hover { background: rgba(0, 0, 0, 0.8); } .product-gallery:not(:has(.gallery-item + .gallery-item)) > .gallery-nav, .gallery-lightbox.single .gallery-nav { display: none; } .gallery-lightbox { width: 100vw; height: 100vh; max-width: none; max-height: none; margin: 0; padding: 0; border: none; background: rgba(0, 0, 0, 0.9); } .gallery-lightbox[open] { display: flex; align-items: center; justify-content: center; } .gallery-lightbox img { max-width: calc(100% - 8rem); max-height: 90vh; object-fit: contain; } .lightbox-close { position: absolute; top: 1rem; right: 1rem; background: none; border: none; color: white; font-size: 2rem; line-height: 1; cursor: pointer; } html:has(.gallery-lightbox[open]) { overflow: hidden; } </style> <script> let lightboxGallery = null; function moveSlide(direction, el) { const gallery = el.closest('.product-gallery'); const slides = gallery.querySelectorAll('.gallery-item'); const index = ((+gallery.dataset.index || 0) + direction + slides.length) % slides.length; gallery.dataset.index = index; gallery.querySelector('.gallery-container').style.transform = `translateX(-${index * 100}%)`; return slides[index].querySelector('img'); } function lightboxMove(direction) { const img = moveSlide(direction, lightboxGallery); const lbImg = document.querySelector('#gallery-lightbox img'); lbImg.src = img.src; lbImg.alt = img.alt; } function openGalleryLightbox(el) { lightboxGallery = el.closest('.product-gallery'); const lb = document.getElementById('gallery-lightbox'); lb.classList.toggle('single', lightboxGallery.querySelectorAll('.gallery-item').length < 2); lightboxMove(0); lb.showModal(); } document.addEventListener('keydown', (e) => { if (!document.getElementById('gallery-lightbox').open) return; if (e.key === 'ArrowLeft') lightboxMove(-1); if (e.key === 'ArrowRight') lightboxMove(1); }); </script> <h2 id="features-specifications-and-manuals">Features, Specifications, and Manuals</h2> <div class="tabs"> <div class="tab-headers"> </div> <div class="tab-contents"> <div class="tab-header"> <div class="tab f3 lh-copy">Features</div> </div> <div class="tab-content"> <ul> <li>All-copper toroidal transformer (70V models)</li> <li>Direct burial, compression bandpass subwoofer design</li> <li>Marine grade</li> <li>Available in a selection of standard or custom colors</li> <li>TAA Compliant</li> </ul> </div> <div class="tab-header"> <div class="tab f3 lh-copy">Specifications</div> </div> <div class="tab-content"> <table> <thead> <tr> <th>Specification</th> <th>Details</th> </tr> </thead> <tbody> <tr> <td><strong>SKU</strong></td> <td>ST21</td> </tr> <tr> <td><strong>Speaker Woofer</strong></td> <td>(1) 21&quot; (534mm) Aluminum</td> </tr> <tr> <td><strong>Frequency Response (+/- 3db)</strong></td> <td>18Hz - 120Hz</td> </tr> <tr> <td><strong>Sensitivity</strong></td> <td>91dB (2.83V/1m)</td> </tr> <tr> <td><strong>Enclosure</strong></td> <td>Aluminum</td> </tr> <tr> <td><strong>Nominal Impedance (Ohms)</strong></td> <td>4 ohms</td> </tr> <tr> <td><strong>Dimensions (WxHxD)</strong></td> <td>24.0&quot; x 24.0&quot; x 24.0&quot; (609.6mm x 609.6mm x 609.6mm)</td> </tr> </tbody> </table> </div> <div class="tab-header"> <div class="tab f3 lh-copy">Manuals and Documents</div> </div> <div class="tab-content"> <ul> <li><a href="https://images.salsify.com/images/sdsyrcxbmke52ct3oaim/ST21_JAMES_Data_Sheet.pdf">ST21 Data Sheet (PDF)</a> - Sales &amp; Data Sheets</li> <li><a href="https://images.salsify.com/images/vsmcbjpqmbkpt3tlc1pk/James%20Standard%20Colors%20and%20Upgraded%20Finishes.pdf">James Standard Colors and Upgraded Finishes (PDF)</a> - Sales &amp; Data Sheets</li> <li><a href="https://images.salsify.com/images/e1ctl9pfnrwa3nesozm4/Tech%20Note_JAMES_Landscape_System_Output_Bass.pdf">Tech Note Landscape System Output Bass (PDF)</a> - Sales &amp; Data Sheets</li> <li><a href="https://images.salsify.com/images/asll08hw7ezi2emxnxdp/Subterranean_JAMES_Installation_Guide.pdf">Subterranean Installation Guide (PDF)</a> - Instructions</li> <li><a href="https://images.salsify.com/images/aboxtzvdj9ctm11cqfr7/ST21_JAMES_cad_file.pdf">ST21 cad file (PDF)</a> - Drawings &amp; Images</li> <li><a href="https://images.salsify.com/raw/upload/s--wDB4Q2ER--/fl_attachment:ST21_JAMES_cad_file.DWG/sxanycoayoroqolrgpjv.dwg">ST21 cad file (DWG)</a> - Drawings &amp; Images</li> <li><a href="https://images.salsify.com/raw/upload/s--YnTW-qKy--/fl_attachment:Sonance%20DSP%20Speaker%20Presets_Sonance%20DSP_SpeakerPresets_2026.08.03.zip/txnxbszkftdgp1jooye8.zip">Sonance DSP Speaker Presets Sonance DSP SpeakerPresets 2026.08.03 (ZIP)</a> - Ease Files &amp; Speaker Presets</li> <li><a href="https://images.salsify.com/raw/upload/s--pPozyYUs--/fl_attachment:PowerZone%20Connect%20Speaker%20Preset%20Library_BlazebySonance_SpeakerPresets_20260819.1.zip/enqoedirr9wsenthf3fb.zip">PowerZone Connect Speaker Preset Library BlazebySonance SpeakerPresets 20260819.1 (ZIP)</a> - Ease Files &amp; Speaker Presets</li> <li><a href="https://images.salsify.com/raw/upload/s--fv0LlTU4--/fl_attachment:PowerZone%20Connect%20PRO%20Speaker%20Preset%20Library_SONANCE_SpeakerPresets_20260819.1.zip/m56irzdvp7raeamxenqx.zip">PowerZone Connect PRO Speaker Preset Library SpeakerPresets 20260819.1 (ZIP)</a> - Ease Files &amp; Speaker Presets</li> <li><a href="https://sonance.com/products/st21">James ST21 Product Page</a> - Official manufacturer product information, documentation, and support resources.</li> </ul> </div> </div> </div> <script> document.addEventListener('DOMContentLoaded', function () { const tabsContainers = document.querySelectorAll('.tabs'); tabsContainers.forEach(function(container) { const tabs = container.querySelectorAll('.tab-header'); const tabContents = container.querySelectorAll('.tab-content'); tabs.forEach(function(tab, index) { tab.addEventListener('click', function() { tabs.forEach(t => t.classList.remove('active')); tabContents.forEach(content => content.classList.remove('active')); 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